Question

我想重新安装virtualenv。我成功地做了：

pip uninstall virtualenv

然后重新安装我试过：

pip install virtualenv

导致错误：error: /lib/python2.7/site-packages/virtualenv.py: Permission denied

所以我试过了：

sudo pip install virtualenv

导致错误：

Traceback (most recent call last):
  File "/usr/local/bin/pip", line 5, in <module>
     from pkg_resources import load_entry_point
ImportError: No module named pkg_resources

Q1：为什么sudo会导致这样的问题？我已经读过这个错误是由于没有正确安装setuptools引起的。但为什么只能用sudo命令？这会导致python在其他地方寻找其资源吗？

有关我的设置的一些细节：

我在MacOS 10.9.4上。

我不确定为什么，但我似乎在两个地方设置了python：

的/ usr /本地/ LIB /
- /usr/local/lib/python2.7 /
- /usr/local/lib/python3.3 /
/ lib中
- /lib/python2.7 /
- /lib/python3.3 /

Q2：为什么这两个位置？从我可以告诉pip和pip3在第二个位置安装东西。也许我有太多版本的python在运行？

下载来自交互式python控制台的sys.path打印：

['',
 '/lib/python2.7/site-packages/setuptools-5.4.1-py2.7.egg',
 '/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pip-1.4.1-py2.7.egg',
 '/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/Sphinx-1.2.2-py2.7.egg',
 '/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/Jinja2-2.7.2-py2.7.egg',
 '/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/docutils-0.11-py2.7.egg',
 '/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/Pygments-1.6-py2.7.egg',
 '/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/MarkupSafe-0.23-py2.7-macosx-10.9-x86_64.egg',
 '/usr/local/lib/python2.7/site-packages/pip-1.4.1-py2.7.egg',
 '/usr/local/lib/python2.7/site-packages/Sphinx-1.2.2-py2.7.egg',
 '/usr/local/lib/python2.7/site-packages/Jinja2-2.7.2-py2.7.egg',
 '/usr/local/lib/python2.7/site-packages/docutils-0.11-py2.7.egg',
 '/usr/local/lib/python2.7/site-packages/Pygments-1.6-py2.7.egg',
 '/usr/local/lib/python2.7/site-packages/MarkupSafe-0.23-py2.7-macosx-10.9-x86_64.egg',
 '/lib/python2.7/site-packages',
 '/lib/python2.3/site-packages',
 '/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python27.zip',
 '/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7',
 '/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-darwin',
 '/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac',
 '/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac/lib-scriptpackages',
 '/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk',
 '/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-old',
 '/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload',
 '/Users/david/Library/Python/2.7/lib/python/site-packages',
 '/Library/Python/2.7/site-packages',
 '/usr/local/lib/python2.7/site-packages',
 '/lib/python2.3/site-packages']

Answer 1

虽然我不确定我是否完全了解原始问题的来源（不知道Q1的答案），但我通过卸载/取消链接Python与Homebrew来修复它，然后重新设置所有内容关注THIS教程。我得到的主要教训是：

Macs已经安装了python版本。这就是/lib中有python安装的原因。我还在Homebrew中安装了python，它在/usr/local/lib/中创建了第二个安装。经过一段时间不小心我正在使用/安装包以跟上我。
virtualenv是一种很好的简单方法，用于本地化和隔离单个项目的版本和依赖需求。我推迟使用它，因为我认为它可能很复杂，但它不是，它可能会让我省去这个麻烦。

pip install和sudo在mac上

1 个答案: