numpy 读取文件数据

# author: Roy.G
import numpy as np
import matplotlib.pyplot as mp
data1,data2,data3,data4=np.loadtxt(
    'aa.csv',
    encoding='utf-8-sig', #当使用utf-8时，会出现\ufeff，用-sig解决问题
    delimiter=',',
    usecols= (0,1,2,3),
    dtype ='U18,f8,f8,f8',
    unpack =True     #拆包
                )
print(data2)
t=np.arange(0,len(data3))
mp.plot(data1,data3)
mp.show()