Documentation/Source/eric5.Plugins.CheckerPlugins.CodeStyleChecker.pep8.html

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<h1>eric5.Plugins.CheckerPlugins.CodeStyleChecker.pep8</h1>

<h3>Global Attributes</h3>
<table>
<tr><td>ARITHMETIC_OP</td></tr><tr><td>BENCHMARK_KEYS</td></tr><tr><td>COMMENT_WITH_NL</td></tr><tr><td>COMPARE_SINGLETON_REGEX</td></tr><tr><td>COMPARE_TYPE_REGEX</td></tr><tr><td>DEFAULT_EXCLUDE</td></tr><tr><td>DEFAULT_IGNORE</td></tr><tr><td>DOCSTRING_REGEX</td></tr><tr><td>ERRORCODE_REGEX</td></tr><tr><td>EXTRANEOUS_WHITESPACE_REGEX</td></tr><tr><td>HUNK_REGEX</td></tr><tr><td>INDENT_REGEX</td></tr><tr><td>KEYWORDS</td></tr><tr><td>KEYWORD_REGEX</td></tr><tr><td>LAMBDA_REGEX</td></tr><tr><td>MAX_LINE_LENGTH</td></tr><tr><td>OPERATOR_REGEX</td></tr><tr><td>PROJECT_CONFIG</td></tr><tr><td>PyCF_ONLY_AST</td></tr><tr><td>RAISE_COMMA_REGEX</td></tr><tr><td>REPORT_FORMAT</td></tr><tr><td>RERAISE_COMMA_REGEX</td></tr><tr><td>SINGLETONS</td></tr><tr><td>SKIP_TOKENS</td></tr><tr><td>TESTSUITE_PATH</td></tr><tr><td>UNARY_OPERATORS</td></tr><tr><td>WHITESPACE</td></tr><tr><td>WHITESPACE_AFTER_COMMA_REGEX</td></tr><tr><td>WS_NEEDED_OPERATORS</td></tr><tr><td>WS_OPTIONAL_OPERATORS</td></tr><tr><td>__version__</td></tr><tr><td>_checks</td></tr><tr><td>noqa</td></tr>
</table>
<h3>Classes</h3>
<table>
<tr>
<td><a href="#BaseReport">BaseReport</a></td>
<td>Collect the results of the checks.</td>
</tr><tr>
<td><a href="#Checker">Checker</a></td>
<td>Load a Python source file, tokenize it, check coding style.</td>
</tr><tr>
<td><a href="#DiffReport">DiffReport</a></td>
<td>Collect and print the results for the changed lines only.</td>
</tr><tr>
<td><a href="#FileReport">FileReport</a></td>
<td>Collect the results of the checks and print only the filenames.</td>
</tr><tr>
<td><a href="#StandardReport">StandardReport</a></td>
<td>Collect and print the results of the checks.</td>
</tr><tr>
<td><a href="#StyleGuide">StyleGuide</a></td>
<td>Initialize a PEP-8 instance with few options.</td>
</tr>
</table>
<h3>Functions</h3>
<table>
<tr>
<td><a href="#_add_check">_add_check</a></td>
<td></td>
</tr><tr>
<td><a href="#_main">_main</a></td>
<td>Parse options and run checks on Python source.</td>
</tr><tr>
<td><a href="#blank_lines">blank_lines</a></td>
<td>Separate top-level function and class definitions with two blank lines.</td>
</tr><tr>
<td><a href="#comparison_to_singleton">comparison_to_singleton</a></td>
<td>Comparisons to singletons like None should always be done with "is" or "is not", never the equality operators.</td>
</tr><tr>
<td><a href="#comparison_type">comparison_type</a></td>
<td>Object type comparisons should always use isinstance() instead of comparing types directly.</td>
</tr><tr>
<td><a href="#compound_statements">compound_statements</a></td>
<td>Compound statements (multiple statements on the same line) are generally discouraged.</td>
</tr><tr>
<td><a href="#continued_indentation">continued_indentation</a></td>
<td>Continuation lines should align wrapped elements either vertically using Python's implicit line joining inside parentheses, brackets and braces, or using a hanging indent.</td>
</tr><tr>
<td><a href="#expand_indent">expand_indent</a></td>
<td>Return the amount of indentation.</td>
</tr><tr>
<td><a href="#explicit_line_join">explicit_line_join</a></td>
<td>Avoid explicit line join between brackets.</td>
</tr><tr>
<td><a href="#extraneous_whitespace">extraneous_whitespace</a></td>
<td>Avoid extraneous whitespace in the following situations:</td>
</tr><tr>
<td><a href="#filename_match">filename_match</a></td>
<td>Check if patterns contains a pattern that matches filename.</td>
</tr><tr>
<td><a href="#get_parser">get_parser</a></td>
<td></td>
</tr><tr>
<td><a href="#imports_on_separate_lines">imports_on_separate_lines</a></td>
<td>Imports should usually be on separate lines.</td>
</tr><tr>
<td><a href="#indentation">indentation</a></td>
<td>Use 4 spaces per indentation level.</td>
</tr><tr>
<td><a href="#init_checks_registry">init_checks_registry</a></td>
<td>Register all globally visible functions where the first argument name is 'physical_line' or 'logical_line'.</td>
</tr><tr>
<td><a href="#maximum_line_length">maximum_line_length</a></td>
<td>Limit all lines to a maximum of 79 characters.</td>
</tr><tr>
<td><a href="#missing_newline">missing_newline</a></td>
<td>JCR: The last line should have a newline.</td>
</tr><tr>
<td><a href="#missing_whitespace">missing_whitespace</a></td>
<td>JCR: Each comma, semicolon or colon should be followed by whitespace.</td>
</tr><tr>
<td><a href="#missing_whitespace_around_operator">missing_whitespace_around_operator</a></td>
<td>- Always surround these binary operators with a single space on either side: assignment (=), augmented assignment (+=, -= etc.), comparisons (==, <, >, !=, <>, <=, >=, in, not in, is, is not), Booleans (and, or, not).</td>
</tr><tr>
<td><a href="#mute_string">mute_string</a></td>
<td>Replace contents with 'xxx' to prevent syntax matching.</td>
</tr><tr>
<td><a href="#parse_udiff">parse_udiff</a></td>
<td>Return a dictionary of matching lines.</td>
