如何使用 gitpython 对当前提交与上次提交进行 git diff？

我正在尝试掌握 gitpython 模块，

hcommit = repo.head.commit
tdiff = hcommit.diff('HEAD~1')

but tdiff = hcommit.diff('HEAD^ HEAD')不起作用！也不('HEAD~ HEAD').,

我正在尝试获取差异输出！

import git

repo = git.Repo('repo_path')
commits_list = list(repo.iter_commits())

# --- To compare the current HEAD against the bare init commit
a_commit = commits_list[0]
b_commit = commits_list[-1]

a_commit.diff(b_commit)

这将为提交返回一个 diff 对象。还有其他方法可以实现这一目标。例如（这是从复制/粘贴http://gitpython.readthedocs.io/en/stable/tutorial.html#obtaining-diff-information):

```

    hcommit = repo.head.commit
    hcommit.diff()                  # diff tree against index
    hcommit.diff('HEAD~1')          # diff tree against previous tree
    hcommit.diff(None)              # diff tree against working tree

    index = repo.index
    index.diff()                    # diff index against itself yielding empty diff
    index.diff(None)                # diff index against working copy
    index.diff('HEAD')              # diff index against current HEAD tree

```