Find 1000th prime number

Thousanth_prime.py

# -*- coding: utf-8 -*-
"""
Created on Tue Aug 12 23:54:45 2014

@author: Allen
"""

primes = [2]  # Vector of prime numbers: initialize with 2, since that is
              # a prime number but fails the tests

def ptest(num):
    if num in [2, 3, 5, 7]:
        return(True)
    
    if num % 2 == 0:
        return(False)

    rem = [num % i for i in range(3,num)]
    if 0 in rem:
        return(False)
    else:
        return(True)

counter = 1     # This will cause the ptest to start at 3
while len(primes) < 1000:
    counter += 2
    if ptest(counter):
        primes.append(counter)
            
print('The 1000th prime number is: ', primes[999])