我就廢話不多說了，還是直接看程式碼吧！

# -*- 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) #去掉上邊框
ax.spines['right'].set_visible(False) #去掉右邊框
ax.spines['bottom'].set_visible(False) #去掉上邊框
ax.spines['left'].set_visible(False) #去掉右邊框
ax.tick_params(axis='y',width=0,length=0)
ax.tick_params(axis='x',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,color='#9dbcd4',label='SVM',hatch='/')
rects3= plt.bar(index + bar_width/2,num_list2,color='#1f3d4b',label='CNN',hatch='-')
rects4= plt.bar(index + bar_width*3/4,num_list3,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 
# 設定legend
plt.legend(loc='center',bbox_to_anchor=(0.5,-0.2),ncol=4,frameon=False,shadow=False)
plt.tight_layout() 
plt.show() 

去除邊框，圖例放圖下面。設定橫標線

以上這篇python 畫圖 圖例自由定義方式就是小編分享給大家的全部內容了，希望能給大家一個參考，也希望大家多多支援我們。