自制，python安装

Question

尝试通过自制程序安装python时出错。brew说明了链接python失败的原因，下面是输出：

Linking /usr/local/Cellar/python/2.7.3... Warning: Could not link python. Unlinking...
Error: Could not symlink file: /usr/local/Cellar/python/2.7.3/bin/smtpd2.py
/usr/local/bin/smtpd2.py may already exist.
/usr/local/bin may not be writable.

ls-la on/usr/bin和bin权限：

The drwxrwxrwx  26 root             admin  884 26 Oct 16:03 bin

并且smtpd2.py存在。。我怎样才能修好它？删除smtpd2.py？

Answer 1

你试过brew link --overwrite python吗？这对我很有用，而不必卸载python—请参见this question了解更多详细信息。

Answer 2

听起来像是/usr/local的权限问题。

### Makes you owner of /usr/local 
$ sudo chown -R `whoami` /usr/local

### Force uninstalls failed python
$ brew uninstall -f python

### Clear the brew cache
$ rm -rf `brew --cache`

### Recreate the brew cache
$ mkdir `brew --cache`

### Cleanup - cleans up old homebrew files
$ brew cleanup

### Prune - removes dead symlinks in homebrew
$ brew prune

### Doctor - runs homebrew checks for common error causing issues
$ brew doctor

########
### Google and follow steps to fix what `brew doctor` came back with
########

### Reinstall python
$ brew install python