在我的Mac OSX计算机上，我无法使用python2-7导入mpl_toolkits。我以为我可以通过升级matplotib来解决此问题。我尝试过
sudo pip install --U matplotlib
这是一个很长的错误消息，我将在此问题的最后显示。
然后，在百灵鸟上，我尝试放下sudo：
pip install --U matplotlib
失败并出现错误
Could not install packages due to an EnvironmentError: [Errno 13] Permission denied: '/Library/Python/2.7/site-packages/kiwisolver.so'
Consider using the `--user` option or check the permissions.
到底是什么？我认为。我会再给sudo一个尝试。失败并出现新错误：
Found existing installation: six 1.4.1
Cannot uninstall 'six'. It is a distutils installed project and thus we cannot accurately determine which files belong to it which would lead to only a partial uninstall.
现在这才是真正的关键：我再也无法导入matplotlib：
>>> import matplotlib
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/matplotlib/__init__.py", line 125, in <module>
raise ImportError("matplotlib requires pyparsing")
ImportError: matplotlib requires pyparsing
那么，谁能告诉我至少如何回到可用的matplotlib？以及如何更新它并使用mpl_toolkits也是不错的选择。
顺便说一句，我提到的那个长错误是：
Installing collected packages: setuptools, kiwisolver, six, cycler, subprocess32, pytz, backports.functools-lru-cache, numpy, pyparsing, python-dateutil, matplotlib
Found existing installation: setuptools 18.5
Uninstalling setuptools-18.5:
Exception:
Traceback (most recent call last):
File "/Library/Python/2.7/site-packages/pip/basecommand.py", line 215, in main
status = self.run(options, args)
File "/Library/Python/2.7/site-packages/pip/commands/install.py", line 342, in run
prefix=options.prefix_path,
File "/Library/Python/2.7/site-packages/pip/req/req_set.py", line 778, in install
requirement.uninstall(auto_confirm=True)
File "/Library/Python/2.7/site-packages/pip/req/req_install.py", line 754, in uninstall
paths_to_remove.remove(auto_confirm)
File "/Library/Python/2.7/site-packages/pip/req/req_uninstall.py", line 115, in remove
renames(path, new_path)
File "/Library/Python/2.7/site-packages/pip/utils/__init__.py", line 267, in renames
shutil.move(old, new)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py", line 299, in move
copytree(src, real_dst, symlinks=True)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py", line 208, in copytree
raise Error, errors
Error: [('/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/_markerlib/markers.pyc', '/tmp/pip-4yz1zL-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/_markerlib/markers.pyc', "[Errno 1] Operation not permitted: '/tmp/pip-4yz1zL-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/_markerlib/markers.pyc'"), ('/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/_markerlib/__init__.py', '/tmp/pip-4yz1zL-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/_markerlib/__init__.py', "[Errno 1] Operation not permitted: '/tmp/pip-4yz1zL-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/_markerlib/__init__.py'"), ('/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/_markerlib/markers.py', '/tmp/pip-4yz1zL-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/_markerlib/markers.py', "[Errno 1] Operation not permitted: '/tmp/pip-4yz1zL-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/_markerlib/markers.py'"), ('/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/_markerlib/__init__.pyc', '/tmp/pip-4yz1zL-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/_markerlib/__init__.pyc', "[Errno 1] Operation not permitted: '/tmp/pip-4yz1zL-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/_markerlib/__init__.pyc'"), ('/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/_markerlib', '/tmp/pip-4yz1zL-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/_markerlib', "[Errno 1] Operation not permitted: '/tmp/pip-4yz1zL-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/_markerlib'")]