src/eric7/Documentation/Source/eric7.Plugins.CheckerPlugins.CodeStyleChecker.Annotations.AnnotationsFunctionVisitor.html

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<h1>eric7.Plugins.CheckerPlugins.CodeStyleChecker.Annotations.AnnotationsFunctionVisitor</h1>

<p>
Module implementing a node visitor for function type annotations.
</p>
<h3>Global Attributes</h3>

<table>
<tr><td>AST_ARG_TYPES</td></tr>
</table>
<h3>Classes</h3>

<table>

<tr>
<td><a href="#Argument">Argument</a></td>
<td>Class representing a function argument.</td>
</tr>
<tr>
<td><a href="#Function">Function</a></td>
<td>Class representing a function.</td>
</tr>
<tr>
<td><a href="#FunctionVisitor">FunctionVisitor</a></td>
<td>Class implementing a node visitor to check function annotations.</td>
</tr>
<tr>
<td><a href="#ReturnVisitor">ReturnVisitor</a></td>
<td>Class implementing a node visitor to check the return statements of a function node.</td>
</tr>
</table>
<h3>Functions</h3>

<table>
<tr><td>None</td></tr>
</table>
<hr />
<hr />
<a NAME="Argument" ID="Argument"></a>
<h2>Argument</h2>

<p>
    Class representing a function argument.
</p>
<h3>Derived from</h3>
None
<h3>Class Attributes</h3>

<table>
<tr><td>None</td></tr>
</table>
<h3>Class Methods</h3>

<table>

<tr>
<td><a href="#Argument.fromNode">fromNode</a></td>
<td>Class method to create an Argument object based on the given node.</td>
</tr>
</table>
<h3>Methods</h3>

<table>

<tr>
<td><a href="#Argument.__init__">Argument</a></td>
<td>Constructor</td>
</tr>
</table>
<h3>Static Methods</h3>

<table>

<tr>
<td><a href="#Argument._isAnnotatedAny">_isAnnotatedAny</a></td>
<td>Static method to check if the provided expression node is annotated with 'typing.Any'.</td>
</tr>
</table>

<a NAME="Argument.fromNode" ID="Argument.fromNode"></a>
<h4>Argument.fromNode (class method)</h4>
<b>fromNode</b>(<i>node, annotationTypeName</i>)

<p>
        Class method to create an Argument object based on the given node.
</p>
<dl>

<dt><i>node</i> (ast.arguments)</dt>
<dd>
reference to the node to be converted
</dd>
<dt><i>annotationTypeName</i> (str)</dt>
<dd>
name of the annotation type
</dd>
</dl>
<dl>
<dt>Return:</dt>
<dd>
Argument object
</dd>
</dl>
<dl>
<dt>Return Type:</dt>
<dd>
Argument
</dd>
</dl>
<a NAME="Argument.__init__" ID="Argument.__init__"></a>
<h4>Argument (Constructor)</h4>
<b>Argument</b>(<i>argname, lineno, col_offset, annotationType, hasTypeAnnotation=False, has3107Annotation=False, hasTypeComment=False, isDynamicallyTyped=False, </i>)

<p>
        Constructor
</p>
<dl>

<dt><i>argname</i> (str)</dt>
<dd>
name of the argument
</dd>
<dt><i>lineno</i> (int)</dt>
<dd>
line number
</dd>
<dt><i>col_offset</i> (int)</dt>
<dd>
column number
</dd>
<dt><i>annotationType</i> (AnnotationType)</dt>
<dd>
type of annotation
</dd>
<dt><i>hasTypeAnnotation</i> (bool (optional))</dt>
<dd>
flag indicating the presence of a type
            annotation (defaults to False)
</dd>
<dt><i>has3107Annotation</i> (bool (optional))</dt>
<dd>
flag indicating the presence of a PEP 3107
            annotation (defaults to False)
</dd>
<dt><i>hasTypeComment</i> (bool (optional))</dt>
<dd>
flag indicating the presence of a type comment
            (defaults to False)
</dd>
<dt><i>isDynamicallyTyped</i> (bool (optional))</dt>
<dd>
flag indicating dynamic typing (defaults to False)
</dd>
</dl>
<a NAME="Argument._isAnnotatedAny" ID="Argument._isAnnotatedAny"></a>
<h4>Argument._isAnnotatedAny (static)</h4>
<b>_isAnnotatedAny</b>(<i></i>)