</tr><tr>
<td><a href="#process_options">process_options</a></td>
<td>Process options passed either via arglist or via command line args.</td>
</tr><tr>
<td><a href="#python_3000_backticks">python_3000_backticks</a></td>
<td>Backticks are removed in Python 3.</td>
</tr><tr>
<td><a href="#python_3000_has_key">python_3000_has_key</a></td>
<td>The {}.has_key() method is removed in the Python 3.</td>
</tr><tr>
<td><a href="#python_3000_not_equal">python_3000_not_equal</a></td>
<td>!= can also be written <>, but this is an obsolete usage kept for backwards compatibility only.</td>
</tr><tr>
<td><a href="#python_3000_raise_comma">python_3000_raise_comma</a></td>
<td>When raising an exception, use "raise ValueError('message')" instead of the older form "raise ValueError, 'message'".</td>
</tr><tr>
<td><a href="#read_config">read_config</a></td>
<td>Read both user configuration and local configuration.</td>
</tr><tr>
<td><a href="#readlines">readlines</a></td>
<td></td>
</tr><tr>
<td><a href="#readlines_1">readlines</a></td>
<td></td>
</tr><tr>
<td><a href="#register_check">register_check</a></td>
<td>Register a new check object.</td>
</tr><tr>
<td><a href="#stdin_get_value">stdin_get_value</a></td>
<td></td>
</tr><tr>
<td><a href="#tabs_obsolete">tabs_obsolete</a></td>
<td>For new projects, spaces-only are strongly recommended over tabs.</td>
</tr><tr>
<td><a href="#tabs_or_spaces">tabs_or_spaces</a></td>
<td>Never mix tabs and spaces.</td>
</tr><tr>
<td><a href="#trailing_blank_lines">trailing_blank_lines</a></td>
<td>JCR: Trailing blank lines are superfluous.</td>
</tr><tr>
<td><a href="#trailing_whitespace">trailing_whitespace</a></td>
<td>JCR: Trailing whitespace is superfluous.</td>
</tr><tr>
<td><a href="#whitespace_around_comma">whitespace_around_comma</a></td>
<td>Avoid extraneous whitespace in the following situations:</td>
</tr><tr>
<td><a href="#whitespace_around_keywords">whitespace_around_keywords</a></td>
<td>Avoid extraneous whitespace around keywords.</td>
</tr><tr>
<td><a href="#whitespace_around_named_parameter_equals">whitespace_around_named_parameter_equals</a></td>
<td>Don't use spaces around the '=' sign when used to indicate a keyword argument or a default parameter value.</td>
</tr><tr>
<td><a href="#whitespace_around_operator">whitespace_around_operator</a></td>
<td>Avoid extraneous whitespace in the following situations:</td>
</tr><tr>
<td><a href="#whitespace_before_inline_comment">whitespace_before_inline_comment</a></td>
<td>Separate inline comments by at least two spaces.</td>
</tr><tr>
<td><a href="#whitespace_before_parameters">whitespace_before_parameters</a></td>
<td>Avoid extraneous whitespace in the following situations:</td>
</tr>
</table>
<hr /><hr />
<a NAME="BaseReport" ID="BaseReport"></a>
<h2>BaseReport</h2>
<p>
Collect the results of the checks.
</p>
<h3>Derived from</h3>
object
<h3>Class Attributes</h3>
<table>
<tr><td>print_filename</td></tr>
</table>
<h3>Class Methods</h3>
<table>
<tr><td>None</td></tr>
</table>
<h3>Methods</h3>
<table>
<tr>
<td><a href="#BaseReport.__init__">BaseReport</a></td>
<td></td>
</tr><tr>
<td><a href="#BaseReport.error">error</a></td>
<td>Report an error, according to options.</td>
</tr><tr>
<td><a href="#BaseReport.error_args">error_args</a></td>
<td>Report an error, according to options.</td>
</tr><tr>
<td><a href="#BaseReport.get_count">get_count</a></td>
<td>Return the total count of errors and warnings.</td>
</tr><tr>
<td><a href="#BaseReport.get_file_results">get_file_results</a></td>
<td>Return the count of errors and warnings for this file.</td>
</tr><tr>
<td><a href="#BaseReport.get_statistics">get_statistics</a></td>
<td>Get statistics for message codes that start with the prefix.</td>
</tr><tr>
<td><a href="#BaseReport.increment_logical_line">increment_logical_line</a></td>
<td>Signal a new logical line.</td>
</tr><tr>
<td><a href="#BaseReport.init_file">init_file</a></td>
<td>Signal a new file.</td>
</tr><tr>
<td><a href="#BaseReport.print_benchmark">print_benchmark</a></td>
<td>Print benchmark numbers.</td>
</tr><tr>
<td><a href="#BaseReport.print_statistics">print_statistics</a></td>
<td>Print overall statistics (number of errors and warnings).</td>
</tr><tr>
<td><a href="#BaseReport.start">start</a></td>
<td>Start the timer.</td>
</tr><tr>
<td><a href="#BaseReport.stop">stop</a></td>
<td>Stop the timer.</td>
</tr>
</table>
<h3>Static Methods</h3>
<table>
<tr><td>None</td></tr>
</table>
<a NAME="BaseReport.__init__" ID="BaseReport.__init__"></a>
<h4>BaseReport (Constructor)</h4>
<b>BaseReport</b>(<i>options</i>)
<a NAME="BaseReport.error" ID="BaseReport.error"></a>
<h4>BaseReport.error</h4>
<b>error</b>(<i>line_number, offset, text, check</i>)
<p>
Report an error, according to options.
</p><a NAME="BaseReport.error_args" ID="BaseReport.error_args"></a>
<h4>BaseReport.error_args</h4>
<b>error_args</b>(<i>line_number, offset, code, check, *args</i>)
<p>
Report an error, according to options.
</p><a NAME="BaseReport.get_count" ID="BaseReport.get_count"></a>
<h4>BaseReport.get_count</h4>
<b>get_count</b>(<i>prefix=''</i>)
<p>
Return the total count of errors and warnings.
