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� StringTranslatePseudoMappingaT Utility class to be used with str.translate()
This Mapping class wraps a given dict. When a value for a key is
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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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>>> whitespace_chars = ' \t\n\r'
>>> preserve_dict = {ord(c): ord(c) for c in whitespace_chars}
>>> mapping = StringTranslatePseudoMapping(preserve_dict, ord('x'))
>>> text = "a + b\tc\nd"
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