如何删除shutil.rmtree中未使用的函数参数 [英] How to remove unused function parameters in shutil.rmtree

问题描述

在这个问题中，回答如何删除只读文件被呈现.它非常有效，但需要使用未使用的参数.在另一个问题中，有人问如何告诉pylint在不添加特定注释的情况下(例如，通过使用 _)，未使用多个不相邻的参数.许多答案都大致是ZOMG 你设计错了"，所以我保证我会举一个例子，在需要的地方，这是我无法控制的.这是那个例子.

In this question, an answer to how to remove read-only files is presented. It's super effective but requires having unused parameters. In this other question it was asked how to tell pylint that multiple non-adjacent parameters are unused without adding a specific comment (e.g., by using _). Many of the answers were approximately "ZOMG YOU'RE DESIGNING IT WRONG" so I promised I would put up an example where this is needed and out of my control. Here is that example.

shutil.rmtree(self._temp_dir, onerror=del_rw)

def del_rw(action, name, exc):
    os.chmod(name, stat.S_IWRITE)
    os.remove(name)

使 pylint 不会抱怨 action 和 exc 的答案"是

The "answer" so that pylint would not complain about action and exc is to

shutil.rmtree(self._temp_dir, onerror=del_rw)

def del_rw(_action, name, _exc):
    os.chmod(name, stat.S_IWRITE)
    os.remove(name)

但新的问题是，如何在没有 _action 或 _exc 作为参数的情况下做到这一点?

but the new question is, how to do this without having _action or _exc as parameters?

推荐答案

正如评论中所讨论的，你不能忽略 action 和 exc 因为 rmtree 将这些参数传递给回调.来自 python 文档:

As discussed in the comments, you cannot just ignore action, and exc because rmtree will pass those arguments to the callback. From the python docs:

如果提供了onerror，它必须是一个可调用的，接受三个参数:function、path 和 excinfo.

If onerror is provided, it must be a callable that accepts three parameters: function, path, and excinfo.

话虽如此，您有几个选择:

That being said, you have a couple of options:

• 您可以使用 cb_ 为回调添加前缀(请参阅 pylint 文档 在这方面)，把你的功能变成:

• You can prefix the callback with a cb_ (see pylint docs on this as well), turning your function into:

shutil.rmtree(self._temp_dir, onerror=cb_del_rw)

def cb_del_rw(action, name, exc):
    os.chmod(name, stat.S_IWRITE)
    os.remove(name)

您可以使用关键字参数(您也可以使用 *args，但我发现这种方法更具可读性):

You can use keyword arguments (you could also use *args, but I find this approach more readable):

shutil.rmtree(self._temp_dir, onerror=del_rw)

def del_rw(**kwargs):
    name = kwargs['name']
    os.chmod(name, stat.S_IWRITE)
    os.remove(name)

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