How to use 'ascii to char python' in Python

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def is_ascii(char):
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    try:
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        return ord(char) < 128
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    except:
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        return False

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def ToChar(byte):
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    """Convert a byte to a character
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    This is useful because in Python 2 bytes is an alias for str, but in
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    Python 3 they are separate types. This function converts an ASCII value to
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    a value with the appropriate type in either case.
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    Args:
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        byte: A byte or str value
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    """
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    return chr(byte) if type(byte) != str else byte