Python astroid.Instance方法代码示例

# 需要导入模块: import astroid [as 别名]
# 或者: from astroid import Instance [as 别名]
def lookup(node, name):
    """Lookup the given special method name in the given *node*

    If the special method was found, then a list of attributes
    will be returned. Otherwise, `astroid.AttributeInferenceError`
    is going to be raised.
    """
    if isinstance(node, (astroid.List,
                         astroid.Tuple,
                         astroid.Const,
                         astroid.Dict,
                         astroid.Set)):
        return _builtin_lookup(node, name)
    elif isinstance(node, astroid.Instance):
        return _lookup_in_mro(node, name)
    elif isinstance(node, astroid.ClassDef):
        return _class_lookup(node, name)

    raise exceptions.AttributeInferenceError(
        attribute=name,
        target=node
    ) 

# 需要导入模块: import astroid [as 别名]
# 或者: from astroid import Instance [as 别名]
def visit_tuple(self, tuple_node):
        if PY3K or not tuple_node.elts:
            self._checker.add_message('raising-bad-type',
                                      node=self._node,
                                      args='tuple')
            return

        # On Python 2, using the following is not an error:
        #    raise (ZeroDivisionError, None)
        #    raise (ZeroDivisionError, )
        # What's left to do is to check that the first
        # argument is indeed an exception. Verifying the other arguments
        # is not the scope of this check.
        first = tuple_node.elts[0]
        inferred = utils.safe_infer(first)
        if not inferred or inferred is astroid.Uninferable:
            return

        if (isinstance(inferred, astroid.Instance)
                and inferred.__class__.__name__ != 'Instance'):
            # TODO: explain why
            self.visit_default(tuple_node)
        else:
            self.visit(inferred) 

# 需要导入模块: import astroid [as 别名]
# 或者: from astroid import Instance [as 别名]
def visit_attribute(self, node):
        """Look for removed attributes"""
        if node.attrname == 'xreadlines':
            self.add_message('xreadlines-attribute', node=node)
            return

        exception_message = 'message'
        try:
            for inferred in node.expr.infer():
                if (isinstance(inferred, astroid.Instance) and
                        utils.inherit_from_std_ex(inferred)):
                    if node.attrname == exception_message:

                        # Exceptions with .message clearly defined are an exception
                        if exception_message in inferred.instance_attrs:
                            continue
                        self.add_message('exception-message-attribute', node=node)
                if isinstance(inferred, astroid.Module):
                    self._warn_if_deprecated(node, inferred.name, {node.attrname},
                                             report_on_modules=False)
        except astroid.InferenceError:
            return 

# 需要导入模块: import astroid [as 别名]
# 或者: from astroid import Instance [as 别名]
def is_method_call(func, types=(), methods=()):
    """Determines if a BoundMethod node represents a method call.

    Args:
      func (astroid.BoundMethod): The BoundMethod AST node to check.
      types (Optional[String]): Optional sequence of caller type names to restrict check.
      methods (Optional[String]): Optional sequence of method names to restrict check.

    Returns:
      bool: true if the node represents a method call for the given type and
      method names, False otherwise.
    """
    return (isinstance(func, astroid.BoundMethod)
            and isinstance(func.bound, astroid.Instance)
            and (func.bound.name in types if types else True)
            and (func.name in methods if methods else True)) 

# 需要导入模块: import astroid [as 别名]
# 或者: from astroid import Instance [as 别名]
def _has_data_descriptor(cls, attr):
    attributes = cls.getattr(attr)
    for attribute in attributes:
        try:
            for inferred in attribute.infer():
                if isinstance(inferred, astroid.Instance):
                    try:
                        inferred.getattr('__get__')
                        inferred.getattr('__set__')
                    except astroid.NotFoundError:
                        continue
                    else:
                        return True
        except astroid.InferenceError:
            # Can't infer, avoid emitting a false positive in this case.
            return True
    return False 

# 需要导入模块: import astroid [as 别名]
# 或者: from astroid import Instance [as 别名]
def _check_proper_bases(self, node):
        """
        Detect that a class inherits something which is not
        a class or a type.
        """
        for base in node.bases:
            ancestor = safe_infer(base)
            if ancestor in (astroid.YES, None):
                continue
            if (isinstance(ancestor, astroid.Instance) and
                    ancestor.is_subtype_of('%s.type' % (BUILTINS,))):
                continue

            if (not isinstance(ancestor, astroid.ClassDef) or
                    _is_invalid_base_class(ancestor)):
                self.add_message('inherit-non-class',
                                 args=base.as_string(), node=node) 

# 需要导入模块: import astroid [as 别名]
# 或者: from astroid import Instance [as 别名]
def _is_iterator(node):
        if node is astroid.YES:
            # Just ignore YES objects.
            return True
        if isinstance(node, Generator):
            # Generators can be itered.
            return True

        if isinstance(node, astroid.Instance):
            try:
                node.local_attr(NEXT_METHOD)
                return True
            except astroid.NotFoundError:
                pass
        elif isinstance(node, astroid.ClassDef):
            metaclass = node.metaclass()
            if metaclass and isinstance(metaclass, astroid.ClassDef):
                try:
                    metaclass.local_attr(NEXT_METHOD)
                    return True
                except astroid.NotFoundError:
                    pass
        return False 

# 需要导入模块: import astroid [as 别名]
# 或者: from astroid import Instance [as 别名]
def lookup(node, name):
    """Lookup the given special method name in the given *node*