</p><a NAME="BaseReport.get_file_results" ID="BaseReport.get_file_results"></a>
<h4>BaseReport.get_file_results</h4>
<b>get_file_results</b>(<i></i>)
<p>
Return the count of errors and warnings for this file.
</p><a NAME="BaseReport.get_statistics" ID="BaseReport.get_statistics"></a>
<h4>BaseReport.get_statistics</h4>
<b>get_statistics</b>(<i>prefix=''</i>)
<p>
        Get statistics for message codes that start with the prefix.
</p><p>
        prefix='' matches all errors and warnings
        prefix='E' matches all errors
        prefix='W' matches all warnings
        prefix='E4' matches all errors that have to do with imports
</p><a NAME="BaseReport.increment_logical_line" ID="BaseReport.increment_logical_line"></a>
<h4>BaseReport.increment_logical_line</h4>
<b>increment_logical_line</b>(<i></i>)
<p>
Signal a new logical line.
</p><a NAME="BaseReport.init_file" ID="BaseReport.init_file"></a>
<h4>BaseReport.init_file</h4>
<b>init_file</b>(<i>filename, lines, expected, line_offset</i>)
<p>
Signal a new file.
</p><a NAME="BaseReport.print_benchmark" ID="BaseReport.print_benchmark"></a>
<h4>BaseReport.print_benchmark</h4>
<b>print_benchmark</b>(<i></i>)
<p>
Print benchmark numbers.
</p><a NAME="BaseReport.print_statistics" ID="BaseReport.print_statistics"></a>
<h4>BaseReport.print_statistics</h4>
<b>print_statistics</b>(<i>prefix=''</i>)
<p>
Print overall statistics (number of errors and warnings).
</p><a NAME="BaseReport.start" ID="BaseReport.start"></a>
<h4>BaseReport.start</h4>
<b>start</b>(<i></i>)
<p>
Start the timer.
</p><a NAME="BaseReport.stop" ID="BaseReport.stop"></a>
<h4>BaseReport.stop</h4>
<b>stop</b>(<i></i>)
<p>
Stop the timer.
</p>
<div align="right"><a href="#top">Up</a></div>
<hr /><hr />
<a NAME="Checker" ID="Checker"></a>
<h2>Checker</h2>
<p>
    Load a Python source file, tokenize it, check coding style.
</p>
<h3>Derived from</h3>
object
<h3>Class Attributes</h3>
<table>
<tr><td>None</td></tr>
</table>
<h3>Class Methods</h3>
<table>
<tr><td>None</td></tr>
</table>
<h3>Methods</h3>
<table>
<tr>
<td><a href="#Checker.__init__">Checker</a></td>
<td></td>
</tr><tr>
<td><a href="#Checker.build_tokens_line">build_tokens_line</a></td>
<td>Build a logical line from tokens.</td>
</tr><tr>
<td><a href="#Checker.check_all">check_all</a></td>
<td>Run all checks on the input file.</td>
</tr><tr>
<td><a href="#Checker.check_ast">check_ast</a></td>
<td></td>
</tr><tr>
<td><a href="#Checker.check_logical">check_logical</a></td>
<td>Build a line from tokens and run all logical checks on it.</td>
</tr><tr>
<td><a href="#Checker.check_physical">check_physical</a></td>
<td>Run all physical checks on a raw input line.</td>
</tr><tr>
<td><a href="#Checker.generate_tokens">generate_tokens</a></td>
<td></td>
</tr><tr>
<td><a href="#Checker.readline">readline</a></td>
<td>Get the next line from the input buffer.</td>
</tr><tr>
<td><a href="#Checker.readline_check_physical">readline_check_physical</a></td>
<td>Check and return the next physical line.</td>
</tr><tr>
<td><a href="#Checker.report_invalid_syntax">report_invalid_syntax</a></td>
<td></td>
</tr><tr>
<td><a href="#Checker.run_check">run_check</a></td>
<td>Run a check plugin.</td>
</tr>
</table>
<h3>Static Methods</h3>
<table>
<tr><td>None</td></tr>
</table>
<a NAME="Checker.__init__" ID="Checker.__init__"></a>
<h4>Checker (Constructor)</h4>
<b>Checker</b>(<i>filename=None, lines=None, options=None, report=None, **kwargs</i>)
<a NAME="Checker.build_tokens_line" ID="Checker.build_tokens_line"></a>
<h4>Checker.build_tokens_line</h4>
<b>build_tokens_line</b>(<i></i>)
<p>
        Build a logical line from tokens.
</p><a NAME="Checker.check_all" ID="Checker.check_all"></a>
<h4>Checker.check_all</h4>
<b>check_all</b>(<i>expected=None, line_offset=0</i>)
<p>
        Run all checks on the input file.
</p><a NAME="Checker.check_ast" ID="Checker.check_ast"></a>
<h4>Checker.check_ast</h4>
<b>check_ast</b>(<i></i>)
<a NAME="Checker.check_logical" ID="Checker.check_logical"></a>
<h4>Checker.check_logical</h4>
<b>check_logical</b>(<i></i>)
<p>
        Build a line from tokens and run all logical checks on it.
</p><a NAME="Checker.check_physical" ID="Checker.check_physical"></a>
<h4>Checker.check_physical</h4>
<b>check_physical</b>(<i>line</i>)
<p>
        Run all physical checks on a raw input line.
</p><a NAME="Checker.generate_tokens" ID="Checker.generate_tokens"></a>
<h4>Checker.generate_tokens</h4>
<b>generate_tokens</b>(<i></i>)
<a NAME="Checker.readline" ID="Checker.readline"></a>
<h4>Checker.readline</h4>
<b>readline</b>(<i></i>)
<p>
        Get the next line from the input buffer.
</p><a NAME="Checker.readline_check_physical" ID="Checker.readline_check_physical"></a>
<h4>Checker.readline_check_physical</h4>
<b>readline_check_physical</b>(<i></i>)
<p>
        Check and return the next physical line. This method can be
        used to feed tokenize.generate_tokens.
</p><a NAME="Checker.report_invalid_syntax" ID="Checker.report_invalid_syntax"></a>
<h4>Checker.report_invalid_syntax</h4>
<b>report_invalid_syntax</b>(<i></i>)
<a NAME="Checker.run_check" ID="Checker.run_check"></a>
<h4>Checker.run_check</h4>
<b>run_check</b>(<i>check, argument_names</i>)
<p>
        Run a check plugin.
