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Check primes
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| #!/usr/bin/env python | |
| # | |
| # check_prime.py | |
| # Check if a number (given by the first argument) is prime. | |
| # | |
| import sys | |
| import math | |
| # Die if there is no first argument. | |
| if len(sys.argv) < 2: | |
| print('USAGE: {} N'.format(sys.argv[0])) | |
| sys.exit(1) | |
| N = int(sys.argv[1]) | |
| for i in range(2, int(math.sqrt(N))): | |
| if N % i == 0: break | |
| else: | |
| print(N) |
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