IndexError: list index out of range 2 dimension list

Question

I get this error:

Traceback (most recent call last): File "C:/Python27/main.py", line 21, in matrix[1][1].append(2) IndexError: list index out of range

This is my code

file = open("C:\\Python27\\test.txt", "r")

s1 = file.read();
s2 = file.read();

matrix = [[0 for x in range(len(s1))] for x in range(len(s2))]

matrix[1][1].append(2)
print matrix[1][1]

len(s1) and len(s2) is larger than 5

I try using matrix[1][1] = 2 instead of matrix[1][1].append(2)but it won't work.

So what's my mistakes?

matrix[1][1].append(2) will certainly not work as you are trying to append to an int — j-i-l
– j-i-l, Commented Jul 29, 2015 at 14:11
Just a comment on style, I'd use matrix = [ [0] * len(s1) ] * len(s2) — CAB
– CAB, Commented Nov 2, 2016 at 17:01

nachodev · Accepted Answer · 2015-07-29 14:05:50Z

3

I'd print len(s1) and len(s2). They are probably not what you expect. And if you want to set row 1 col 1 of matrix you would do:

matrix[1][1] = 2

because otherwise you are trying to append number 2 to element at (1,1) which is not a list.

answered Jul 29, 2015 at 14:05

nachodev

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