python批量出圖

import numpy as np 
import matplotlib.pyplot as plt 

fname = "data.dat"
data = np.zeros([4100,2])  # 數據量
data = np.loadtxt( fname )

t  = data[:,0]
et = data[:,1]


for i in range(1, 42):   # 41個數據點,每個點100個時間道數據
        plt.figure()
        plt.loglog( t[(i-1)*100:i*100], et[(i-1)*100:i*100] )
        
plt.show()