列出python方法中的所有引用

import inspect

def foo():
    bar = 42
    print(bar)

references = [obj for obj in gc.get_referrers(foo) if inspect.isframe(obj)]
for ref in references:
    print(ref.f_globals['__name__'], ref.f_lineno, ref.f_code.co_name)

import gc

def foo():
    bar = 42
    print(bar)

references = [obj for obj in gc.get_referrers(foo) if isinstance(obj, dict)]
for ref in references:
    for key, value in ref.items():
        if value is foo:
            print(key)

import sys

def foo():
    bar = 42
    print(bar)

references = [obj for obj in sys.modules.values() if hasattr(obj, '__dict__') and 'foo' in obj.__dict__.values()]
for ref in references:
    print(ref.__name__)