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length of a matrix in python

matrix = [[1, 2]]
rows = len(matrix) # Height.
columns = len(matrix[0]) # Width.
print(rows)
print(columns)
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size of matrix python

>>> a=[[1,5,6,8],[1,2,5,9],[7,5,6,2]]
>>> len(a)
3
>>> len(a[0])
4
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