    If the special method was found, then a list of attributes
    will be returned. Otherwise, `astroid.AttributeInferenceError`
    is going to be raised.
    """
    if isinstance(
        node, (astroid.List, astroid.Tuple, astroid.Const, astroid.Dict, astroid.Set)
    ):
        return _builtin_lookup(node, name)
    if isinstance(node, astroid.Instance):
        return _lookup_in_mro(node, name)
    if isinstance(node, astroid.ClassDef):
        return _class_lookup(node, name)

    raise exceptions.AttributeInferenceError(attribute=name, target=node) 

# 需要导入模块: import astroid [as 别名]
# 或者: from astroid import Instance [as 别名]
def test_pylint_config_attr():
    mod = astroid.MANAGER.ast_from_module_name("pylint.lint")
    pylinter = mod["PyLinter"]
    expect = [
        "OptionsManagerMixIn",
        "object",
        "MessagesHandlerMixIn",
        "ReportsHandlerMixIn",
        "BaseTokenChecker",
        "BaseChecker",
        "OptionsProviderMixIn",
    ]
    assert [c.name for c in pylinter.ancestors()] == expect
    assert list(astroid.Instance(pylinter).getattr("config"))
    inferred = list(astroid.Instance(pylinter).igetattr("config"))
    assert len(inferred) == 1
    assert inferred[0].root().name == "optparse"
    assert inferred[0].name == "Values" 

# 需要导入模块: import astroid [as 别名]
# 或者: from astroid import Instance [as 别名]
def visit_tuple(self, tuple_node):
        if PY3K or not tuple_node.elts:
            self._checker.add_message("raising-bad-type", node=self._node, args="tuple")
            return

        # On Python 2, using the following is not an error:
        #    raise (ZeroDivisionError, None)
        #    raise (ZeroDivisionError, )
        # What's left to do is to check that the first
        # argument is indeed an exception. Verifying the other arguments
        # is not the scope of this check.
        first = tuple_node.elts[0]
        inferred = utils.safe_infer(first)
        if not inferred or inferred is astroid.Uninferable:
            return

        if (
            isinstance(inferred, astroid.Instance)
            and inferred.__class__.__name__ != "Instance"
        ):
            # TODO: explain why
            self.visit_default(tuple_node)
        else:
            self.visit(inferred) 

# 需要导入模块: import astroid [as 别名]
# 或者: from astroid import Instance [as 别名]
def visit_attribute(self, node):
        """Look for removed attributes"""
        if node.attrname == "xreadlines":
            self.add_message("xreadlines-attribute", node=node)
            return

        exception_message = "message"
        try:
            for inferred in node.expr.infer():
                if isinstance(inferred, astroid.Instance) and utils.inherit_from_std_ex(
                    inferred
                ):
                    if node.attrname == exception_message:

                        # Exceptions with .message clearly defined are an exception
                        if exception_message in inferred.instance_attrs:
                            continue
                        self.add_message("exception-message-attribute", node=node)
                if isinstance(inferred, astroid.Module):
                    self._warn_if_deprecated(
                        node, inferred.name, {node.attrname}, report_on_modules=False
                    )
        except astroid.InferenceError:
            return 

# 需要导入模块: import astroid [as 别名]
# 或者: from astroid import Instance [as 别名]
def is_method_call(func, types=(), methods=()):
    """Determines if a BoundMethod node represents a method call.

    Args:
      func (astroid.BoundMethod): The BoundMethod AST node to check.
      types (Optional[String]): Optional sequence of caller type names to restrict check.
      methods (Optional[String]): Optional sequence of method names to restrict check.

    Returns:
      bool: true if the node represents a method call for the given type and
      method names, False otherwise.
    """
    return (
        isinstance(func, astroid.BoundMethod)
        and isinstance(func.bound, astroid.Instance)
        and (func.bound.name in types if types else True)
        and (func.name in methods if methods else True)
    ) 

# 需要导入模块: import astroid [as 别名]
# 或者: from astroid import Instance [as 别名]
def _has_data_descriptor(cls, attr):
    attributes = cls.getattr(attr)
    for attribute in attributes:
        try:
            for inferred in attribute.infer():
                if isinstance(inferred, astroid.Instance):
                    try:
                        inferred.getattr("__get__")
                        inferred.getattr("__set__")
                    except astroid.NotFoundError:
                        continue
                    else:
                        return True
        except astroid.InferenceError:
            # Can't infer, avoid emitting a false positive in this case.
            return True
    return False 

# 需要导入模块: import astroid [as 别名]
# 或者: from astroid import Instance [as 别名]
def _check_proper_bases(self, node):
        """
        Detect that a class inherits something which is not
        a class or a type.
        """
        for base in node.bases:
            ancestor = safe_infer(base)
            if ancestor in (astroid.Uninferable, None):
                continue
            if isinstance(ancestor, astroid.Instance) and ancestor.is_subtype_of(
                "%s.type" % (BUILTINS,)
            ):
                continue

            if not isinstance(ancestor, astroid.ClassDef) or _is_invalid_base_class(
                ancestor
            ):
                self.add_message("inherit-non-class", args=base.as_string(), node=node)

            if ancestor.name == object.__name__:
                self.add_message(
                    "useless-object-inheritance", args=node.name, node=node
                ) 

# 需要导入模块: import astroid [as 别名]
# 或者: from astroid import Instance [as 别名]
def _is_iterator(node):
        if node is astroid.Uninferable:
            # Just ignore Uninferable objects.
            return True
        if isinstance(node, Generator):
            # Generators can be itered.
            return True

        if isinstance(node, astroid.Instance):
            try:
                node.local_attr(NEXT_METHOD)
                return True
            except astroid.NotFoundError:
                pass
        elif isinstance(node, astroid.ClassDef):
            metaclass = node.metaclass()
            if metaclass and isinstance(metaclass, astroid.ClassDef):
                try:
                    metaclass.local_attr(NEXT_METHOD)
                    return True
                except astroid.NotFoundError:
                    pass
        return False