[issue18814] Add tools for "cleaning" surrogate escaped strings

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

These functions are trivial.

    def has_escaped_bytes(s):
        try:
            s.encode()
            return False
        except UnicodeEncodeError:
            return True

    def replace_escaped_bytes(s):
        return s.encode('utf-8', 'replace').decode()

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nosy: +serhiy.storchaka

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<http://bugs.python.org/issue18814>
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