无法使用easy_install安装Python模块
我正在尝试使用 easy_install 来安装一个叫做 requests 的模块，方法是这样做：
easy_install requests
一周前我用的是 Python 2.6.5，这个方法运行得很好。但今天我安装了 Python 2.7.2，然后在我的一个脚本中尝试 import requests，结果失败了。于是我又尝试用 easy_install requests 重新安装 requests，但出现了这个错误：
install_dir /usr/local/lib/python2.6/dist-packages/
error: can't create or remove files in install directory
The following error occurred while trying to add or remove files in the
installation directory:
[Errno 13] Permission denied: '/usr/local/lib/python2.6/dist-packages/test-easy-install-15207.pth'
The installation directory you specified (via --install-dir, --prefix, or
the distutils default setting) was:
/usr/local/lib/python2.6/dist-packages/
Perhaps your account does not have write access to this directory? If the
installation directory is a system-owned directory, you may need to sign in
as the administrator or "root" account. If you do not have administrative
access to this machine, you may wish to choose a different installation
directory, preferably one that is listed in your PYTHONPATH environment
variable.
For information on other options, you may wish to consult the
documentation at:
http://packages.python.org/distribute/easy_install.html
Please make the appropriate changes for your system and try again.
有人告诉我去重新安装 easy_install，于是我去了 http://pypi.python.org/pypi/setuptools，了解到我需要：
首先，删除你系统的 site-packages 目录下的所有 setuptools*.egg 和 setuptools.pth 文件（还有其他 sys.path 目录中的文件）。
我照做了。然后我从 setuptools-0.6c11-py2.7.egg 重新安装了 setuptools。看起来安装成功了，但当我运行 easy_install requests 时，基本上还是出现了同样的错误，只不过目录从 python2.6/dist-packages 变成了 python2.7/site-packages。
siddhion@siddhion-laptop:~$ easy_install requests
error: can't create or remove files in install directory
The following error occurred while trying to add or remove files in the
installation directory:
[Errno 13] Permission denied: '/usr/local/lib/python2.7/site-packages/test-easy-install-16253.write-test'
The installation directory you specified (via --install-dir, --prefix, or
the distutils default setting) was:
/usr/local/lib/python2.7/site-packages/
Perhaps your account does not have write access to this directory? If the
installation directory is a system-owned directory, you may need to sign in
as the administrator or "root" account. If you do not have administrative
access to this machine, you may wish to choose a different installation
directory, preferably one that is listed in your PYTHONPATH environment
variable.
For information on other options, you may wish to consult the
documentation at:
http://peak.telecommunity.com/EasyInstall.html
Please make the appropriate changes for your system and try again.
另外，当我按下 easy_install 并按下 tab 键时，出现了这些选项：
easy_install easy_install-2.6 easy_install-2.7
为什么会有 easy_install-2.6 呢？
还有
我该如何让 easy_install 再次工作？
6 个回答
以下内容是在我使用Ubuntu 12.10时有效的，首先安装了easy_install，然后再安装pip：
sudo apt-get install python-virtualenv
curl -O https://raw.github.com/pypa/pip/master/contrib/get-pip.py
sudo python get-pip.py
在基于包管理的Linux系统上，你应该使用virtualenv。这样可以确保你的Python脚本不会和其他软件包发生冲突，也不会影响到操作系统的包管理工具。
你试过像这样使用 sudo 吗？
sudo easy_install requests
或者你可以指定一个你有写权限的安装目录。
easy_install --install-dir=/home/foo/bar
不过其实你应该使用 PIP，而不是 easy_install。PIP 更好用，功能也更多。