Demo/scripts/primes.py

   1 #! /usr/bin/env python
   2
   3 # Print prime numbers in a given range
   4
   5 def primes(min, max):
   6     if max >= 2 >= min:
   7         print 2
   8     primes = [2]
   9     i = 3
  10     while i <= max:
  11         for p in primes:
  12             if i % p == 0 or p*p > i:
  13                 break
  14         if i % p != 0:
  15             primes.append(i)
  16             if i >= min:
  17                 print i
  18         i += 2
  19
  20 def main():
  21     import sys
  22     min, max = 2, 0x7fffffff
  23     if sys.argv[1:]:
  24         min = int(sys.argv[1])
  25         if sys.argv[2:]:
  26             max = int(sys.argv[2])
  27     primes(min, max)
  28
  29 if __name__ == "__main__":
  30     main()