</p>
<div align="right"><a href="#top">Up</a></div>
<hr /><hr />
<a NAME="DiffReport" ID="DiffReport"></a>
<h2>DiffReport</h2>
<p>
Collect and print the results for the changed lines only.
</p>
<h3>Derived from</h3>
StandardReport
<h3>Class Attributes</h3>
<table>
<tr><td>None</td></tr>
</table>
<h3>Class Methods</h3>
<table>
<tr><td>None</td></tr>
</table>
<h3>Methods</h3>
<table>
<tr>
<td><a href="#DiffReport.__init__">DiffReport</a></td>
<td></td>
</tr><tr>
<td><a href="#DiffReport.error">error</a></td>
<td></td>
</tr>
</table>
<h3>Static Methods</h3>
<table>
<tr><td>None</td></tr>
</table>
<a NAME="DiffReport.__init__" ID="DiffReport.__init__"></a>
<h4>DiffReport (Constructor)</h4>
<b>DiffReport</b>(<i>options</i>)
<a NAME="DiffReport.error" ID="DiffReport.error"></a>
<h4>DiffReport.error</h4>
<b>error</b>(<i>line_number, offset, text, check</i>)

<div align="right"><a href="#top">Up</a></div>
<hr /><hr />
<a NAME="FileReport" ID="FileReport"></a>
<h2>FileReport</h2>
<p>
Collect the results of the checks and print only the filenames.
</p>
<h3>Derived from</h3>
BaseReport
<h3>Class Attributes</h3>
<table>
<tr><td>print_filename</td></tr>
</table>
<h3>Class Methods</h3>
<table>
<tr><td>None</td></tr>
</table>
<h3>Methods</h3>
<table>
<tr><td>None</td></tr>
</table>
<h3>Static Methods</h3>
<table>
<tr><td>None</td></tr>
</table>

<div align="right"><a href="#top">Up</a></div>
<hr /><hr />
<a NAME="StandardReport" ID="StandardReport"></a>
<h2>StandardReport</h2>
<p>
Collect and print the results of the checks.
</p>
<h3>Derived from</h3>
BaseReport
<h3>Class Attributes</h3>
<table>
<tr><td>None</td></tr>
</table>
<h3>Class Methods</h3>
<table>
<tr><td>None</td></tr>
</table>
<h3>Methods</h3>
<table>
<tr>
<td><a href="#StandardReport.__init__">StandardReport</a></td>
<td></td>
</tr><tr>
<td><a href="#StandardReport.error">error</a></td>
<td>Report an error, according to options.</td>
</tr><tr>
<td><a href="#StandardReport.error_args">error_args</a></td>
<td>Report an error, according to options.</td>
</tr><tr>
<td><a href="#StandardReport.get_file_results">get_file_results</a></td>
<td>Print the result and return the overall count for this file.</td>
</tr><tr>
<td><a href="#StandardReport.init_file">init_file</a></td>
<td>Signal a new file.</td>
</tr>
</table>
<h3>Static Methods</h3>
<table>
<tr><td>None</td></tr>
</table>
<a NAME="StandardReport.__init__" ID="StandardReport.__init__"></a>
<h4>StandardReport (Constructor)</h4>
<b>StandardReport</b>(<i>options</i>)
<a NAME="StandardReport.error" ID="StandardReport.error"></a>
<h4>StandardReport.error</h4>
<b>error</b>(<i>line_number, offset, text, check</i>)
<p>
Report an error, according to options.
</p><a NAME="StandardReport.error_args" ID="StandardReport.error_args"></a>
<h4>StandardReport.error_args</h4>
<b>error_args</b>(<i>line_number, offset, code, check, *args</i>)
<p>
Report an error, according to options.
</p><a NAME="StandardReport.get_file_results" ID="StandardReport.get_file_results"></a>
<h4>StandardReport.get_file_results</h4>
<b>get_file_results</b>(<i></i>)
<p>
Print the result and return the overall count for this file.
</p><a NAME="StandardReport.init_file" ID="StandardReport.init_file"></a>
<h4>StandardReport.init_file</h4>
<b>init_file</b>(<i>filename, lines, expected, line_offset</i>)
<p>
Signal a new file.
</p>
<div align="right"><a href="#top">Up</a></div>
<hr /><hr />
<a NAME="StyleGuide" ID="StyleGuide"></a>
<h2>StyleGuide</h2>
<p>
Initialize a PEP-8 instance with few options.
</p>
<h3>Derived from</h3>
object
<h3>Class Attributes</h3>
<table>
<tr><td>None</td></tr>
</table>
<h3>Class Methods</h3>
<table>
<tr><td>None</td></tr>
</table>
<h3>Methods</h3>
<table>
<tr>
<td><a href="#StyleGuide.__init__">StyleGuide</a></td>
<td></td>
</tr><tr>
<td><a href="#StyleGuide.check_files">check_files</a></td>
<td>Run all checks on the paths.</td>
</tr><tr>
<td><a href="#StyleGuide.excluded">excluded</a></td>
<td>Check if options.exclude contains a pattern that matches filename.</td>
</tr><tr>
<td><a href="#StyleGuide.get_checks">get_checks</a></td>
<td>Find all globally visible functions where the first argument name starts with argument_name and which contain selected tests.</td>
</tr><tr>
<td><a href="#StyleGuide.ignore_code">ignore_code</a></td>
<td>Check if the error code should be ignored.</td>
</tr><tr>
<td><a href="#StyleGuide.init_report">init_report</a></td>
<td>Initialize the report instance.</td>
</tr><tr>
<td><a href="#StyleGuide.input_dir">input_dir</a></td>
<td>Check all files in this directory and all subdirectories.</td>
</tr><tr>
<td><a href="#StyleGuide.input_file">input_file</a></td>
<td>Run all checks on a Python source file.</td>
</tr>
</table>
<h3>Static Methods</h3>
<table>
<tr><td>None</td></tr>
</table>
<a NAME="StyleGuide.__init__" ID="StyleGuide.__init__"></a>
<h4>StyleGuide (Constructor)</h4>
<b>StyleGuide</b>(<i>*args, **kwargs</i>)
<a NAME="StyleGuide.check_files" ID="StyleGuide.check_files"></a>
<h4>StyleGuide.check_files</h4>
<b>check_files</b>(<i>paths=None</i>)
<p>
Run all checks on the paths.
