Traversing through Matrix in Python

Question

I'm new to Python and I'm trying to create a simple tictactoe game to learn the syntax and keep getting an error TypeError: object of type 'int' has no len() when running the following:

board = [ 
            ['|', '|', '|' ],
            ['|', '|', '|'],
            ['|', '|', '|'] 
        ] 

def tictactoe ():

    print('\n'.join([''.join(['{:4}'.format(item) for item in row]) for row in board]))

    print(len(board))

    for i in range(0,len(board)):
        for j in range(0,len(i)):
            print(i,j)

c1phr · Accepted Answer · 2015-04-18 17:02:03Z

2

The error is coming from the second line of your for loop:

for j in range(0, len(i))

This won't work since you're trying to get the length of i which is an integer value here. Instead, you can just go through the range of i as:

for j in range(0, i)

answered Apr 18, 2015 at 17:02

c1phr

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Comments

unutbu · Accepted Answer · 2015-04-18 17:00:24Z

0

int has no len() implies you are calling len on an int. Scanning your code shows len(i) is the only place len is called. And indeed, if you use for i in range(...) then i will be an int.

Perhaps you meant to use

for i in range(0,len(board)):
    for j in range(0, i):
        print(i,j)

instead.

answered Apr 18, 2015 at 17:00

unutbu

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Comments

manicphase · Accepted Answer · 2015-04-18 17:01:14Z

0

for i in range(0,len(board)):
    for j in range(0,len(i)):
        print(i,j)

You declared i as an int in the first line here. just use

for j in range(0, i)

answered Apr 18, 2015 at 17:01

manicphase

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