Buggy python submission (verdict: Runtime Error):
import array
import bisect


def is_prime_number(num):
    limit = int(num ** 0.5)

    for lp in range(3, limit + 1, 2):
        if num % lp == 0:
            return False

    return True


LENGTH = 1000000
prime_number_list = array.array("i", [True] * (LENGTH + 1))

prime_number_list[0] = False
prime_number_list[1] = False

for lp in range(4, LENGTH + 1, 2):
    prime_number_list[lp] = False

limit = int((LENGTH + 1) ** 0.5)

for lp in range(3, limit + 1, 2):
    if is_prime_number(lp):
        for lp2 in range(lp * 2, LENGTH + 1, lp):
            prime_number_list[lp2] = False

prime_number_list = array.array("i", [index for index, item in enumerate(prime_number_list) if item])

while True:

    input_num = int(input())

    if input_num == 0:
        break

    count = 0

    array_size = bisect.bisect_left(prime_number_list, input_num // 2)

    for lp in prime_number_list[:array_size + 1]:

        search_num = input_num - lp

        index = bisect.bisect_left(prime_number_list, search_num)

        if prime_number_list[index] == search_num:
            count += 1

    print(count)



Fixed submission:
import array


def is_prime_number(num):
    limit = int(num ** 0.5)

    for lp in range(3, limit + 1, 2):
        if num % lp == 0:
            return False

    return True


LENGTH = 1000000
prime_number_list = array.array("i", [True] * (LENGTH + 1))

prime_number_list[0] = False
prime_number_list[1] = False

for lp in range(4, LENGTH + 1, 2):
    prime_number_list[lp] = False

limit = int((LENGTH + 1) ** 0.5)

for lp in range(3, limit + 1, 2):
    if is_prime_number(lp):
        for lp2 in range(lp * 2, LENGTH + 1, lp):
            prime_number_list[lp2] = False

while True:
    input_num = int(input())

    if input_num == 0:
        break

    count = 0

    for lp in range(2, input_num // 2 + 1):

        if prime_number_list[lp] and prime_number_list[input_num - lp]:
            count += 1

    print(count)

Buggy python submission (verdict: Runtime Error):
import array
import bisect


def is_prime_number(num):
    limit = int(num ** 0.5)

    for lp in range(3, limit + 1, 2):
        if num % lp == 0:
            return False

    return True


def binary_search(num_list, num):
    left = 0
    right = len(num_list)

    while left <= right:
        mid = (left + right) // 2

        if num_list[mid] == num:
            return True
        elif num_list[mid] < num:
            left = mid + 1
        else:
            right = mid - 1

    return False


LENGTH = 1000000
prime_number_list = array.array("i", [True] * (LENGTH + 1))

prime_number_list[0] = False
prime_number_list[1] = False

for lp in range(4, LENGTH + 1, 2):
    prime_number_list[lp] = False

limit = int((LENGTH + 1) ** 0.5)

for lp in range(3, limit + 1, 2):
    if is_prime_number(lp):
        for lp2 in range(lp * 2, LENGTH + 1, lp):
            prime_number_list[lp2] = False

prime_number_list = array.array("i", [index for index, item in enumerate(prime_number_list) if item])

while True:

    input_num = int(input())

    if input_num == 0:
        break

    count = 0

    array_size = bisect.bisect_left(prime_number_list, input_num // 2)

    for lp in prime_number_list[:array_size + 1]:

        search_num = input_num - lp

        if binary_search(prime_number_list, search_num):
            count += 1

    print(count)



Fixed submission:
import array


def is_prime_number(num):
    limit = int(num ** 0.5)

    for lp in range(3, limit + 1, 2):
        if num % lp == 0:
            return False

    return True


LENGTH = 1000000
prime_number_list = array.array("i", [True] * (LENGTH + 1))

prime_number_list[0] = False
prime_number_list[1] = False

for lp in range(4, LENGTH + 1, 2):
    prime_number_list[lp] = False

limit = int((LENGTH + 1) ** 0.5)

for lp in range(3, limit + 1, 2):
    if is_prime_number(lp):
        for lp2 in range(lp * 2, LENGTH + 1, lp):
            prime_number_list[lp2] = False

while True:
    input_num = int(input())

    if input_num == 0:
        break

    count = 0

    for lp in range(2, input_num // 2 + 1):

        if prime_number_list[lp] and prime_number_list[input_num - lp]:
            count += 1

    print(count)