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generate_tokens(readline) is a generator that breaks a stream of
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5-tuples with these members:

    the token type (see token.py)
    the token (a string)
    the starting (row, column) indices of the token (a 2-tuple of ints)
    the ending (row, column) indices of the token (a 2-tuple of ints)
    the original line (string)

It is designed to match the working of the Python tokenizer exactly, except
that it produces COMMENT tokens for comments and gives type OP for all
operators

Older entry points
    tokenize_loop(readline, tokeneater)
    tokenize(readline, tokeneater=printtoken)
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    Each call to the function should return one line of input as a string.

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    It will call readline a maximum of twice, and return the encoding used
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    It detects the encoding from the presence of a utf-8 bom or an encoding
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    Round-trip invariant for limited intput:
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        t1 = [tok[:2] for tok in generate_tokens(f.readline)]
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