Python astroid.Const方法代码示例

# 需要导入模块: import astroid [as 别名]
# 或者: from astroid import Const [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 Const [as 别名]
def returns_something(return_node):
    """Check if a return node returns a value other than None.

    :param return_node: The return node to check.
    :type return_node: astroid.Return

    :rtype: bool
    :return: True if the return node returns a value other than None,
        False otherwise.
    """
    returns = return_node.value

    if returns is None:
        return False

    return not (isinstance(returns, astroid.Const) and returns.value is None) 

# 需要导入模块: import astroid [as 别名]
# 或者: from astroid import Const [as 别名]
def _check_bad_exception_context(self, node):
        """Verify that the exception context is properly set.

        An exception context can be only `None` or an exception.
        """
        cause = utils.safe_infer(node.cause)
        if cause in (astroid.YES, None):
            return

        if isinstance(cause, astroid.Const):
            if cause.value is not None:
                self.add_message('bad-exception-context',
                                 node=node)
        elif (not isinstance(cause, astroid.ClassDef) and
              not utils.inherit_from_std_ex(cause)):
            self.add_message('bad-exception-context',
                             node=node) 

# 需要导入模块: import astroid [as 别名]
# 或者: from astroid import Const [as 别名]
def _check_using_constant_test(self, node, test):
        const_nodes = (
            astroid.Module,
            astroid.scoped_nodes.GeneratorExp,
            astroid.Lambda, astroid.FunctionDef, astroid.ClassDef,
            astroid.bases.Generator, astroid.UnboundMethod,
            astroid.BoundMethod, astroid.Module)
        structs = (astroid.Dict, astroid.Tuple, astroid.Set)

        # These nodes are excepted, since they are not constant
        # values, requiring a computation to happen. The only type
        # of node in this list which doesn't have this property is
        # Attribute, which is excepted because the conditional statement
        # can be used to verify that the attribute was set inside a class,
        # which is definitely a valid use case.
        except_nodes = (astroid.Attribute, astroid.Call,
                        astroid.BinOp, astroid.BoolOp, astroid.UnaryOp,
                        astroid.Subscript)
        inferred = None
        emit = isinstance(test, (astroid.Const, ) + structs + const_nodes)
        if not isinstance(test, except_nodes):
            inferred = utils.safe_infer(test)

        if emit or isinstance(inferred, const_nodes):
            self.add_message('using-constant-test', node=node) 

# 需要导入模块: import astroid [as 别名]
# 或者: from astroid import Const [as 别名]
def visit_compare(self, node):
        self._check_unidiomatic_typecheck(node)
        # NOTE: this checker only works with binary comparisons like 'x == 42'
        # but not 'x == y == 42'
        if len(node.ops) != 1:
            return

        left = node.left
        operator, right = node.ops[0]
        if (operator in ('<', '<=', '>', '>=', '!=', '==')
                and isinstance(left, astroid.Const)):
            self._check_misplaced_constant(node, left, right, operator)

        if operator == '==':
            if isinstance(left, astroid.Const):
                self._check_singleton_comparison(left, node)
            elif isinstance(right, astroid.Const):
                self._check_singleton_comparison(right, node)
        if operator in ('is', 'is not'):
            self._check_literal_comparison(right, node) 

# 需要导入模块: import astroid [as 别名]
# 或者: from astroid import Const [as 别名]
def _check_len(self, node):
        inferred = _safe_infer_call_result(node, node)
        if not inferred or inferred is astroid.Uninferable:
            return

        if (isinstance(inferred, astroid.Instance)
                and inferred.name == 'int'
                and not isinstance(inferred, astroid.Const)):
            # Assume it's good enough, since the int() call might wrap
            # something that's uninferable for us
            return

        if not isinstance(inferred, astroid.Const):
            self.add_message('invalid-length-returned', node=node)
            return

        value = inferred.value
        if not isinstance(value, six.integer_types) or value < 0:
            self.add_message('invalid-length-returned', node=node) 

# 需要导入模块: import astroid [as 别名]
# 或者: from astroid import Const [as 别名]
def visit_call(self, node: NodeNG) -> None:
        """Called for every function call in the source code."""
        if not isinstance(node.func, astroid.Name):
            # It isn't a simple name, can't deduce what function it is.
            return

        if node.func.name not in self.TRANSLATION_FUNCTIONS:
            # Not a function we care about.
            return

        if not self.linter.is_message_enabled(self.MESSAGE_ID, line=node.fromlineno):
            return

        first = node.args[0]
        if isinstance(first, astroid.Const):
            if isinstance(first.value, six.string_types):
                # The first argument is a constant string! All is well!
                return

        # Bad!
        self.add_message(self.MESSAGE_ID, args=node.func.name, node=node) 

# 需要导入模块: import astroid [as 别名]
# 或者: from astroid import Const [as 别名]
def set_without_children(node):
    """Populate ending locations for nodes that are guaranteed to never have
    children. E.g. Const.

