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March 20, 2017 08:15
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| def str_to_mask(mask): | |
| return reduce(lambda x, y: y+(x<<8), map(int, mask.split(".")), 0) | |
| def check_ip_mask(mask): | |
| while mask & 0x7fffffff: | |
| if not mask & 0x40000000: | |
| return False | |
| mask <<= 1 | |
| return True | |
| mask = '255.255.193.0' | |
| print bin(str_to_mask(mask)) | |
| print check_ip_mask(str_to_mask(mask)) |
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