在全新安装的ActivePython-2.6中，pip出现导入错误

Question

我在虚拟机上安装了Cent OS，系统自带的是Python 2.4。因为我需要用到Python 2.6，所以我从ActivePython安装了一个单独的Python版本，它被安装在了不同的文件夹里。当我运行pip（/opt/ActivePython-2.6/bin/pip）的时候，出现了一个错误：

# pip
Traceback (most recent call last):
  File "/opt/ActivePython-2.6/bin/pip", line 9, in <module>
    load_entry_point('pip==0.8.1', 'console_scripts', 'pip')()
  File "/opt/ActivePython-2.6/lib/python2.6/site-packages/pkg_resources.py", line 305, in load_entry_point
    return get_distribution(dist).load_entry_point(group, name)
  File "/opt/ActivePython-2.6/lib/python2.6/site-packages/pkg_resources.py", line 2244, in load_entry_point
    return ep.load()
  File "/opt/ActivePython-2.6/lib/python2.6/site-packages/pkg_resources.py", line 1954, in load
    entry = __import__(self.module_name, globals(),globals(), ['__name__'])
  File "/opt/ActivePython-2.6/lib/python2.6/site-packages/pip/__init__.py", line 10, in <module>
    from pip.basecommand import command_dict, load_command, load_all_commands, command_names
  File "/opt/ActivePython-2.6/lib/python2.6/site-packages/pip/basecommand.py", line 11, in <module>
    import urllib2
  File "/opt/ActivePython-2.6/lib/python2.6/urllib2.py", line 93, in <module>
        import hashlib
  File "/opt/ActivePython-2.6/lib/python2.6/hashlib.py", line 136, in <module>
    md5 = __get_builtin_constructor('md5')
  File "/opt/ActivePython-2.6/lib/python2.6/hashlib.py", line 63, in __get_builtin_constructor
    import _md5
ImportError: No module named _md5

我从来没有见过这个错误，也不明白为什么它会试图调用叫做_md5的东西，而库的名字明明是'md5'。我尝试把_md5.py链接到md5.py，但结果还是出现了同样的错误，只是这次是ImportError: No module named _md5。

Answer 1

在 /opt/ActivePython-2.6 这个文件夹里找到 _md5.so 文件，然后对它运行 ldd 命令。没错，就是这样。

安装 EPEL，然后通过 yum 安装 python26，祝你玩得开心。