建立一个新矩阵，并按要求输出
import numpy as np
# 全0矩阵
a = np.zeros((3, 3))
print(a)
# 全1矩阵
b = np.ones((4, 5))
print(b)
# 单位矩阵
c = np.eye(4)
print(c)
# 随机矩阵
d = np.random.randint(0, 10, (3, 2))
print(d)
print(type(a[0, 0]))
print(type(b[0, 0]))
print(type(d[0, 0]))
import random
a = [[0 for n in range(3)] for n in range(3)]
print(a)
b = [[1 for n in range(5)] for n in range(4)]
print(b)
d = [[random.random() for n in range(2)] for n in range(3)]
print(d)
print(type(a[0][0]))
