七. 从文件中加载数据

import matplotlib.pyplot as plt
import csv
import numpy as np

# csv 方法
x = []
y = []

with open(‘example.txt‘,‘r‘) as csvfile:
    plots = csv.reader(csvfile, delimiter=‘,‘)
    for row in plots:
        x.append(int(row[0]))
        y.append(int(row[1]))

#numpy 方法
x1, y1 = np.loadtxt(‘example1.txt‘, delimiter=‘,‘, unpack=True)

plt.plot(x,y, label=‘csv method‘)
plt.plot(x1,y1, label=‘numpy method‘)
plt.xlabel(‘x‘)
plt.ylabel(‘y‘)
plt.title(‘Graph\n‘)
plt.legend()
plt.show()