frameinfo.py

import sys
import inspect


def wrap(func):
    attach()
    return func


def attach():
    frame = sys._getframe(2)
    info = inspect.getframeinfo(frame)
    # Python 3.7:  "@wrap"
    # Python 3.8:  "def a():"
    print(info.code_context[0])


@wrap
def a():
    pass