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# String manipulation
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def to_unicode(str_):
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    if isinstance(str_, unicode): return str_
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    encodings = ['utf_8', 'latin_1']
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    for encoding in encodings:
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        try: return unicode(str_, encoding)
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        except UnicodeDecodeError, e: pass
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    raise AssertionError(encoding+' is not a catch-all encoding')
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