<p>
        Static method to check if the provided expression node is annotated with
        'typing.Any'.
</p>
<p>
        Support is provided for the following patterns:
            * 'from typing import Any; foo: Any'
            * 'import typing; foo: typing.Any'
            * 'import typing as <alias>; foo: <alias>.Any'
</p>
<p>
        Type comments are also supported. Inline type comments are assumed to be
        passed here as 'str', and function-level type comments are assumed to be
        passed as 'ast.expr'.
</p>
<dl>

<dt><i>argExpr</i> (ast.expr or str)</dt>
<dd>
DESCRIPTION
</dd>
</dl>
<dl>
<dt>Return:</dt>
<dd>
flag indicating an annotation with 'typing.Any'
</dd>
</dl>
<dl>
<dt>Return Type:</dt>
<dd>
bool
</dd>
</dl>
<div align="right"><a href="#top">Up</a></div>
<hr />
<hr />
<a NAME="Function" ID="Function"></a>
<h2>Function</h2>

<p>
    Class representing a function.
</p>
<h3>Derived from</h3>
None
<h3>Class Attributes</h3>

<table>
<tr><td>None</td></tr>
</table>
<h3>Class Methods</h3>

<table>

<tr>
<td><a href="#Function.fromNode">fromNode</a></td>
<td>Class method to create a Function object from ast.FunctionDef or ast.AsyncFunctionDef nodes.</td>
</tr>
</table>
<h3>Methods</h3>

<table>

<tr>
<td><a href="#Function.__init__">Function</a></td>
<td>Constructor</td>
</tr>
<tr>
<td><a href="#Function.__decoratorChecker">__decoratorChecker</a></td>
<td>Private method to check the provided decorator for a match against the provided set of check names.</td>
</tr>
<tr>
<td><a href="#Function.getAnnotatedArguments">getAnnotatedArguments</a></td>
<td>Public method to get list of arguments with type annotations.</td>
</tr>
<tr>
<td><a href="#Function.getMissedAnnotations">getMissedAnnotations</a></td>
<td>Public method to provide a list of arguments with missing type annotations.</td>
</tr>
<tr>
<td><a href="#Function.hasDecorator">hasDecorator</a></td>
<td>Public method to check whether the function node is decorated by any of the provided decorators.</td>
</tr>
<tr>
<td><a href="#Function.isDynamicallyTyped">isDynamicallyTyped</a></td>
<td>Public method to check, if a function definition is dynamically typed (i.e.</td>
</tr>
<tr>
<td><a href="#Function.isFullyAnnotated">isFullyAnnotated</a></td>
<td>Public method to check, if the function definition is fully type annotated.</td>
</tr>
</table>
<h3>Static Methods</h3>

<table>

<tr>
<td><a href="#Function._maybeInjectClassArgument">_maybeInjectClassArgument</a></td>
<td>Static method to inject `self` or `cls` args into a type comment to align with PEP 3107-style annotations.</td>
</tr>
<tr>
<td><a href="#Function._singleLineColonSeeker">_singleLineColonSeeker</a></td>
<td>Static method to find the line & column indices of a single line function definition.</td>
</tr>
<tr>
<td><a href="#Function.colonSeeker">colonSeeker</a></td>
<td>Static method to find the line & column indices of the function definition's closing colon.</td>
</tr>
<tr>
<td><a href="#Function.getClassDecoratorType">getClassDecoratorType</a></td>
<td>Static method to get the class method's decorator type from its function node.</td>
</tr>
<tr>
<td><a href="#Function.getFunctionType">getFunctionType</a></td>
<td>Static method to determine the function's FunctionType from its name.</td>
</tr>
<tr>
<td><a href="#Function.tryTypeComment">tryTypeComment</a></td>
<td>Static method to infer type hints from a function-level type comment.</td>
</tr>
</table>

