我下载了Cython并运行：
sudo python setup.py install
我收到以下错误：
Unable to find pgen, not compiling formal grammar.
running install
Traceback (most recent call last):
File "setup.py", line 357, in <module>
**setup_args
File "/usr/lib/python2.7/distutils/core.py", line 151, in setup
dist.run_commands()
File "/usr/lib/python2.7/distutils/dist.py", line 953, in run_commands
self.run_command(cmd)
File "/usr/lib/python2.7/distutils/dist.py", line 972, in run_command
cmd_obj.run()
File "/usr/local/lib/python2.7/dist-packages/setuptools/command/install.py", line 67, in run
self.do_egg_install()
File "/usr/local/lib/python2.7/dist-packages/setuptools/command/install.py", line 98, in do_egg_install
easy_install = self.distribution.get_command_class('easy_install')
File "/usr/local/lib/python2.7/dist-packages/setuptools/dist.py", line 388, in get_command_class
self.cmdclass[command] = cmdclass = ep.load()
File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 2088, in load
entry = __import__(self.module_name, globals(),globals(), ['__name__'])
File "/usr/local/lib/python2.7/dist-packages/setuptools/command/easy_install.py", line 42, in <module>
from setuptools.archive_util import unpack_archive
File "/usr/local/lib/python2.7/dist-packages/setuptools/archive_util.py", line 15, in <module>
from pkg_resources import ensure_directory, ContextualZipFile
ImportError: cannot import name ContextualZipFile
使用pip install安装时也会出现同样的错误。