OS X上的Python 2.7：TypeError：’frozenset’对象在每个命令上都不可调用

Python 2.7 on OS X: TypeError: 'frozenset' object is not callable on each command

我在Python的每个命令上都有这个错误：

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? /tmp sudo easy_install pip
Traceback (most recent call last):
File"/usr/bin/easy_install-2.7", line 11, in
load_entry_point('setuptools==1.1.6', 'console_scripts', 'easy_install')()
File"/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources.py", line 357, in load_entry_point
return get_distribution(dist).load_entry_point(group, name)
File"/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources.py", line 2394, in load_entry_point
return ep.load()
File"/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources.py", line 2108, in load
entry = __import__(self.module_name, globals(),globals(), ['__name__'])
File"/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/setuptools/__init__.py", line 11, in
from setuptools.extension import Extension
File"/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/setuptools/extension.py", line 5, in
from setuptools.dist import _get_unpatched
File"/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/setuptools/dist.py", line 15, in
from setuptools.compat import numeric_types, basestring
File"/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/setuptools/compat.py", line 17, in
import httplib
File"/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/httplib.py", line 80, in
import mimetools
File"/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/mimetools.py", line 6, in
import tempfile
File"/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/tempfile.py", line 35, in
from random import Random as _Random
File"/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/random.py", line 49, in
import hashlib as _hashlib
File"build/bdist.macosx-10.11-intel/egg/hashlib.py", line 115, in
"""
TypeError: 'frozenset' object is not callable

我该怎么办？