<a NAME="Function.fromNode" ID="Function.fromNode"></a>
<h4>Function.fromNode (class method)</h4>
<b>fromNode</b>(<i>node, lines, **kwargs</i>)

<p>
        Class method to create a Function object from ast.FunctionDef or
        ast.AsyncFunctionDef nodes.
</p>
<p>
        Accept the source code, as a list of strings, in order to get the
        column where the function definition ends.
</p>
<p>
        With exceptions, input kwargs are passed straight through to Function's
        __init__. The following kwargs will be overridden:
          * function_type
          * class_decorator_type
          * args
</p>
<dl>

<dt><i>node</i> (ast.AsyncFunctionDef or ast.FunctionDef)</dt>
<dd>
reference to the function definition node
</dd>
<dt><i>lines</i> (list of str)</dt>
<dd>
list of source code lines
</dd>
<dt><i>**kwargs=</i> (dict)</dt>
<dd>
keyword arguments
</dd>
</dl>
<dl>
<dt>Return:</dt>
<dd>
created Function object
</dd>
</dl>
<dl>
<dt>Return Type:</dt>
<dd>
Function
</dd>
</dl>
<a NAME="Function.__init__" ID="Function.__init__"></a>
<h4>Function (Constructor)</h4>
<b>Function</b>(<i>name, lineno, col_offset, functionType=FunctionType.PUBLIC, isClassMethod=False, classDecoratorType=None, isReturnAnnotated=False, hasTypeComment=False, hasOnlyNoneReturns=True, isNested=False, decoratorList=None, args=None, </i>)

<p>
        Constructor
</p>
<dl>

<dt><i>name</i> (str)</dt>
<dd>
name of the function
</dd>
<dt><i>lineno</i> (int)</dt>
<dd>
line number
</dd>
<dt><i>col_offset</i> (int)</dt>
<dd>
column number
</dd>
<dt><i>functionType</i> (FunctionType (optional))</dt>
<dd>
type of the function (defaults to
            FunctionType.PUBLIC)
</dd>
<dt><i>isClassMethod</i> (bool (optional))</dt>
<dd>
flag indicating a class method (defaults to False)
</dd>
<dt><i>classDecoratorType</i> (ClassDecoratorType or None (optional))</dt>
<dd>
type of a function decorator
            (defaults to None)
</dd>
<dt><i>isReturnAnnotated</i> (bool (optional))</dt>
<dd>
flag indicating the presence of a return
            type annotation (defaults to False)
</dd>
<dt><i>hasTypeComment</i> (bool (optional))</dt>
<dd>
flag indicating the presence of a type comment
            (defaults to False)
</dd>
<dt><i>hasOnlyNoneReturns</i> (bool (optional))</dt>
<dd>
flag indicating only None return values
            (defaults to True)
</dd>
<dt><i>isNested</i> (bool (optional))</dt>
<dd>
flag indicating a nested function (defaults to False)
</dd>
<dt><i>decoratorList</i> (list of ast.Attribute, ast.Call or ast.Name (optional))</dt>
<dd>
list of decorator nodes (defaults to None)
</dd>
<dt><i>args</i> (list of Argument (optional))</dt>
<dd>
list of arguments (defaults to None)
</dd>
</dl>
<a NAME="Function.__decoratorChecker" ID="Function.__decoratorChecker"></a>
<h4>Function.__decoratorChecker</h4>
<b>__decoratorChecker</b>(<i>decorator, checkDecorators</i>)

<p>
        Private method to check the provided decorator for a match against the
        provided set of check names.
</p>
<p>
        Decorators are assumed to be of the following form:
            * `a.name` or `a.name()`
            * `name` or `name()`
</p>
<p>
        Note: Deeper imports (e.g. `a.b.name`) are not explicitly supported.
</p>
<dl>

