[issue20218] Add `pathlib.Path.write` and `pathlib.Path.read`

[Ram Rachum]

Ram Rachum added the comment:

I like the patch. Except I'd like to have support for the 'x' flag in the `write_text` and `write_bytes` methods. I suggest an argument `exclusive`, which defaults to `False`. When `exclusive=True`, the mode will be 'x' or 'xb'.

The first lines after each method definition should be:

    if append and exclusive:
        raise Exception("Can't use both `append` and `exclusive` modes together; `append` implies that the file exists, while `exclusive` implies it does not.")

If you don't like long exception texts, you can shorten it to just the first sentence. Also, you may want to choose a different exception class than `Exception`.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20218>
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