Nth Prime

nth_prime.py

def nth_prime(n):
    """Finds the nth prime number.

    Arguments:
        n: The index of the saught after prime number.
    Returns:
        The value of the nth prime number.
    """
    prime_table, counter = [], 2
    prime_number, top, last = 0, 10000000, 0

    while (counter <= top):
        # build the list where one means nonprime, zero means prime
        prime_table.append(0)
        counter = counter + 1

    counter = 2

    while prime_number < n:
        # if that number has not been tagged as nonprime then...
        if (prime_table[counter - 2] == 0):
            multiplier = 2
            tmp = multiplier * counter
            while (tmp <= top):
                # mark the temporary value as nonprime
                prime_table[tmp - 2] = 1
                multiplier = multiplier + 1
                # change temp to next multiple value 
                tmp = multiplier * counter
            prime_number = prime_number + 1
            last = counter
        counter = counter + 1

    return last