<dt><i>decorator</i> (ast.Attribute, ast.Call or ast.Name)</dt>
<dd>
decorator node to check
</dd>
<dt><i>checkDecorators</i> (set of str)</dt>
<dd>
set of decorators to check against
</dd>
</dl>
<dl>
<dt>Return:</dt>
<dd>
flag indicating the presence of any decorators
</dd>
</dl>
<dl>
<dt>Return Type:</dt>
<dd>
bool
</dd>
</dl>
<a NAME="Function.getAnnotatedArguments" ID="Function.getAnnotatedArguments"></a>
<h4>Function.getAnnotatedArguments</h4>
<b>getAnnotatedArguments</b>(<i></i>)

<p>
        Public method to get list of arguments with type annotations.
</p>
<dl>
<dt>Return:</dt>
<dd>
list of arguments with type annotations.
</dd>
</dl>
<dl>
<dt>Return Type:</dt>
<dd>
list of Argument
</dd>
</dl>
<a NAME="Function.getMissedAnnotations" ID="Function.getMissedAnnotations"></a>
<h4>Function.getMissedAnnotations</h4>
<b>getMissedAnnotations</b>(<i></i>)

<p>
        Public method to provide a list of arguments with missing type
        annotations.
</p>
<dl>
<dt>Return:</dt>
<dd>
list of arguments with missing type annotations
</dd>
</dl>
<dl>
<dt>Return Type:</dt>
<dd>
list of Argument
</dd>
</dl>
<a NAME="Function.hasDecorator" ID="Function.hasDecorator"></a>
<h4>Function.hasDecorator</h4>
<b>hasDecorator</b>(<i>checkDecorators</i>)

<p>
        Public method to check whether the function node is decorated by any of
        the provided decorators.
</p>
<p>
        Decorator matching is done against the provided `checkDecorators` set.
        Decorators are assumed to be either a module attribute (e.g.
        `@typing.overload`) or name (e.g. `@overload`). For the case of a
        module attribute, only the attribute is checked against
        `overload_decorators`.
</p>
<p>
        Note: Deeper decorator imports (e.g. `a.b.overload`) are not explicitly
        supported.
</p>
<dl>

<dt><i>checkDecorators</i> (set of str)</dt>
<dd>
set of decorators to check against
</dd>
</dl>
<dl>
<dt>Return:</dt>
<dd>
flag indicating the presence of any decorators
</dd>
</dl>
<dl>
<dt>Return Type:</dt>
<dd>
bool
</dd>
</dl>
<a NAME="Function.isDynamicallyTyped" ID="Function.isDynamicallyTyped"></a>
<h4>Function.isDynamicallyTyped</h4>
<b>isDynamicallyTyped</b>(<i></i>)

<p>
        Public method to check, if a function definition is dynamically typed
        (i.e. completely lacking hints).
</p>
<dl>
<dt>Return:</dt>
<dd>
flag indicating a dynamically typed function definition
</dd>
</dl>
<dl>
<dt>Return Type:</dt>
<dd>
bool
</dd>
</dl>
<a NAME="Function.isFullyAnnotated" ID="Function.isFullyAnnotated"></a>
<h4>Function.isFullyAnnotated</h4>
<b>isFullyAnnotated</b>(<i></i>)

<p>
        Public method to check, if the function definition is fully type
        annotated.
</p>
<p>
        Note: self.args will always include an Argument object for return.
</p>
<dl>
<dt>Return:</dt>
<dd>
flag indicating a fully annotated function definition
</dd>
</dl>
<dl>
<dt>Return Type:</dt>
<dd>
bool
</dd>
</dl>
<a NAME="Function._maybeInjectClassArgument" ID="Function._maybeInjectClassArgument"></a>
<h4>Function._maybeInjectClassArgument (static)</h4>
<b>_maybeInjectClassArgument</b>(<i>funcObj</i>)

