python matplotlib从文件中读取数据绘制散点图

示例说明：从一个文件读取数据，绘制成散点图

#coding:utf-8
import matplotlib.pyplot as plt
import numpy as np
import matplotlib as mpl
mpl.rcParams['font.family'] = 'sans-serif'
mpl.rcParams['font.sans-serif'] = 'NSimSun,Times New Roman'

x, y = np.loadtxt('data.txt', delimiter=',', unpack=True)
plt.plot(x,y, '+',label='PoW算法',color='black')

plt.xlabel('难度值')
plt.ylabel('时间')
plt.title('PoW共识的hash难题解决时间表')
plt.legend()
plt.show()#coding:utf-8
import