ImportError：当我尝试通过 python pip 安装 Fabric 时，没有名为“pip._vendor.distlib.scripts”的模块

当我在CentOS4.9上运行此命令时，会发生这样的错误。我尝试在谷歌中搜索它但没有找到。看来我是第一个遇到这样问题的人。

# pip 安装结构

Traceback (most recent call last):
File "/usr/local/bin/pip", line 8, in <module>
load_entry_point('pip==7.0.1', 'console_scripts', 'pip')()
File "/usr/local/lib/python2.7/site-packages/setuptools-0.6c11-   py2.7.egg/pkg_resources.py", line 318, in load_entry_point
File "/usr/local/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg/pkg_resources.py", line 2221, in load_entry_point
File "/usr/local/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg/pkg_resources.py", line 1954, in load
File "/usr/local/lib/python2.7/site-packages/pip-7.0.1-py2.7.egg/pip/__init__.py", line 15, in <module>
from pip.vcs import git, mercurial, subversion, bazaar  # noqa
File "/usr/local/lib/python2.7/site-packages/pip-7.0.1-py2.7.egg/pip/vcs/subversion.py", line 9, in <module>
from pip.index import Link
File "/usr/local/lib/python2.7/site-packages/pip-7.0.1-py2.7.egg/pip/index.py", line 30, in <module>
from pip.wheel import Wheel, wheel_ext
File "/usr/local/lib/python2.7/site-packages/pip-7.0.1-py2.7.egg/pip/wheel.py", line 34, in <module>
from pip._vendor.distlib.scripts import ScriptMaker
File "/usr/local/lib/python2.7/site-packages/pip-7.0.1-py2.7.egg/pip/_vendor/__init__.py", line 92, in load_module
raise ImportError("No module named '%s'" % (name,))
ImportError: No module named 'pip._vendor.distlib.scripts'

我去了/usr/local/lib/python2.7/site-packages/pip-7.0.1-py2.7.egg/pip/_vendor/distlib。有scripts.py文件。

按照建议here https://superuser.com/a/918751/87805，尝试安装 SSL 支持。

在 CentOS 上：

yum install openssl openssl-devel

在 Debian 上：

apt-get -y install libssl-dev

If libssl-dev不存在，请尝试：openssl-dev.