StepRange.py

#!/usr/bin/python

import operator

def step_range(start, end, step, step_func, compare_func):
    while compare_func(start, end):
        yield start
        start = step_func(start, step)

def main():
    print [x for x in step_range(1, 64, 2, operator.mul, operator.le)]
    print [x for x in step_range(64, 0, 2, operator.div, operator.gt)]
    print [x for x in step_range(0, 64, 8, operator.add, operator.le)]
    print [x for x in step_range(64, 0, 8, operator.sub, operator.ge)]

if __name__ == '__main__':
    main()

#####################################################################
# Output                                                            #
# ----------------------------------                                #
# [1, 2, 4, 8, 16, 32, 64]                                          #
# [64, 32, 16, 8, 4, 2, 1]                                          #
# [0, 8, 16, 24, 32, 40, 48, 56, 64]                                #
# [64, 56, 48, 40, 32, 24, 16, 8, 0]                                #
#####################################################################