debug.py 文件源码

def searchRefs(obj, *args):
    """Pseudo-interactive function for tracing references backward.
    **Arguments:**

        obj:   The initial object from which to start searching
        args:  A set of string or int arguments.
               each integer selects one of obj's referrers to be the new 'obj'
               each string indicates an action to take on the current 'obj':
                  t:  print the types of obj's referrers
                  l:  print the lengths of obj's referrers (if they have __len__)
                  i:  print the IDs of obj's referrers
                  o:  print obj
                  ro: return obj
                  rr: return list of obj's referrers

    Examples::

       searchRefs(obj, 't')                    ## Print types of all objects referring to obj
       searchRefs(obj, 't', 0, 't')            ##   ..then select the first referrer and print the types of its referrers
       searchRefs(obj, 't', 0, 't', 'l')       ##   ..also print lengths of the last set of referrers
       searchRefs(obj, 0, 1, 'ro')             ## Select index 0 from obj's referrer, then select index 1 from the next set of referrers, then return that object

    """
    ignore = {id(sys._getframe()): None}
    gc.collect()
    refs = gc.get_referrers(obj)
    ignore[id(refs)] = None
    refs = [r for r in refs if id(r) not in ignore]
    for a in args:

        #fo = allFrameObjs()
        #refs = [r for r in refs if r not in fo]

        if type(a) is int:
            obj = refs[a]
            gc.collect()
            refs = gc.get_referrers(obj)
            ignore[id(refs)] = None
            refs = [r for r in refs if id(r) not in ignore]
        elif a == 't':
            print(list(map(typeStr, refs)))
        elif a == 'i':
            print(list(map(id, refs)))
        elif a == 'l':
            def slen(o):
                if hasattr(o, '__len__'):
                    return len(o)
                else:
                    return None
            print(list(map(slen, refs)))
        elif a == 'o':
            print(obj)
        elif a == 'ro':
            return obj
        elif a == 'rr':
            return refs