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I am trying to use nested list comprehension to transpose a matrix in python

I am confused as to why this won't return a transposed matrix. I am trying to implement a matrix transpose in python, specifically using nested list comprehension. 

return [[row[i] for i in range(len(m))] for row in m]

m is my matrix above. 

m = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]

I get back the same matrix I passed in for the return statement above. What am I doing wrong?

random_coder_101
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1 Answers1

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It is not clear why do you expect that your code can trapspose matrix. So I can't explain what is wrong here. You just copy the matrix instead of transposing. Try this:

m = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
print [[row[i] for row in m] for i in range(len(m[0]))]
Ilya
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