python 画图 图例自由定义方式

 # -*- coding: utf-8 -*- """ Created on Wed Mar 7 13:10:21 2018 @author: su """ import numpy as np import matplotlib.pyplot as plt n_groups = 2 num_list = [0.8,0.80] num_list1 = [0.8,0.8] num_list2 = [0.9,0.9] num_list3 = [0.9,0.9] fig, ax = plt.subplots() plt.grid(True, linestyle = "-", color = "#9dbcd4", linewidth = "0.7",axis= 'y') ax = plt.gca() ax.spines['top'].set_visible(False) #去掉上边框 ax.spines['right'].set_visible(False) #去掉右边框 ax.spines['bottom'].set_visible(False) #去掉上边框 ax.spines['left'].set_visible(False) #去掉右边框 ax.tick_params(axis='y',width=0,length=0) ax.tick_params(axis='x',width=0,length=0) index = np.arange(n_groups) bar_width = 0.5 opacity = 1 rects1 = plt.bar(index, num_list, bar_width/4,alpha=opacity, color='#6B7C85',label='Logistic',hatch='') rects2 = plt.bar(index + bar_width/4, num_list1, bar_width/4,alpha=opacity,color='#9dbcd4',label='SVM',hatch='/') rects3= plt.bar(index + bar_width/2, num_list2, bar_width/4,alpha=opacity,color='#1f3d4b',label='CNN',hatch='-') rects4= plt.bar(index + bar_width*3/4, num_list3, bar_width/4,alpha=opacity,color='#3f829d',label='LSTM',hatch=':') # plt.xlabel('Group') plt.ylabel('Accuracy', fontsize=18) # plt.title('Scores by group and gender') plt.xticks(index - 0.3+ bar_width, ('Chinese', 'English'),fontsize =18) plt.yticks(fontsize =18) #change the num axis size plt.ylim(0.7,0.95) #The ceil # 设置legend plt.legend(loc='center', bbox_to_anchor=(0.5,-0.2),ncol=4,frameon=False,shadow=False) plt.tight_layout() plt.show()