Range marker fails with decorators

Question

Original report by me.

Eg

def f():
    pass

该提问来源于开源项目：thonny/thonny

Answer 1

Another example

def string_required ( f ):
    def string_checked ( arg ):
        if type(arg) != str:
            raise ValueError(repr(arg) + "is not a string")
        return f(arg)
    return string_checked


def must_have_s (arg):
    print( len (arg), arg)