generate prime table with some tricks

generate_prime_table.py

#!  /usr/bin/python
 
from is_prime import is_prime
 
prime = [i * 0 for i in range(1000)]
 
prime[0] = 1
prime[1] = 2
prime[2] = 3
 
i = 5
step = 4
prime_size = 3
while i <= 1000:
    if is_prime(i) == True:
        prime[prime_size] = i
        prime_size += 1
    step ^= 6
    i += step
 
print(prime)