ast.py 文件源码

def __init__(self, code, **exception_kwargs):
        self.codeargs = []
        self.args = []
        self.declared_identifiers = set()
        self.undeclared_identifiers = set()
        if isinstance(code, compat.string_types):
            if re.match(r"\S", code) and not re.match(r",\s*$", code):
                # if theres text and no trailing comma, insure its parsed
                # as a tuple by adding a trailing comma
                code += ","
            expr = pyparser.parse(code, "exec", **exception_kwargs)
        else:
            expr = code

        f = pyparser.FindTuple(self, PythonCode, **exception_kwargs)
        f.visit(expr)