Remove shadowsig, problem only solved by celery.contrib.sphinx anyway. …

…Closes #1865.

celery/app/base.py

@@ -33,7 +33,6 @@
 from celery.five import items, values
 from celery.loaders import get_loader_cls
 from celery.local import PromiseProxy, maybe_evaluate
-from celery.utils import shadowsig
 from celery.utils.functional import first, maybe_list
 from celery.utils.imports import instantiate, symbol_by_name
 from celery.utils.objects import mro_lookup
@@ -238,7 +237,6 @@ def _task_from_fun(self, fun, **options):
             '__doc__': fun.__doc__,
             '__module__': fun.__module__,
             '__wrapped__': fun}, **options))()
-        shadowsig(T, fun)  # for inspect.getargspec
         task = self._tasks[T.name]  # return global instance.
         return task
 

celery/utils/__init__.py

@@ -16,7 +16,7 @@
 import datetime
 
 from functools import partial, wraps
-from inspect import getargspec, ismethod
+from inspect import getargspec
 from pprint import pprint
 
 from kombu.entity import Exchange, Queue
@@ -344,17 +344,6 @@ def default_nodename(hostname):
     return nodename(name or NODENAME_DEFAULT, host or socket.gethostname())
 
 
-def shadowsig(wrapper, wrapped):
-    if ismethod(wrapped):
-        wrapped = wrapped.__func__
-    wrapper.__code__ = wrapped.__code__
-    wrapper.__defaults__ = wrapper.func_defaults = wrapped.__defaults__
-
-    if not PY3:
-        wrapper.func_code = wrapper.__code__
-        wrapper.func_defaults = wrapper.__defaults__
-
-
 # ------------------------------------------------------------------------ #
 # > XXX Compat
 from .log import LOG_LEVELS     # noqa