我剛剛安裝了使用自制軟件的Python。我使用了命令brew install python（安裝XQuartz後，這是一個先決條件）。我不明白我通過自制軟件安裝Python
本頁面 - https://github.com/mxcl/homebrew/wiki/Homebrew-and-Python - 告訴我下面的：
問題
假設一個標準的家釀安裝，前綴將
/usr/local和酒窖將/usr/local/Cellar。Homebrew將Python安裝到Cellar，使用標準
./configure --prefix=#{prefix}。此設置：
- 的 「站點包」 文件夾作爲
/usr/local/Cellar/python/2.7.3/lib/python2.7/site-packages。- 「安裝腳本」文件夾爲
/usr/local/Cellar/python/2.7.3/bin。如果site-packages存在於Python的Cellar中，那麼用戶安裝的軟件包 將在Python更新之間被擦除。與安裝腳本相同， 還有一個額外的問題，即用戶必須手動將Python的cellar bin 文件夾添加到路徑中。
解決方案
家釀進行安裝，以解決這些問題 兩個動作。
首先，酒窖站點包文件夾被刪除，並創造了前綴一個符號鏈接
/usr/local/lib/python2.7/site-packages。 將允許網站包在Python更新之間保留，因爲 Homebrew對使用lib用於 用戶可安裝庫的某些語言進行了特殊處理。其次，編寫一個
distutils.cfg文件來將安裝腳本 文件夾設置爲/usr/local/share/python。用戶可以將/usr/local/share/python添加到PATH以獲取已安裝的腳本。
我不明白的是，讀行「的酒窖站點包文件夾被刪除，並且一個符號鏈接 /usr/local/lib/python2.7/site-packages在前綴被創建。」當我查看「前綴」 - 我瞭解的是'/ usr/local' - 我沒有看到符號鏈接。這個被引用的符號鏈接在哪裏？
一個我很困惑的原因是，當我運行pip install virtualenvwrapper我得到的輸出，告訴我：「需求已經滿足：virtualenv中克隆的/Library/Python/2.7/site-packages（從virtualenvwrapper）」 。我不明白/Library/Python/2.7/site-packages目錄的來源以及爲什麼它會被引用。
話雖如此，pip install virtualenvwrapper似乎完成沒有問題，並不需要sudo，我認爲這應該是使用自制軟件的安裝的優勢之一。的pip install virtualenvwrapper整個輸出爲：
Downloading/unpacking virtualenvwrapper
Running setup.py egg_info for package virtualenvwrapper
Downloading/unpacking virtualenv (from virtualenvwrapper)
Downloading virtualenv-1.8.2.tar.gz (2.2MB): 2.2MB downloaded
Storing download in cache at ./Library/Caches/pip-downloads/http%3A%2F%2Fpypi.python.org%2Fpackages%2Fsource%2Fv%2Fvirtualenv%2Fvirtualenv-1.8.2.tar.gz
Running setup.py egg_info for package virtualenv
warning: no previously-included files matching '*' found under directory 'docs/_templates'
warning: no previously-included files matching '*' found under directory 'docs/_build'
Requirement already satisfied (use --upgrade to upgrade): virtualenv-clone in /Library/Python/2.7/site-packages (from virtualenvwrapper)
Requirement already satisfied (use --upgrade to upgrade): stevedore in /Library/Python/2.7/site-packages (from virtualenvwrapper)
Requirement already satisfied (use --upgrade to upgrade): distribute in /usr/local/lib/python2.7/site-packages/distribute-0.6.28-py2.7.egg (from stevedore->virtualenvwrapper)
Installing collected packages: virtualenvwrapper, virtualenv
Running setup.py install for virtualenvwrapper
Skipping installation of /usr/local/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/virtualenvwrapper/__init__.py (namespace package)
Installing /usr/local/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/virtualenvwrapper-3.6-py2.7-nspkg.pth
changing mode of /usr/local/share/python/virtualenvwrapper.sh to 755
changing mode of /usr/local/share/python/virtualenvwrapper_lazy.sh to 755
Running setup.py install for virtualenv
warning: no previously-included files matching '*' found under directory 'docs/_templates'
warning: no previously-included files matching '*' found under directory 'docs/_build'
Installing virtualenv script to /usr/local/share/python
Installing virtualenv-2.7 script to /usr/local/share/python
Successfully installed virtualenvwrapper virtualenv
Cleaning up...