<p>
        Static method to inject `self` or `cls` args into a type comment to
        align with PEP 3107-style annotations.
</p>
<p>
        Because PEP 484 does not describe a method to provide partial function-
        level type comments, there is a potential for ambiguity in the context
        of both class methods and classmethods when aligning type comments to
        method arguments.
</p>
<p>
        These two class methods, for example, should lint equivalently:
</p>
<p>
            def bar(self, a):
                # type: (int) -> int
                ...
</p>
<p>
            def bar(self, a: int) -> int
                ...
</p>
<p>
        When this example type comment is parsed by `ast` and then matched with
        the method's arguments, it associates the `int` hint to `self` rather
        than `a`, so a dummy hint needs to be provided in situations where
        `self` or `class` are not hinted in the type comment in order to
        achieve equivalent linting results to PEP-3107 style annotations.
</p>
<p>
        A dummy `ast.Ellipses` constant is injected if the following criteria
        are met:
            1. The function node is either a class method or classmethod
            2. The number of hinted args is at least 1 less than the number
               of function args
</p>
<dl>

<dt><i>hintTree</i> (ast.FunctionType)</dt>
<dd>
parsed type hint node
</dd>
<dt><i>funcObj</i> (Function)</dt>
<dd>
reference to the Function object
</dd>
</dl>
<dl>
<dt>Return:</dt>
<dd>
reference to the hint node
</dd>
</dl>
<dl>
<dt>Return Type:</dt>
<dd>
ast.FunctionType
</dd>
</dl>
<a NAME="Function._singleLineColonSeeker" ID="Function._singleLineColonSeeker"></a>
<h4>Function._singleLineColonSeeker (static)</h4>
<b>_singleLineColonSeeker</b>(<i>line</i>)

<p>
        Static method to find the line & column indices of a single line
        function definition.
</p>
<dl>

<dt><i>node</i> (ast.AsyncFunctionDef or ast.FunctionDef)</dt>
<dd>
reference to the function definition node
</dd>
<dt><i>line</i> (str)</dt>
<dd>
source code line
</dd>
</dl>
<dl>
<dt>Return:</dt>
<dd>
line and column offset of the colon
</dd>
</dl>
<dl>
<dt>Return Type:</dt>
<dd>
tuple of (int, int)
</dd>
</dl>
<a NAME="Function.colonSeeker" ID="Function.colonSeeker"></a>
<h4>Function.colonSeeker (static)</h4>
<b>colonSeeker</b>(<i>lines</i>)

<p>
        Static method to find the line & column indices of the function
        definition's closing colon.
</p>
<dl>

<dt><i>node</i> (ast.AsyncFunctionDef or ast.FunctionDef)</dt>
<dd>
reference to the function definition node
</dd>
<dt><i>lines</i> (list of str)</dt>
<dd>
list of source code lines
</dd>
</dl>
<dl>
<dt>Return:</dt>
<dd>
line and column offset of the colon
</dd>
</dl>
<dl>
<dt>Return Type:</dt>
<dd>
tuple of (int, int)
</dd>
</dl>
<a NAME="Function.getClassDecoratorType" ID="Function.getClassDecoratorType"></a>
<h4>Function.getClassDecoratorType (static)</h4>
<b>getClassDecoratorType</b>(<i></i>)

<p>
        Static method to get the class method's decorator type from its
        function node.
</p>
<p>
        Only @classmethod and @staticmethod decorators are identified; all
        other decorators are ignored
</p>
<p>
        If @classmethod or @staticmethod decorators are not present, this
        function will return None.
</p>
<dl>

<dt><i>functionNode</i> (ast.AsyncFunctionDef or ast.FunctionDef)</dt>
<dd>
reference to the function definition node
</dd>
</dl>
<dl>
<dt>Return:</dt>
<dd>
class decorator type
</dd>
</dl>
<dl>
<dt>Return Type:</dt>
<dd>
ClassDecoratorType or None
</dd>
</dl>
<a NAME="Function.getFunctionType" ID="Function.getFunctionType"></a>
<h4>Function.getFunctionType (static)</h4>
<b>getFunctionType</b>(<i></i>)

