Traceback (самый последний звонок последний) ошибка в Python ⇐ Python

[Anonymous]

def adder(l1,l2,op):

if(op == 0):

carry = 0
result = []
l1.reverse()
l2.reverse()

for x in range(0, 4):

sum = l1[x] + l2[x] + carry

if(sum == 0):
result[x] = 0
carry = 0
elif(sum == 1):
result[x] = 1
carry = 0
elif(sum == 2):
result[x] = 0
carry = 1
elif(sum == 3):
result[x] = 1
carry = 1

if(x == 2):
carry_in = carry
if(x == 3):
carry_out = carry

result.reverse()

overflow = carry_in ^ carry_out
sign = result[3]
zero = not(result[0] | result[1] | result[2] | result[3])
sign_of_true_result = overflow ^ sign

print result,carry,overflow,sign,zero,sign_of_true_result

number1 = []
number2 = []
print "Enter the bits of number 1 one by one: "

x = 0
while(x < 4):

digit_1 = raw_input()

if(digit_1 != '0' and digit_1 != '1'):
print "Please enter either 0 or 1"
continue
else:
x = x + 1
number1.append(int(digit_1))

print "Enter the bits of number 2 one by one: "

y = 0
while(y < 4):

digit_2 = raw_input()

if(digit_2 != '0' and digit_2 != '1'):
print "Please enter either 0 or 1"
continue
else:
y = y + 1
number2.append(int(digit_2))

op = int(raw_input("Press 0 for addition or 1 for substraction (Op): "))

if __name__ == '__main__':
adder(number1,number2,op)
< /code>

Я пытаюсь реализовать бинарное oDDER на 4 бита. Я получаю следующую ошибку. В чем проблема с строкой 22? Я не понимаю, почему есть ошибка вне диапазона. < /P>

Ошибка: < /p>

Traceback (most recent call last):
File "ex9.py", line 85, in
adder(number1,number2,op)
File "ex9.py", line 22, in adder
result[x] = 0
IndexError: list assignment index out of range


Подробнее здесь: https://stackoverflow.com/questions/260 ... -in-python