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

[Christopher Welborn]

Christopher Welborn added the comment:

I should clarify that last sentence, I was trying to say that the type is determined by the first item. If the user tries to mix bytes/text they will receive the proper error from io's writelines when the mismatched type is written. If the first item is neither str nor bytes, then raise a ValueError.

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