</p><a NAME="StyleGuide.excluded" ID="StyleGuide.excluded"></a>
<h4>StyleGuide.excluded</h4>
<b>excluded</b>(<i>filename, parent=None</i>)
<p>
        Check if options.exclude contains a pattern that matches filename.
</p><a NAME="StyleGuide.get_checks" ID="StyleGuide.get_checks"></a>
<h4>StyleGuide.get_checks</h4>
<b>get_checks</b>(<i>argument_name</i>)
<p>
        Find all globally visible functions where the first argument name
        starts with argument_name and which contain selected tests.
</p><a NAME="StyleGuide.ignore_code" ID="StyleGuide.ignore_code"></a>
<h4>StyleGuide.ignore_code</h4>
<b>ignore_code</b>(<i>code</i>)
<p>
        Check if the error code should be ignored.
</p><p>
        If 'options.select' contains a prefix of the error code,
        return False.  Else, if 'options.ignore' contains a prefix of
        the error code, return True.
</p><a NAME="StyleGuide.init_report" ID="StyleGuide.init_report"></a>
<h4>StyleGuide.init_report</h4>
<b>init_report</b>(<i>reporter=None</i>)
<p>
Initialize the report instance.
</p><a NAME="StyleGuide.input_dir" ID="StyleGuide.input_dir"></a>
<h4>StyleGuide.input_dir</h4>
<b>input_dir</b>(<i>dirname</i>)
<p>
Check all files in this directory and all subdirectories.
</p><a NAME="StyleGuide.input_file" ID="StyleGuide.input_file"></a>
<h4>StyleGuide.input_file</h4>
<b>input_file</b>(<i>filename, lines=None, expected=None, line_offset=0</i>)
<p>
Run all checks on a Python source file.
</p>
<div align="right"><a href="#top">Up</a></div>
<hr /><hr />
<a NAME="_add_check" ID="_add_check"></a>
<h2>_add_check</h2>
<b>_add_check</b>(<i>check, kind, codes, args</i>)

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<hr /><hr />
<a NAME="_main" ID="_main"></a>
<h2>_main</h2>
<b>_main</b>(<i></i>)
<p>
Parse options and run checks on Python source.
</p>
<div align="right"><a href="#top">Up</a></div>
<hr /><hr />
<a NAME="blank_lines" ID="blank_lines"></a>
<h2>blank_lines</h2>
<b>blank_lines</b>(<i>logical_line, blank_lines, indent_level, line_number, previous_logical, previous_indent_level</i>)
<p>
    Separate top-level function and class definitions with two blank lines.
</p><p>
    Method definitions inside a class are separated by a single blank line.
</p><p>
    Extra blank lines may be used (sparingly) to separate groups of related
    functions.  Blank lines may be omitted between a bunch of related
    one-liners (e.g. a set of dummy implementations).
</p><p>
    Use blank lines in functions, sparingly, to indicate logical sections.
</p><p>
    Okay: def a():\n    pass\n\n\ndef b():\n    pass
    Okay: def a():\n    pass\n\n\n# Foo\n# Bar\n\ndef b():\n    pass
</p><p>
    E301: class Foo:\n    b = 0\n    def bar():\n        pass
    E302: def a():\n    pass\n\ndef b(n):\n    pass
    E303: def a():\n    pass\n\n\n\ndef b(n):\n    pass
    E303: def a():\n\n\n\n    pass
    E304: @decorator\n\ndef a():\n    pass
</p>
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<hr /><hr />
<a NAME="comparison_to_singleton" ID="comparison_to_singleton"></a>
<h2>comparison_to_singleton</h2>
<b>comparison_to_singleton</b>(<i>logical_line, noqa</i>)
<p>
    Comparisons to singletons like None should always be done
    with "is" or "is not", never the equality operators.
</p><p>
    Okay: if arg is not None:
    E711: if arg != None:
    E712: if arg == True:
</p><p>
    Also, beware of writing if x when you really mean if x is not None --
    e.g. when testing whether a variable or argument that defaults to None was
    set to some other value.  The other value might have a type (such as a
    container) that could be false in a boolean context!
</p>
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<hr /><hr />
<a NAME="comparison_type" ID="comparison_type"></a>
<h2>comparison_type</h2>
<b>comparison_type</b>(<i>logical_line</i>)
<p>
    Object type comparisons should always use isinstance() instead of
    comparing types directly.
</p><p>
    Okay: if isinstance(obj, int):
    E721: if type(obj) is type(1):
</p><p>
    When checking if an object is a string, keep in mind that it might be a
    unicode string too! In Python 2.3, str and unicode have a common base
    class, basestring, so you can do:
</p><p>
    Okay: if isinstance(obj, basestring):
    Okay: if type(a1) is type(b1):
</p>
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<hr /><hr />
<a NAME="compound_statements" ID="compound_statements"></a>
<h2>compound_statements</h2>
<b>compound_statements</b>(<i>logical_line</i>)
<p>
    Compound statements (multiple statements on the same line) are
    generally discouraged.
</p><p>
    While sometimes it's okay to put an if/for/while with a small body
    on the same line, never do this for multi-clause statements. Also
    avoid folding such long lines!
</p><p>
    Okay: if foo == 'blah':\n    do_blah_thing()
    Okay: do_one()
    Okay: do_two()
    Okay: do_three()
</p><p>
    E701: if foo == 'blah': do_blah_thing()
    E701: for x in lst: total += x
    E701: while t < 10: t = delay()
    E701: if foo == 'blah': do_blah_thing()
    E701: else: do_non_blah_thing()
    E701: try: something()
    E701: finally: cleanup()
    E701: if foo == 'blah': one(); two(); three()
</p><p>
    E702: do_one(); do_two(); do_three()
    E703: do_four();  # useless semicolon
</p>
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<hr /><hr />
<a NAME="continued_indentation" ID="continued_indentation"></a>
<h2>continued_indentation</h2>
<b>continued_indentation</b>(<i>logical_line, tokens, indent_level, hang_closing, noqa, verbose</i>)
<p>
    Continuation lines should align wrapped elements either vertically using
    Python's implicit line joining inside parentheses, brackets and braces, or
    using a hanging indent.
