python - 使用 pip 从存储库安装软件包时，(s)witch、(i)gnore、(w)ipe、(b)ackup 选项是什么意思？

Question

使用 pip 安装软件包时，我收到以下消息:

Obtaining some-package from git+git://github.com/some-user/some-package.git@commit-hash#egg=some_package-dev (from -r requirements.txt
 (line 3))
  git clone in /Users/me/Development/some-env/src/some-package exists with
 URL https://github.com/some-user/some-package.git
  The plan is to install the git repository git://github.com/some-user/some-package.git
What to do?  (s)witch, (i)gnore, (w)ipe, (b)ackup

我看到这种特殊情况可能是由于 URL 中的协议(protocol)更改引起的(新要求使用 git://，而已经安装的要求使用 https://)。

但是，我想知道如果我选择其中一个选项(切换、忽略、删除、备份)会发生什么。我在 pip 文档中找不到解释。

Answer 1

解释此选项的补丁已 merge 到 PIP 文档中，但直到 Pip 6.0 (2014-12-22) 才发布。 (https://github.com/pypa/pip/commit/b5e54fc61c06268c131f1fad3bb4471e8c37bb25)。补丁是这样写的:

--exists-action option

This option specifies default behavior when path already exists.Possible cases: downloading files or checking out repositories for installation,creating archives. If --exists-action is not defined, pip will promptwhen decision is needed.

• (s)witch

  Only relevant to VCS checkout. Attempt to switch the checkoutto the appropriate url and/or revision.

• (i)gnore

  Abort current operation (e.g. don't copy file, don't create archive,don't modify a checkout).

• (w)ipe

  Delete the file or VCS checkout before trying to create, download, or checkout a new one.

• (b)ackup

  Rename the file or checkout to {name}{'.bak' * n}, where n is some numberof .bak extensions, such that the file didn't exist at some point.So the most recent backup will be the one with the largest number after .bak.

这里是现在更新的文档中该选项描述的链接:https://pip.pypa.io/en/stable/cli/pip/#exists-action-option .