test_warnings.py 文件源码

def visit_Call(self, node):
            p = ParseCall()
            p.visit(node.func)
            ast.NodeVisitor.generic_visit(self, node)

            if p.ls[-1] == 'simplefilter' or p.ls[-1] == 'filterwarnings':
                if node.args[0].s == "ignore":
                    raise AssertionError(
                        "ignore filter should not be used; found in "
                        "{} on line {}".format(self.__filename, node.lineno))

            if p.ls[-1] == 'warn' and (
                    len(p.ls) == 1 or p.ls[-2] == 'warnings'):

                if "testing/tests/test_warnings.py" is self.__filename:
                    # This file
                    return

                # See if stacklevel exists:
                if len(node.args) == 3:
                    return
                args = {kw.arg for kw in node.keywords}
                if "stacklevel" in args:
                    return
                raise AssertionError(
                    "warnings should have an appropriate stacklevel; found in "
                    "{} on line {}".format(self.__filename, node.lineno))