</p><p>
    When using a hanging indent the following considerations should be applied:
</p><p>
    - there should be no arguments on the first line, and
</p><p>
    - further indentation should be used to clearly distinguish itself as a
      continuation line.
</p><p>
    Okay: a = (\n)
    E123: a = (\n    )
</p><p>
    Okay: a = (\n    42)
    E121: a = (\n   42)
    E122: a = (\n42)
    E123: a = (\n    42\n    )
    E124: a = (24,\n     42\n)
    E125: if (a or\n    b):\n    pass
    E126: a = (\n        42)
    E127: a = (24,\n      42)
    E128: a = (24,\n    42)
</p>
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<hr /><hr />
<a NAME="expand_indent" ID="expand_indent"></a>
<h2>expand_indent</h2>
<b>expand_indent</b>(<i>line</i>)
<p>
    Return the amount of indentation.
    Tabs are expanded to the next multiple of 8.
</p><p>
    >>> expand_indent('    ')
    4
    >>> expand_indent('\t')
    8
    >>> expand_indent('    \t')
    8
    >>> expand_indent('       \t')
    8
    >>> expand_indent('        \t')
    16
</p>
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<hr /><hr />
<a NAME="explicit_line_join" ID="explicit_line_join"></a>
<h2>explicit_line_join</h2>
<b>explicit_line_join</b>(<i>logical_line, tokens</i>)
<p>
    Avoid explicit line join between brackets.
</p><p>
    The preferred way of wrapping long lines is by using Python's implied line
    continuation inside parentheses, brackets and braces.  Long lines can be
    broken over multiple lines by wrapping expressions in parentheses.  These
    should be used in preference to using a backslash for line continuation.
</p><p>
    E502: aaa = [123, \\n       123]
    E502: aaa = ("bbb " \\n       "ccc")
</p><p>
    Okay: aaa = [123,\n       123]
    Okay: aaa = ("bbb "\n       "ccc")
    Okay: aaa = "bbb " \\n    "ccc"
</p>
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<hr /><hr />
<a NAME="extraneous_whitespace" ID="extraneous_whitespace"></a>
<h2>extraneous_whitespace</h2>
<b>extraneous_whitespace</b>(<i>logical_line</i>)
<p>
    Avoid extraneous whitespace in the following situations:
</p><p>
    - Immediately inside parentheses, brackets or braces.
</p><p>
    - Immediately before a comma, semicolon, or colon.
</p><p>
    Okay: spam(ham[1], {eggs: 2})
    E201: spam( ham[1], {eggs: 2})
    E201: spam(ham[ 1], {eggs: 2})
    E201: spam(ham[1], { eggs: 2})
    E202: spam(ham[1], {eggs: 2} )
    E202: spam(ham[1 ], {eggs: 2})
    E202: spam(ham[1], {eggs: 2 })
</p><p>
    E203: if x == 4: print x, y; x, y = y , x
    E203: if x == 4: print x, y ; x, y = y, x
    E203: if x == 4 : print x, y; x, y = y, x
</p>
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<hr /><hr />
<a NAME="filename_match" ID="filename_match"></a>
<h2>filename_match</h2>
<b>filename_match</b>(<i>filename, patterns, default=True</i>)
<p>
    Check if patterns contains a pattern that matches filename.
    If patterns is unspecified, this always returns True.
</p>
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<hr /><hr />
<a NAME="get_parser" ID="get_parser"></a>
<h2>get_parser</h2>
<b>get_parser</b>(<i>prog='pep8', version=__version__</i>)

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<hr /><hr />
<a NAME="imports_on_separate_lines" ID="imports_on_separate_lines"></a>
<h2>imports_on_separate_lines</h2>
<b>imports_on_separate_lines</b>(<i>logical_line</i>)
<p>
    Imports should usually be on separate lines.
</p><p>
    Okay: import os\nimport sys
    E401: import sys, os
</p><p>
    Okay: from subprocess import Popen, PIPE
    Okay: from myclas import MyClass
    Okay: from foo.bar.yourclass import YourClass
    Okay: import myclass
    Okay: import foo.bar.yourclass
</p>
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<hr /><hr />
<a NAME="indentation" ID="indentation"></a>
<h2>indentation</h2>
<b>indentation</b>(<i>logical_line, previous_logical, indent_char, indent_level, previous_indent_level</i>)
<p>
    Use 4 spaces per indentation level.
</p><p>
    For really old code that you don't want to mess up, you can continue to
    use 8-space tabs.
</p><p>
    Okay: a = 1
    Okay: if a == 0:\n    a = 1
    E111:   a = 1
</p><p>
    Okay: for item in items:\n    pass
    E112: for item in items:\npass
</p><p>
    Okay: a = 1\nb = 2
    E113: a = 1\n    b = 2
</p>
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<hr /><hr />
<a NAME="init_checks_registry" ID="init_checks_registry"></a>
<h2>init_checks_registry</h2>
<b>init_checks_registry</b>(<i></i>)
<p>
    Register all globally visible functions where the first argument name
    is 'physical_line' or 'logical_line'.
</p>
<div align="right"><a href="#top">Up</a></div>
<hr /><hr />
<a NAME="maximum_line_length" ID="maximum_line_length"></a>
<h2>maximum_line_length</h2>
<b>maximum_line_length</b>(<i>physical_line, max_line_length</i>)
<p>
    Limit all lines to a maximum of 79 characters.
</p><p>
    There are still many devices around that are limited to 80 character
    lines; plus, limiting windows to 80 characters makes it possible to have
    several windows side-by-side.  The default wrapping on such devices looks
    ugly.  Therefore, please limit all lines to a maximum of 79 characters.
    For flowing long blocks of text (docstrings or comments), limiting the
    length to 72 characters is recommended.
</p><p>
    Reports error E501.
