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Update transposition snippet (python) #634

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zipping the matrix is a nice trick but it doesn't always produce what you need (a matrix) in a time-sensitive interview environment. The output of zip is an iterator of tuples which doesn't allow accessing elements by index. Converting the iterator of tuples to matrix takes the same amount of code as transposing the matrix itself

transposed_matrix[0][0] will raise an error
TypeError: 'zip' object is not subscriptable

zip is a nice trick but it doesn't output a matrix. The output of zip is an iterator of tuples. You can't use it for accessing elements of matrix by index.

`transposed_matrix[0][0]` will raise an error
`TypeError: 'zip' object is not subscriptable`
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