Zip function in python 3.2.3 not working as hoped

Question

I am trying to define a function that transposes a matrix. This is my code:

def Transpose (A):
    B = list(zip(*A))
    return B

Now when I call the function somewhere in the program like such:

Matrix = [[1,2,3],[4,5,6],[7,8,9]]
Transpose(Matrix)
print(Matrix)

The matrix comes out unchanged. What am I doing wrong?

jamylak · Accepted Answer · 2012-05-05 13:25:20Z

7

Your function returns a new value that does not affect your matrix (zip does not change it's parameters). You are not doing anything wrong, that is the correct way of doing things. Just change it to:

print(Transpose(Matrix))

or

Matrix = Transpose(Matrix)

Note: You really should be using lower-case names for your functions and variables.

edited May 5, 2012 at 13:25

answered May 5, 2012 at 13:18

jamylak

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