Documentation/Source/eric5.UtilitiesPython2.pep8.html

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<h1>eric5.UtilitiesPython2.pep8</h1>

<h3>Global Attributes</h3>
<table>
<tr><td>BENCHMARK_KEYS</td></tr><tr><td>BINARY_OPERATORS</td></tr><tr><td>DEFAULT_EXCLUDE</td></tr><tr><td>DEFAULT_IGNORE</td></tr><tr><td>DOCSTRING_REGEX</td></tr><tr><td>E225NOT_KEYWORDS</td></tr><tr><td>ERRORCODE_REGEX</td></tr><tr><td>EXTRANEOUS_WHITESPACE_REGEX</td></tr><tr><td>INDENT_REGEX</td></tr><tr><td>MAX_LINE_LENGTH</td></tr><tr><td>OPERATORS</td></tr><tr><td>RAISE_COMMA_REGEX</td></tr><tr><td>SELFTEST_REGEX</td></tr><tr><td>SKIP_TOKENS</td></tr><tr><td>UNARY_OPERATORS</td></tr><tr><td>WHITESPACE</td></tr><tr><td>WHITESPACE_AROUND_NAMED_PARAMETER_REGEX</td></tr><tr><td>WHITESPACE_AROUND_OPERATOR_REGEX</td></tr><tr><td>__version__</td></tr><tr><td>args</td></tr><tr><td>options</td></tr>
</table>
<h3>Classes</h3>
<table>
<tr>
<td><a href="#Checker">Checker</a></td>
<td>Load a Python source file, tokenize it, check coding style.</td>
</tr>
</table>
<h3>Functions</h3>
<table>
<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></td>
</tr><tr>
<td><a href="#compound_statements">compound_statements</a></td>
<td></td>
</tr><tr>
<td><a href="#excluded">excluded</a></td>
<td>Check if options.exclude contains a pattern that matches filename.</td>
</tr><tr>
<td><a href="#expand_indent">expand_indent</a></td>
<td>Return the amount of indentation.</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 options.filename contains a pattern that matches filename.</td>
</tr><tr>
<td><a href="#find_checks">find_checks</a></td>
<td>Find all globally visible functions where the first argument name starts with argument_name.</td>
</tr><tr>
<td><a href="#get_count">get_count</a></td>
<td>Return the total count of errors and warnings.</td>
</tr><tr>
<td><a href="#get_error_statistics">get_error_statistics</a></td>
<td>Get error statistics.</td>
</tr><tr>
<td><a href="#get_statistics">get_statistics</a></td>
<td>Get statistics for message codes that start with the prefix.</td>
</tr><tr>
<td><a href="#get_warning_statistics">get_warning_statistics</a></td>
<td>Get warning statistics.</td>
</tr><tr>
<td><a href="#ignore_code">ignore_code</a></td>
<td>Check if options.ignore contains a prefix of the error code.</td>
</tr><tr>
<td><a href="#imports_on_separate_lines">imports_on_separate_lines</a></td>
<td></td>
</tr><tr>
<td><a href="#indentation">indentation</a></td>
<td></td>
</tr><tr>
<td><a href="#input_dir">input_dir</a></td>
<td>Check all Python source files in this directory and all subdirectories.</td>
</tr><tr>
<td><a href="#input_file">input_file</a></td>
<td>Run all checks on a Python source file.</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="#message">message</a></td>
<td>Print a message.</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></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="#print_benchmark">print_benchmark</a></td>
<td>Print benchmark numbers.</td>
</tr><tr>
<td><a href="#print_statistics">print_statistics</a></td>
<td>Print overall statistics (number of errors and warnings).</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 3000.</td>
</tr><tr>
<td><a href="#python_3000_has_key">python_3000_has_key</a></td>
<td>The {}.has_key() method will be removed in the future version of Python.</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="#readlines">readlines</a></td>
<td></td>
</tr><tr>
<td><a href="#readlines_1">readlines</a></td>
<td></td>
</tr><tr>
<td><a href="#reset_counters">reset_counters</a></td>
<td></td>
</tr><tr>
<td><a href="#run_tests">run_tests</a></td>
<td>Run all the tests from a file.</td>
</tr><tr>
<td><a href="#selftest">selftest</a></td>
<td>Test all check functions with test cases in docstrings.</td>
</tr><tr>
<td><a href="#tabs_obsolete">tabs_obsolete</a></td>
<td></td>
</tr><tr>
<td><a href="#tabs_or_spaces">tabs_or_spaces</a></td>
<td></td>
</tr><tr>
<td><a href="#trailing_blank_lines">trailing_blank_lines</a></td>
<td></td>
</tr><tr>
<td><a href="#trailing_whitespace">trailing_whitespace</a></td>
<td></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_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="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_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.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_error">report_error</a></td>
<td>Report an error, according to options.</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, lines=None</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_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.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_error" ID="Checker.report_error"></a>
<h4>Checker.report_error</h4>
<b>report_error</b>(<i>line_number, offset, text, check</i>)
<p>
        Report an error, according to options.
</p><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="_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, blank_lines_before_comment</i>)

