python读取txt文件并画图

https://blog.csdn.net/Astro_Dog/article/details/80700243

import matplotlib.pyplot as plt
filename = 'test1.txt'
X,Y = [],[]
with open(filename, 'r') as f:#1
    lines = f.readlines()#2
    for line in lines:#3
        value = [float(s) for s in line.split()]#4
        X.append(value[0])#5
        Y.append(value[1])
 
print(X)
print(Y)
 
plt.plot(X, Y)
plt.show()

　　

 https://stackoverflow.com/questions/24725376/read-and-plot-multiple-txt-files-in-python

import numpy as np
import matplotlib.pyplot as plt

for fname in ('frequency1.txt', 'frequency2.txt' ...):
    data=np.loadtxt(fname)
    X=data[:,1]
    Y=data[:,2]
    plt.plot(X,Y,':ro')
plt.ylim((0,55000))
plt.show() #or
plt.save('figure.png')