Python 怎样出矩阵啊，就单位阵
# coding: utf-8

# If you use python 2, uncomment the following line.
from __future__ import print_function

import numpy as np
import matplotlib.pyplot as plt


def warm_up_exercise():
    """热身练习"""
    A = None
    # ====================== 你的代码 ==========================
    # 在下面加入你的代码，使程序返回一个 5x5 的单位矩阵

    # =========================================================
    return A
就像这个，5*5的单位阵