<div align="right"><a href="#top">Up</a></div>
<hr /><hr />
<a NAME="compound_statements" ID="compound_statements"></a>
<h2>compound_statements</h2>
<b>compound_statements</b>(<i>logical_line</i>)

<div align="right"><a href="#top">Up</a></div>
<hr /><hr />
<a NAME="excluded" ID="excluded"></a>
<h2>excluded</h2>
<b>excluded</b>(<i>filename</i>)
<p>
    Check if options.exclude contains a pattern that matches filename.
</p>
<div align="right"><a href="#top">Up</a></div>
<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>
<div align="right"><a href="#top">Up</a></div>
<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>
<div align="right"><a href="#top">Up</a></div>
<hr /><hr />
<a NAME="filename_match" ID="filename_match"></a>
<h2>filename_match</h2>
<b>filename_match</b>(<i>filename</i>)
<p>
    Check if options.filename contains a pattern that matches filename.
    If options.filename is unspecified, this always returns True.
</p>
<div align="right"><a href="#top">Up</a></div>
<hr /><hr />
<a NAME="find_checks" ID="find_checks"></a>
<h2>find_checks</h2>
<b>find_checks</b>(<i>argument_name</i>)
<p>
    Find all globally visible functions where the first argument name
    starts with argument_name.
</p>
<div align="right"><a href="#top">Up</a></div>
<hr /><hr />
<a NAME="get_count" ID="get_count"></a>
<h2>get_count</h2>
<b>get_count</b>(<i>prefix=''</i>)
<p>
Return the total count of errors and warnings.
</p>
<div align="right"><a href="#top">Up</a></div>
<hr /><hr />
<a NAME="get_error_statistics" ID="get_error_statistics"></a>
<h2>get_error_statistics</h2>
<b>get_error_statistics</b>(<i></i>)
<p>
Get error statistics.
</p>
<div align="right"><a href="#top">Up</a></div>
<hr /><hr />
<a NAME="get_statistics" ID="get_statistics"></a>
<h2>get_statistics</h2>
<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>
<div align="right"><a href="#top">Up</a></div>
<hr /><hr />
<a NAME="get_warning_statistics" ID="get_warning_statistics"></a>
<h2>get_warning_statistics</h2>
<b>get_warning_statistics</b>(<i></i>)
<p>
Get warning statistics.
</p>
<div align="right"><a href="#top">Up</a></div>
<hr /><hr />
<a NAME="ignore_code" ID="ignore_code"></a>
<h2>ignore_code</h2>
<b>ignore_code</b>(<i>code</i>)
<p>
    Check if options.ignore contains a prefix of the error code.
    If options.select contains a prefix of the error code, do not ignore it.
</p>
<div align="right"><a href="#top">Up</a></div>
<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>)

<div align="right"><a href="#top">Up</a></div>
<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>)

