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Exploring a question about primes
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| #!/usr/bin/env python | |
| from math import sqrt | |
| from sys import argv | |
| def is_prime(num): | |
| if num is 2: | |
| return True | |
| # print range(2, int(sqrt(num)) + 1) | |
| for i in range(2, int(sqrt(num)) + 1): | |
| if num % i == 0: | |
| return False | |
| return True | |
| def are_primes(filename): | |
| primes = [] | |
| composites = [] | |
| for i in open(filename): | |
| num = int(i) | |
| if not is_prime(num): | |
| composites.append(num) | |
| else: | |
| primes.append(num) | |
| print '%s contains these primes: %s' % (filename, primes) | |
| print '%s contains these composites: %s' % (filename, composites) | |
| if __name__ == '__main__': | |
| print argv[1] | |
| if argv[1] == '-f': | |
| are_primes(argv[2]) | |
| else: | |
| num_list = [int(i) for i in argv[1:]] | |
| for num in num_list: | |
| print 'number: %s. prime number: %s' % (num, is_prime(num)) |
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