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�StringTranslatePseudoMappingaT  Utility class to be used with str.translate()
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    Otherwise, the default value given upon initialization is returned.
    This allows using str.translate() to make some replacements, and to
    replace all characters for which no replacement was specified with
    a given character instead of leaving them as-is.
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    >>> preserve_dict = {ord(c): ord(c) for c in whitespace_chars}
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    >>> text = "a + b\tc\nd"
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