Buggy python submission (verdict: Runtime Error):
import fractions
 
n = int(input())
a = [int(value) for value in input().split(" ")]
 
from_right_gcd = []
from_left_gcd = []
 
# 左から
for index in range(a.__len__):
    if index == 0:
        from_left_gcd.append(a[index])
        continue
    from_left_gcd.append(fractions.gcd(from_left_gcd[index - 1], a[index]))
 
# 右から
for index in range(a.__len__ - 1, -1, -1):
    if index == a.__len__ - 1:
        from_right_gcd.append(a[index])
        continue
    from_right_gcd.append(fractions.gcd(from_right_gcd[a.__len__ - index - 1 - 1], a[index]))
 
maybe_answer_list = []
 
for index in range(a.__len__):
    if index == 0:
        maybe_answer_list.append(from_right_gcd[a.__len__ - 1 - 1])
        continue
    if index == a.__len__ - 1:
        maybe_answer_list.append(from_left_gcd[index - 1])
        continue
    maybe_answer_list.append(fractions.gcd(from_left_gcd[index - 1], from_right_gcd[a.__len__ - index - 1 - 1]))
 
print(max(maybe_answer_list))

Fixed submission:
import fractions
# import math
from functools import reduce
 
def gcd_list(numbers):
    return reduce(fractions.gcd, numbers)
 
n = int(input())
a = [int(value) for value in input().split(" ")]

from_right_gcd = []
from_left_gcd = []

# 左から
for index in range(len(a)):
    if index == 0:
        from_left_gcd.append(a[index])
        continue
    from_left_gcd.append(fractions.gcd(from_left_gcd[index - 1], a[index]))

# 右から
for index in range(len(a) - 1, -1, -1):
    if index == len(a) - 1:
        from_right_gcd.append(a[index])
        continue
    from_right_gcd.append(fractions.gcd(from_right_gcd[len(a) - index - 1 - 1], a[index]))

maybe_answer_list = []

for index in range(len(a)):
    if index == 0:
        maybe_answer_list.append(from_right_gcd[len(a) - 1 - 1])
        continue
    if index == len(a) - 1:
        maybe_answer_list.append(from_left_gcd[index - 1])
        continue
    maybe_answer_list.append(fractions.gcd(from_left_gcd[index - 1], from_right_gcd[len(a) - index - 1 - 1]))

print(max(maybe_answer_list))

Buggy python submission (verdict: Runtime Error):
# import fractions
import math
from functools import reduce

def gcd_list(numbers):
    return reduce(math.gcd, numbers)

n = int(input())
a = [int(value) for value in input().split(" ")]


a = sorted(a)

b = []
c = []

for value in a:
    if value % 2 != 0:
        b.append(value)
    else:
        c.append(value)

if len(b) == 0:
    a.remove(c[0])
    print(gcd_list(a))
else:
    a.remove(b[0])
    print(gcd_list(a))

Fixed submission:
import fractions
# import math
from functools import reduce
 
def gcd_list(numbers):
    return reduce(fractions.gcd, numbers)
 
n = int(input())
a = [int(value) for value in input().split(" ")]

from_right_gcd = []
from_left_gcd = []

# 左から
for index in range(len(a)):
    if index == 0:
        from_left_gcd.append(a[index])
        continue
    from_left_gcd.append(fractions.gcd(from_left_gcd[index - 1], a[index]))

# 右から
for index in range(len(a) - 1, -1, -1):
    if index == len(a) - 1:
        from_right_gcd.append(a[index])
        continue
    from_right_gcd.append(fractions.gcd(from_right_gcd[len(a) - index - 1 - 1], a[index]))

maybe_answer_list = []

for index in range(len(a)):
    if index == 0:
        maybe_answer_list.append(from_right_gcd[len(a) - 1 - 1])
        continue
    if index == len(a) - 1:
        maybe_answer_list.append(from_left_gcd[index - 1])
        continue
    maybe_answer_list.append(fractions.gcd(from_left_gcd[index - 1], from_right_gcd[len(a) - index - 1 - 1]))

print(max(maybe_answer_list))

Buggy python submission (verdict: Runtime Error):
import fraction
# import math
from functools import reduce

def gcd_list(numbers):
    return reduce(fraction.gcd, numbers)

n = int(input())
a = [int(value) for value in input().split(" ")]


a = sorted(a)

b = []
c = []

for value in a:
    if value % 2 != 0:
        b.append(value)
    else:
        c.append(value)

if len(b) == 0:
    a.remove(c[0])
    print(gcd_list(a))
else:
    a.remove(b[0])
    print(gcd_list(a))

Fixed submission:
import fractions
# import math
from functools import reduce
 
def gcd_list(numbers):
    return reduce(fractions.gcd, numbers)
 
n = int(input())
a = [int(value) for value in input().split(" ")]

from_right_gcd = []
from_left_gcd = []

# 左から
for index in range(len(a)):
    if index == 0:
        from_left_gcd.append(a[index])
        continue
    from_left_gcd.append(fractions.gcd(from_left_gcd[index - 1], a[index]))

# 右から
for index in range(len(a) - 1, -1, -1):
    if index == len(a) - 1:
        from_right_gcd.append(a[index])
        continue
    from_right_gcd.append(fractions.gcd(from_right_gcd[len(a) - index - 1 - 1], a[index]))

maybe_answer_list = []

for index in range(len(a)):
    if index == 0:
        maybe_answer_list.append(from_right_gcd[len(a) - 1 - 1])
        continue
    if index == len(a) - 1:
        maybe_answer_list.append(from_left_gcd[index - 1])
        continue
    maybe_answer_list.append(fractions.gcd(from_left_gcd[index - 1], from_right_gcd[len(a) - index - 1 - 1]))

print(max(maybe_answer_list))