Привет двач

import sys
from importlib import import_module


def get_possibles(dots):
    yield 'builtins', None, dots
    for i, _ in enumerate(dots):
        pkg = dots[:i]
        if not pkg:
            pkg = None
        yield dots[i], pkg, dots[i + 1:]


def descend(o, path):
    for p in path:
        o = getattr(o, p)
    return o


for mod, pkg, ga in get_possibles(sys.argv[-1].split('.')):
    try:
        o = import_module(mod, pkg)
    except ImportError:
        continue
    try:
        o = descend(o, ga)
    except AttributeError:
        continue
    help(o)
    break
else:
    print('Not found', file=sys.stderr)
    exit(1)