<p>
        Static method to determine the function's FunctionType from its name.
</p>
<p>
        MethodType is determined by the following priority:
          1. Special: function name prefixed & suffixed by "__"
          2. Private: function name prefixed by "__"
          3. Protected: function name prefixed by "_"
          4. Public: everything else
</p>
<dl>

<dt><i>functionName</i> (str)</dt>
<dd>
function name to be checked
</dd>
</dl>
<dl>
<dt>Return:</dt>
<dd>
type of function
</dd>
</dl>
<dl>
<dt>Return Type:</dt>
<dd>
FunctionType
</dd>
</dl>
<a NAME="Function.tryTypeComment" ID="Function.tryTypeComment"></a>
<h4>Function.tryTypeComment (static)</h4>
<b>tryTypeComment</b>(<i>node</i>)

<p>
        Static method to infer type hints from a function-level type comment.
</p>
<p>
        If a function is type commented it is assumed to have a return
        annotation, otherwise Python will fail to parse the hint.
</p>
<dl>

<dt><i>funcObj</i> (Function)</dt>
<dd>
reference to the Function object
</dd>
<dt><i>node</i> (ast.AsyncFunctionDef or ast.FunctionDef)</dt>
<dd>
reference to the function definition node
</dd>
</dl>
<dl>
<dt>Return:</dt>
<dd>
reference to the modified Function object
</dd>
</dl>
<dl>
<dt>Return Type:</dt>
<dd>
Function
</dd>
</dl>
<div align="right"><a href="#top">Up</a></div>
<hr />
<hr />
<a NAME="FunctionVisitor" ID="FunctionVisitor"></a>
<h2>FunctionVisitor</h2>

<p>
    Class implementing a node visitor to check function annotations.
</p>
<h3>Derived from</h3>
ast.NodeVisitor
<h3>Class Attributes</h3>

<table>
<tr><td>AstFuncTypes</td></tr><tr><td>visit_AsyncFunctionDef</td></tr><tr><td>visit_ClassDef</td></tr><tr><td>visit_FunctionDef</td></tr>
</table>
<h3>Class Methods</h3>

<table>
<tr><td>None</td></tr>
</table>
<h3>Methods</h3>

<table>

<tr>
<td><a href="#FunctionVisitor.__init__">FunctionVisitor</a></td>
<td>Constructor</td>
</tr>
<tr>
<td><a href="#FunctionVisitor.switchContext">switchContext</a></td>
<td>Public method implementing a context switcher as a generic function visitor in order to track function context.</td>
</tr>
</table>
<h3>Static Methods</h3>

<table>
<tr><td>None</td></tr>
</table>

<a NAME="FunctionVisitor.__init__" ID="FunctionVisitor.__init__"></a>
<h4>FunctionVisitor (Constructor)</h4>
<b>FunctionVisitor</b>(<i>lines</i>)

<p>
        Constructor
</p>
<dl>

<dt><i>lines</i> (list of str)</dt>
<dd>
source code lines of the function
</dd>
</dl>
<a NAME="FunctionVisitor.switchContext" ID="FunctionVisitor.switchContext"></a>
<h4>FunctionVisitor.switchContext</h4>
<b>switchContext</b>(<i>node</i>)

<p>
        Public method implementing a context switcher as a generic function
        visitor in order to track function context.
</p>
<p>
        Without keeping track of context, it's challenging to reliably
        differentiate class methods from "regular" functions, especially in the
        case of nested classes.
</p>
<dl>

<dt><i>node</i> (ast.AsyncFunctionDef or ast.FunctionDef)</dt>
<dd>
reference to the function definition node to be analyzed
</dd>
</dl>
<div align="right"><a href="#top">Up</a></div>
<hr />
<hr />
<a NAME="ReturnVisitor" ID="ReturnVisitor"></a>
<h2>ReturnVisitor</h2>

