def post_gist(func_name, git_token, gist_description=None, public=True):
    """Post input function source code to your Github gist."""
    from inspect import getsource
    from github import Github, InputFileContent
    
    if not gist_description:
        gist_description = func_name.__doc__
    
    me = Github(git_token).get_user()
    code = {func_name.__name__ + '.py': InputFileContent(getsource(func_name))}
    me.create_gist(public, code, gist_description)