例2.37生成服从标准正态分布的24 4 随机数矩阵呢个，并保存为DataFrame 数据结构
import pandas as pd
import numpy as np
datas = pd.date_range(start='20191101',end='20191124',freq = 'D')
a1 = pd.DataFrame(np.random.randn(24,4),index = datas , columns = list('ABCD'))
a2 = pd.DataFrame(np.random.rand(24,4))
print(a1)
print(a2)
print("学号:3008")结果如下