    These node's end_col_offset are currently assigned based on their
    computed string representation. This may differ from their actual
    source code representation, however (mainly whitespace).

    Precondition: `node` must not have a `last_child` (node).
    """
    if not hasattr(node, 'end_lineno'):
        node.end_lineno = node.fromlineno
    # FIXME: using the as_string() is a bad technique because many different
    # whitespace possibilities that may not be reflected in it!
    if not hasattr(node, 'end_col_offset'):
        node.end_col_offset = node.col_offset + len(node.as_string())
    return node 

# 需要导入模块: import astroid [as 别名]
# 或者: from astroid import Const [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 Const [as 别名]
def _check_bad_exception_context(self, node):
        """Verify that the exception context is properly set.

        An exception context can be only `None` or an exception.
        """
        cause = utils.safe_infer(node.cause)
        if cause in (astroid.Uninferable, None):
            return

        if isinstance(cause, astroid.Const):
            if cause.value is not None:
                self.add_message("bad-exception-context", node=node)
        elif not isinstance(cause, astroid.ClassDef) and not utils.inherit_from_std_ex(
            cause
        ):
            self.add_message("bad-exception-context", node=node) 

# 需要导入模块: import astroid [as 别名]
# 或者: from astroid import Const [as 别名]
def _check_simplifiable_ifexp(self, node):
        if not isinstance(node.body, astroid.Const) or not isinstance(
            node.orelse, astroid.Const
        ):
            return

        if not isinstance(node.body.value, bool) or not isinstance(
            node.orelse.value, bool
        ):
            return

        if isinstance(node.test, astroid.Compare):
            test_reduced_to = "test"
        else:
            test_reduced_to = "bool(test)"

        if (node.body.value, node.orelse.value) == (True, False):
            reduced_to = "'{}'".format(test_reduced_to)
        elif (node.body.value, node.orelse.value) == (False, True):
            reduced_to = "'not test'"
        else:
            return

        self.add_message("simplifiable-if-expression", node=node, args=(reduced_to,)) 

# 需要导入模块: import astroid [as 别名]
# 或者: from astroid import Const [as 别名]
def visit_compare(self, node):
        self._check_callable_comparison(node)
        self._check_logical_tautology(node)
        self._check_unidiomatic_typecheck(node)
        # NOTE: this checker only works with binary comparisons like 'x == 42'
        # but not 'x == y == 42'
        if len(node.ops) != 1:
            return

        left = node.left
        operator, right = node.ops[0]
        if operator in COMPARISON_OPERATORS and isinstance(left, astroid.Const):
            self._check_misplaced_constant(node, left, right, operator)

        if operator == "==":
            if isinstance(left, astroid.Const):
                self._check_singleton_comparison(left, node)
            elif isinstance(right, astroid.Const):
                self._check_singleton_comparison(right, node)
        if operator == "!=":
            if isinstance(right, astroid.Const):
                self._check_singleton_comparison(right, node, negative_check=True)
        if operator in ("is", "is not"):
            self._check_literal_comparison(right, node) 

# 需要导入模块: import astroid [as 别名]
# 或者: from astroid import Const [as 别名]
def _check_open_encoding(self, node):
        """Check that an open() call always has an encoding set."""
        try:
            mode_arg = utils.get_argument_from_call(node, position=1,
                                                    keyword='mode')
        except utils.NoSuchArgumentError:
            mode_arg = None
        _encoding = None
        try:
            _encoding = utils.get_argument_from_call(node, position=2)
        except utils.NoSuchArgumentError:
            try:
                _encoding = utils.get_argument_from_call(node,
                                                         keyword='encoding')
            except utils.NoSuchArgumentError:
                pass
        if _encoding is None:
            if mode_arg is None:
                mode = None
            else:
                mode = utils.safe_infer(mode_arg)
            if mode is not None and not isinstance(mode, astroid.Const):
                # We can't say what mode is exactly.
                return
            if mode is None:
                self.add_message('open-without-encoding', node=node)
            elif 'b' in getattr(mode, 'value', ''):
                # Files opened as binary don't need an encoding.
                return
            else:
                self.add_message('open-without-encoding', node=node) 

# 需要导入模块: import astroid [as 别名]
# 或者: from astroid import Const [as 别名]
def _is_constant_zero(node):
    return isinstance(node, astroid.Const) and node.value == 0 

# 需要导入模块: import astroid [as 别名]
# 或者: from astroid import Const [as 别名]
def _is_constant_empty_str(node):
    return isinstance(node, astroid.Const) and node.value == ''