</p>
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<hr /><hr />
<a NAME="missing_newline" ID="missing_newline"></a>
<h2>missing_newline</h2>
<b>missing_newline</b>(<i>physical_line</i>)
<p>
    JCR: The last line should have a newline.
</p><p>
    Reports warning W292.
</p>
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<hr /><hr />
<a NAME="missing_whitespace" ID="missing_whitespace"></a>
<h2>missing_whitespace</h2>
<b>missing_whitespace</b>(<i>logical_line</i>)
<p>
    JCR: Each comma, semicolon or colon should be followed by whitespace.
</p><p>
    Okay: [a, b]
    Okay: (3,)
    Okay: a[1:4]
    Okay: a[:4]
    Okay: a[1:]
    Okay: a[1:4:2]
    E231: ['a','b']
    E231: foo(bar,baz)
    E231: [{'a':'b'}]
</p>
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<hr /><hr />
<a NAME="missing_whitespace_around_operator" ID="missing_whitespace_around_operator"></a>
<h2>missing_whitespace_around_operator</h2>
<b>missing_whitespace_around_operator</b>(<i>logical_line, tokens</i>)
<p>
    - Always surround these binary operators with a single space on
      either side: assignment (=), augmented assignment (+=, -= etc.),
      comparisons (==, <, >, !=, <>, <=, >=, in, not in, is, is not),
      Booleans (and, or, not).
</p><p>
    - Use spaces around arithmetic operators.
</p><p>
    Okay: i = i + 1
    Okay: submitted += 1
    Okay: x = x * 2 - 1
    Okay: hypot2 = x * x + y * y
    Okay: c = (a + b) * (a - b)
    Okay: foo(bar, key='word', *args, **kwargs)
    Okay: alpha[:-i]
</p><p>
    E225: i=i+1
    E225: submitted +=1
    E225: x = x /2 - 1
    E225: z = x **y
    E226: c = (a+b) * (a-b)
    E226: hypot2 = x*x + y*y
    E227: c = a|b
    E228: msg = fmt%(errno, errmsg)
</p>
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<hr /><hr />
<a NAME="mute_string" ID="mute_string"></a>
<h2>mute_string</h2>
<b>mute_string</b>(<i>text</i>)
<p>
    Replace contents with 'xxx' to prevent syntax matching.
</p><p>
    >>> mute_string('"abc"')
    '"xxx"'
    >>> mute_string("'''abc'''")
    "'''xxx'''"
    >>> mute_string("r'abc'")
    "r'xxx'"
</p>
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<hr /><hr />
<a NAME="parse_udiff" ID="parse_udiff"></a>
<h2>parse_udiff</h2>
<b>parse_udiff</b>(<i>diff, patterns=None, parent='.'</i>)
<p>
Return a dictionary of matching lines.
</p>
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<hr /><hr />
<a NAME="process_options" ID="process_options"></a>
<h2>process_options</h2>
<b>process_options</b>(<i>arglist=None, parse_argv=False, config_file=None, parser=None</i>)
<p>
Process options passed either via arglist or via command line args.
</p>
<div align="right"><a href="#top">Up</a></div>
<hr /><hr />
<a NAME="python_3000_backticks" ID="python_3000_backticks"></a>
<h2>python_3000_backticks</h2>
<b>python_3000_backticks</b>(<i>logical_line</i>)
<p>
    Backticks are removed in Python 3.
    Use repr() instead.
</p><p>
    Okay: val = repr(1 + 2)
    W604: val = `1 + 2`
</p>
<div align="right"><a href="#top">Up</a></div>
<hr /><hr />
<a NAME="python_3000_has_key" ID="python_3000_has_key"></a>
<h2>python_3000_has_key</h2>
<b>python_3000_has_key</b>(<i>logical_line</i>)
<p>
    The {}.has_key() method is removed in the Python 3.
    Use the 'in' operation instead.
</p><p>
    Okay: if "alph" in d:\n    print d["alph"]
    W601: assert d.has_key('alph')
</p>
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<hr /><hr />
<a NAME="python_3000_not_equal" ID="python_3000_not_equal"></a>
<h2>python_3000_not_equal</h2>
<b>python_3000_not_equal</b>(<i>logical_line</i>)
<p>
    != can also be written <>, but this is an obsolete usage kept for
    backwards compatibility only. New code should always use !=.
    The older syntax is removed in Python 3.
</p><p>
    Okay: if a != 'no':
    W603: if a <> 'no':
</p>
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<hr /><hr />
<a NAME="python_3000_raise_comma" ID="python_3000_raise_comma"></a>
<h2>python_3000_raise_comma</h2>
<b>python_3000_raise_comma</b>(<i>logical_line</i>)
<p>
    When raising an exception, use "raise ValueError('message')"
    instead of the older form "raise ValueError, 'message'".
</p><p>
    The paren-using form is preferred because when the exception arguments
    are long or include string formatting, you don't need to use line
    continuation characters thanks to the containing parentheses.  The older
    form is removed in Python 3.
</p><p>
    Okay: raise DummyError("Message")
    W602: raise DummyError, "Message"
</p>
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<hr /><hr />
<a NAME="read_config" ID="read_config"></a>
<h2>read_config</h2>
<b>read_config</b>(<i>options, args, arglist, parser</i>)
<p>
Read both user configuration and local configuration.
</p>
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<hr /><hr />
<a NAME="readlines" ID="readlines"></a>
<h2>readlines</h2>
<b>readlines</b>(<i>filename</i>)

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<hr /><hr />
<a NAME="readlines_1" ID="readlines_1"></a>
<h2>readlines</h2>
<b>readlines</b>(<i>filename</i>)

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<hr /><hr />
<a NAME="register_check" ID="register_check"></a>
<h2>register_check</h2>
<b>register_check</b>(<i>check, codes=None</i>)
<p>
    Register a new check object.
</p>
<div align="right"><a href="#top">Up</a></div>
<hr /><hr />
<a NAME="stdin_get_value" ID="stdin_get_value"></a>
<h2>stdin_get_value</h2>
<b>stdin_get_value</b>(<i></i>)

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<hr /><hr />
<a NAME="tabs_obsolete" ID="tabs_obsolete"></a>
<h2>tabs_obsolete</h2>
<b>tabs_obsolete</b>(<i>physical_line</i>)
<p>
    For new projects, spaces-only are strongly recommended over tabs.  Most
    editors have features that make this easy to do.
