from typing import List
"""
Transpose a given matrix.
Args:
    M (List[List]): A 2D list representing the matrix to be transposed.
Returns:
    List[List]: The transposed matrix.
Example:
    >>> matrix = [
    ...     [1, 2, 3],
    ...     [4, 5, 6]
    ... ]
    >>> matrix_transpose(matrix)
    [[1, 4], [2, 5], [3, 6]]
    
NOTE: If you import the matrix_transpose module into your project, call it with matrix_transpose.transpose(M).

"""

def transpose(M) -> List[List]:
    row = []
    T = []
    mcols = len(M[0])
    nrows = len(M)          
    for i in range(0, mcols):       
        for j in range(0, nrows):
            row.append(M[j][i])
        T.append(row)
        row = []
    return T