[ Python 常見問題 ] How to checkout a tag with GitPython

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Question
In a python script, I try to checkout a tag after cloning a git repository. I use GitPython 0.3.2.

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1. #!/usr/bin/env python  
2. import git  
3. g = git.Git()  
4. g.clone("user@host:repos")  
5. g = git.Git(repos)  
6. g.execute(["git", "checkout", "tag_name"])  

With this code I have an error:

g.execute(["git", "checkout", "tag_name"])
File "/usr/lib/python2.6/site-packages/git/cmd.py", line 377, in execute
raise GitCommandError(command, status, stderr_value)
GitCommandError: 'git checkout tag_name' returned exit status 1: error: pathspec 'tag_name' did not match any file(s) known to git.

If I replace the tag name with a branch name, I have no problem. I didn't find informations in GitPython documentation. And if I try to checkout the same tag in a shell, I have non problem. Do you know how can I checkout a git tag in python ?

HowTo
Assuming you cloned the repository in 'path/to/repo', just try this:

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1. from git import Git  
2.   
3. g = Git('path/to/repo')  
4. g.checkout('tag_name')