python - Finding qualified names that reference a given object -

for debugging purposes, want obtain names under given object known; want qualified names (i.e., a.x rather x). here's our first attempt:

import gc, sys def find_names(obj):     result = []     referrer in gc.get_referrers(obj):         if isinstance(referrer, dict):             k in referrer:                 if referrer[k] obj:                     n = '???'                     f in ('__qualname__', '__name__'):                         if f in referrer:                             n = referrer[f]                     result.append('{}.{}'.format(n, k))     return ','.join(result) 

the problem cannot find "name" of container container unless container __dict__ of class or module (then __qualname__ or __name__ work). don't know why __class__ not part of instance's __dict__ (is stored in slots?), reason doesn't matter - matters can't it.

is there can work follows:

class a:     pass = a() a.x = object() find_names(a.x) # want return `a.x` rather `???.x` 

i think can checking referrers of referrer corresponds instance, , looking 1 __dict__ identical original referrer:

def find_names(obj):     result = []     referrer in gc.get_referrers(obj):         if isinstance(referrer, dict):             k in referrer:                 if referrer[k] obj:                     n = '???'                     f in ('__qualname__', '__name__'):                         if f in referrer:                             n = referrer[f]                             break                     if n == '???':                         parents = gc.get_referrers(referrer)                         p in parents:                             if getattr(p, '__dict__', none) referrer:                                 n = '<instance of class ' + p.__class__.__name__ + '>'                     result.append(str(n) + '.' + str(k))     return '\n'.join(sorted(result))