nilp0inter

class Gray:
    def __init__(self, length):
        self.length = length

    def _gen(self, start, end, n):
        if n == 1:
            yield (start, )
            yield (end, )
        else:
            for s in Gray(n-1):

nilp0inter

class Gray:
    def __init__(self, length):
        self.length = length

    def _right(self, n):
        if n == 1:
            yield (0,)
            yield (1,)
        else:
            for s in Gray(n-1):

nilp0inter

import sys

BAD_VERSIONS = [
    (2, 4),
    (2, 5),
    (2, 6) ]


TRANSLATE_TEXT = sys.version_info[:2] in BAD_VERSIONS