mixed.py 文件源码

def find_syntax_node_name(evaluator, python_object):
    try:
        python_object = _get_object_to_check(python_object)
        path = inspect.getsourcefile(python_object)
    except TypeError:
        # The type might not be known (e.g. class_with_dict.__weakref__)
        return None, None
    if path is None or not os.path.exists(path):
        # The path might not exist or be e.g. <stdin>.
        return None, None

    module = _load_module(evaluator, path, python_object)

    if inspect.ismodule(python_object):
        # We don't need to check names for modules, because there's not really
        # a way to write a module in a module in Python (and also __name__ can
        # be something like ``email.utils``).
        return module, path

    try:
        name_str = python_object.__name__
    except AttributeError:
        # Stuff like python_function.__code__.
        return None, None

    if name_str == '<lambda>':
        return None, None  # It's too hard to find lambdas.

    # Doesn't always work (e.g. os.stat_result)
    try:
        names = module.get_used_names()[name_str]
    except KeyError:
        return None, None
    names = [n for n in names if n.is_definition()]

    try:
        code = python_object.__code__
        # By using the line number of a code object we make the lookup in a
        # file pretty easy. There's still a possibility of people defining
        # stuff like ``a = 3; foo(a); a = 4`` on the same line, but if people
        # do so we just don't care.
        line_nr = code.co_firstlineno
    except AttributeError:
        pass
    else:
        line_names = [name for name in names if name.start_pos[0] == line_nr]
        # There's a chance that the object is not available anymore, because
        # the code has changed in the background.
        if line_names:
            return line_names[-1].parent, path

    # It's really hard to actually get the right definition, here as a last
    # resort we just return the last one. This chance might lead to odd
    # completions at some points but will lead to mostly correct type
    # inference, because people tend to define a public name in a module only
    # once.
    return names[-1].parent, path