<div align="right"><a href="#top">Up</a></div>
<hr /><hr />
<a NAME="input_dir" ID="input_dir"></a>
<h2>input_dir</h2>
<b>input_dir</b>(<i>dirname, runner=None</i>)
<p>
    Check all Python source files in this directory and all subdirectories.
</p>
<div align="right"><a href="#top">Up</a></div>
<hr /><hr />
<a NAME="input_file" ID="input_file"></a>
<h2>input_file</h2>
<b>input_file</b>(<i>filename</i>)
<p>
    Run all checks on a Python source file.
</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</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>
<div align="right"><a href="#top">Up</a></div>
<hr /><hr />
<a NAME="message" ID="message"></a>
<h2>message</h2>
<b>message</b>(<i>text</i>)
<p>
Print a message.
</p>
<div align="right"><a href="#top">Up</a></div>
<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>
<div align="right"><a href="#top">Up</a></div>
<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)
</p>
<div align="right"><a href="#top">Up</a></div>
<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>)

<div align="right"><a href="#top">Up</a></div>
<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>
<div align="right"><a href="#top">Up</a></div>
<hr /><hr />
<a NAME="print_benchmark" ID="print_benchmark"></a>
<h2>print_benchmark</h2>
<b>print_benchmark</b>(<i>elapsed</i>)
<p>
    Print benchmark numbers.
</p>
<div align="right"><a href="#top">Up</a></div>
<hr /><hr />
<a NAME="print_statistics" ID="print_statistics"></a>
<h2>print_statistics</h2>
<b>print_statistics</b>(<i>prefix=''</i>)
<p>
Print overall statistics (number of errors and warnings).
</p>
<div align="right"><a href="#top">Up</a></div>
<hr /><hr />
<a NAME="process_options" ID="process_options"></a>
<h2>process_options</h2>
<b>process_options</b>(<i>arglist=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 3000.
    Use repr() instead.
</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 will be removed in the future version of
    Python. Use the 'in' operation instead, like:
    d = {"a": 1, "b": 2}
    if "b" in d:
        print d["b"]
</p>
<div align="right"><a href="#top">Up</a></div>
<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 3000.
</p>
<div align="right"><a href="#top">Up</a></div>
<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 will be removed in Python 3000.
</p>
<div align="right"><a href="#top">Up</a></div>
<hr /><hr />
<a NAME="readlines" ID="readlines"></a>
<h2>readlines</h2>
<b>readlines</b>(<i>filename</i>)

<div align="right"><a href="#top">Up</a></div>
<hr /><hr />
<a NAME="readlines_1" ID="readlines_1"></a>
<h2>readlines</h2>
<b>readlines</b>(<i>filename</i>)

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<a NAME="reset_counters" ID="reset_counters"></a>
<h2>reset_counters</h2>
<b>reset_counters</b>(<i></i>)

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<a NAME="run_tests" ID="run_tests"></a>
<h2>run_tests</h2>
<b>run_tests</b>(<i>filename</i>)
<p>
    Run all the tests from a file.
</p><p>
    A test file can provide many tests.  Each test starts with a declaration.
    This declaration is a single line starting with '#:'.
    It declares codes of expected failures, separated by spaces or 'Okay'
    if no failure is expected.
    If the file does not contain such declaration, it should pass all tests.
    If the declaration is empty, following lines are not checked, until next
    declaration.
</p><p>
    Examples:
</p><p>
     * Only E224 and W701 are expected:         #: E224 W701
     * Following example is conform:            #: Okay
     * Don't check these lines:                 #:
</p>
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<a NAME="selftest" ID="selftest"></a>
<h2>selftest</h2>
<b>selftest</b>(<i></i>)
<p>
    Test all check functions with test cases in docstrings.
</p>
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<a NAME="tabs_obsolete" ID="tabs_obsolete"></a>
<h2>tabs_obsolete</h2>
<b>tabs_obsolete</b>(<i>physical_line</i>)

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<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>)

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<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>)

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<a NAME="trailing_whitespace" ID="trailing_whitespace"></a>
<h2>trailing_whitespace</h2>
<b>trailing_whitespace</b>(<i>physical_line</i>)

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<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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<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</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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<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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<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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<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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