</p><p>
    Okay: if True:\n    return
    W191: if True:\n\treturn
</p>
<div align="right"><a href="#top">Up</a></div>
<hr /><hr />
<a NAME="tabs_or_spaces" ID="tabs_or_spaces"></a>
<h2>tabs_or_spaces</h2>
<b>tabs_or_spaces</b>(<i>physical_line, indent_char</i>)
<p>
    Never mix tabs and spaces.
</p><p>
    The most popular way of indenting Python is with spaces only.  The
    second-most popular way is with tabs only.  Code indented with a mixture
    of tabs and spaces should be converted to using spaces exclusively.  When
    invoking the Python command line interpreter with the -t option, it issues
    warnings about code that illegally mixes tabs and spaces.  When using -tt
    these warnings become errors.  These options are highly recommended!
</p><p>
    Okay: if a == 0:\n        a = 1\n        b = 1
    E101: if a == 0:\n        a = 1\n\tb = 1
</p>
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<hr /><hr />
<a NAME="trailing_blank_lines" ID="trailing_blank_lines"></a>
<h2>trailing_blank_lines</h2>
<b>trailing_blank_lines</b>(<i>physical_line, lines, line_number</i>)
<p>
    JCR: Trailing blank lines are superfluous.
</p><p>
    Okay: spam(1)
    W391: spam(1)\n
</p>
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<hr /><hr />
<a NAME="trailing_whitespace" ID="trailing_whitespace"></a>
<h2>trailing_whitespace</h2>
<b>trailing_whitespace</b>(<i>physical_line</i>)
<p>
    JCR: Trailing whitespace is superfluous.
    FBM: Except when it occurs as part of a blank line (i.e. the line is
         nothing but whitespace). According to Python docs[1] a line with only
         whitespace is considered a blank line, and is to be ignored. However,
         matching a blank line to its indentation level avoids mistakenly
         terminating a multi-line statement (e.g. class declaration) when
         pasting code into the standard Python interpreter.
</p><p>
         [1] http://docs.python.org/reference/lexical_analysis.html#blank-lines
</p><p>
    The warning returned varies on whether the line itself is blank, for easier
    filtering for those who want to indent their blank lines.
</p><p>
    Okay: spam(1)\n#
    W291: spam(1) \n#
    W293: class Foo(object):\n    \n    bang = 12
</p>
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<hr /><hr />
<a NAME="whitespace_around_comma" ID="whitespace_around_comma"></a>
<h2>whitespace_around_comma</h2>
<b>whitespace_around_comma</b>(<i>logical_line</i>)
<p>
    Avoid extraneous whitespace in the following situations:
</p><p>
    - More than one space around an assignment (or other) operator to
      align it with another.
</p><p>
    JCR: This should also be applied around comma etc.
    Note: these checks are disabled by default
</p><p>
    Okay: a = (1, 2)
    E241: a = (1,  2)
    E242: a = (1,\t2)
</p>
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<hr /><hr />
<a NAME="whitespace_around_keywords" ID="whitespace_around_keywords"></a>
<h2>whitespace_around_keywords</h2>
<b>whitespace_around_keywords</b>(<i>logical_line</i>)
<p>
    Avoid extraneous whitespace around keywords.
</p><p>
    Okay: True and False
    E271: True and  False
    E272: True  and False
    E273: True and\tFalse
    E274: True\tand False
</p>
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<hr /><hr />
<a NAME="whitespace_around_named_parameter_equals" ID="whitespace_around_named_parameter_equals"></a>
<h2>whitespace_around_named_parameter_equals</h2>
<b>whitespace_around_named_parameter_equals</b>(<i>logical_line, tokens</i>)
<p>
    Don't use spaces around the '=' sign when used to indicate a
    keyword argument or a default parameter value.
</p><p>
    Okay: def complex(real, imag=0.0):
    Okay: return magic(r=real, i=imag)
    Okay: boolean(a == b)
    Okay: boolean(a != b)
    Okay: boolean(a <= b)
    Okay: boolean(a >= b)
</p><p>
    E251: def complex(real, imag = 0.0):
    E251: return magic(r = real, i = imag)
</p>
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<hr /><hr />
<a NAME="whitespace_around_operator" ID="whitespace_around_operator"></a>
<h2>whitespace_around_operator</h2>
<b>whitespace_around_operator</b>(<i>logical_line</i>)
<p>
    Avoid extraneous whitespace in the following situations:
</p><p>
    - More than one space around an assignment (or other) operator to
      align it with another.
</p><p>
    Okay: a = 12 + 3
    E221: a = 4  + 5
    E222: a = 4 +  5
    E223: a = 4\t+ 5
    E224: a = 4 +\t5
</p>
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<hr /><hr />
<a NAME="whitespace_before_inline_comment" ID="whitespace_before_inline_comment"></a>
<h2>whitespace_before_inline_comment</h2>
<b>whitespace_before_inline_comment</b>(<i>logical_line, tokens</i>)
<p>
    Separate inline comments by at least two spaces.
</p><p>
    An inline comment is a comment on the same line as a statement.  Inline
    comments should be separated by at least two spaces from the statement.
    They should start with a # and a single space.
</p><p>
    Okay: x = x + 1  # Increment x
    Okay: x = x + 1    # Increment x
    E261: x = x + 1 # Increment x
    E262: x = x + 1  #Increment x
    E262: x = x + 1  #  Increment x
</p>
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<hr /><hr />
<a NAME="whitespace_before_parameters" ID="whitespace_before_parameters"></a>
<h2>whitespace_before_parameters</h2>
<b>whitespace_before_parameters</b>(<i>logical_line, tokens</i>)
<p>
    Avoid extraneous whitespace in the following situations:
</p><p>
    - Immediately before the open parenthesis that starts the argument
      list of a function call.
</p><p>
    - Immediately before the open parenthesis that starts an indexing or
      slicing.
</p><p>
    Okay: spam(1)
    E211: spam (1)
</p><p>
    Okay: dict['key'] = list[index]
    E211: dict ['key'] = list[index]
    E211: dict['key'] = list [index]
</p>
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