How to return matrix rows and columns in python

This time I will bring you pythonHow to return the matrix rows and columns, and what are the precautions for python to return the matrix rows and columns. The following is a practical case, let's take a look.

The example is as follows:

# TODO 返回矩阵的行数和列数
def shape(M):
  return len(M),len(M[0])

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