<p>
    Class implementing a node visitor to check the return statements of a
    function node.
</p>
<p>
    If the function node being visited has an explicit return statement of
    anything other than `None`, the `instance.hasOnlyNoneReturns` flag will
    be set to `False`.
</p>
<p>
    If the function node being visited has no return statement, or contains
    only return statement(s) that explicitly return `None`, the
    `instance.hasOnlyNoneReturns` flag will be set to `True`.
</p>
<p>
    Due to the generic visiting being done, we need to keep track of the
    context in which a non-`None` return node is found. These functions are
    added to a set that is checked to see whether nor not the parent node is
    present.
</p>
<h3>Derived from</h3>
ast.NodeVisitor
<h3>Class Attributes</h3>

<table>
<tr><td>visit_AsyncFunctionDef</td></tr><tr><td>visit_FunctionDef</td></tr>
</table>
<h3>Class Methods</h3>

<table>
<tr><td>None</td></tr>
</table>
<h3>Methods</h3>

<table>

<tr>
<td><a href="#ReturnVisitor.__init__">ReturnVisitor</a></td>
<td>Constructor</td>
</tr>
<tr>
<td><a href="#ReturnVisitor.hasOnlyNoneReturns">hasOnlyNoneReturns</a></td>
<td>Public method indicating, that the parent node isn't in the visited nodes that don't return `None`.</td>
</tr>
<tr>
<td><a href="#ReturnVisitor.switchContext">switchContext</a></td>
<td>Public method implementing a context switcher as a generic function visitor in order to track function context.</td>
</tr>
<tr>
<td><a href="#ReturnVisitor.visit_Return">visit_Return</a></td>
<td>Public method to check each Return node to see if it returns anything other than `None`.</td>
</tr>
</table>
<h3>Static Methods</h3>

<table>
<tr><td>None</td></tr>
</table>

<a NAME="ReturnVisitor.__init__" ID="ReturnVisitor.__init__"></a>
<h4>ReturnVisitor (Constructor)</h4>
<b>ReturnVisitor</b>(<i>parentNode</i>)

<p>
        Constructor
</p>
<dl>

<dt><i>parentNode</i> (ast.AsyncFunctionDef or ast.FunctionDef)</dt>
<dd>
reference to the function definition node to be
            analyzed
</dd>
</dl>
<a NAME="ReturnVisitor.hasOnlyNoneReturns" ID="ReturnVisitor.hasOnlyNoneReturns"></a>
<h4>ReturnVisitor.hasOnlyNoneReturns</h4>
<b>hasOnlyNoneReturns</b>(<i></i>)

<p>
        Public method indicating, that the parent node isn't in the visited
        nodes that don't return `None`.
</p>
<dl>
<dt>Return:</dt>
<dd>
flag indicating, that the parent node isn't in the visited
            nodes that don't return `None`
</dd>
</dl>
<dl>
<dt>Return Type:</dt>
<dd>
bool
</dd>
</dl>
<a NAME="ReturnVisitor.switchContext" ID="ReturnVisitor.switchContext"></a>
<h4>ReturnVisitor.switchContext</h4>
<b>switchContext</b>(<i>node</i>)

<p>
        Public method implementing a context switcher as a generic function
        visitor in order to track function context.
</p>
<p>
        Without keeping track of context, it's challenging to reliably
        differentiate class methods from "regular" functions, especially in the
        case of nested classes.
</p>
<dl>

<dt><i>node</i> (ast.AsyncFunctionDef or ast.FunctionDef)</dt>
<dd>
reference to the function definition node to be analyzed
</dd>
</dl>
<a NAME="ReturnVisitor.visit_Return" ID="ReturnVisitor.visit_Return"></a>
<h4>ReturnVisitor.visit_Return</h4>
<b>visit_Return</b>(<i>node</i>)

<p>
        Public method to check each Return node to see if it returns anything
        other than `None`.
</p>
<p>
        If the node being visited returns anything other than `None`, its
        parent context is added to the set of non-returning child nodes of
        the parent node.
</p>
<dl>

<dt><i>node</i> (ast.Return)</dt>
<dd>
reference to the AST Return node
</dd>
</dl>
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