Python 3 preparation: update string translate method call in cgi/accept_language.py. The str translate method in Python 3 is sufficiently different from that in Python 2 that different arguments are needed here. Note that the existing code "ascii = ''.join([chr(x) for x in range(256)])" is redundant with both versions (in Python 2, None can be used instead as the first translate argument from Python 2.6 onwards).

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