通过删除Python中的旧条形图，将现有条形图替换为新条形图

Question

我对Python还不熟悉。当我单击名为更改数据的按钮时，我希望plt.close('all')删除旧图形。相反，新图形被放置在旧图形的旁边（在其左侧）。额外的点击会显示更多的图形，但旧的图形永远不会被删除。你知道吗

是我做错了还是这是一起使用tkinter和matplotlib的限制？你知道吗

import tkinter as tk
from tkinter import Button
import numpy as np
import matplotlib
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg
from matplotlib.figure import Figure
import matplotlib.pyplot as plt

matplotlib.use('TkAgg')

def displ_graf(datalst):
    ff = plt.figure(figsize=(5.6,4), dpi=100)
    xx = ff.add_subplot(1,1,1)
    nn = np.arange(len(datalst))
    bb = xx.barh(nn, datalst, 0.8)
    ff.tight_layout
    cc = FigureCanvasTkAgg(ff, master=ww)
    cc.draw()
    cc.get_tk_widget().pack(side=tk.RIGHT)

def graf2():
    plt.close('all')
    data2 = [64, 58, 12, 91, 49, 32, 70, 23, 35]
    displ_graf(data2)

ww = tk.Tk()
ww.geometry('700x400')
ww.state('zoomed')
butt3 = Button(ww,text=' CHANGE DATA ',command=graf2, height=1,width=15)
butt3.place(x=790, y=100)

data1 = [31, 41, 59, 26, 53, 58, 97, 93, 23]
displ_graf(data1)
ww.mainloop()

左侧图像显示单击按钮前的初始屏幕，右侧图像显示单击按钮后的屏幕：

Answer 1

您可以使用cc.get_tk_widget().destroy()来实现这一点。但你的代码似乎写得有点笨拙。所以不妨看看这个example

举个例子：

import tkinter as tk
from tkinter import Button
import numpy as np
import matplotlib
matplotlib.use('TkAgg')

from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg
from matplotlib.figure import Figure
import matplotlib.pyplot as plt



def displ_graf(datalst):
    ff = plt.figure(figsize=(5.6,4), dpi=100)
    xx = ff.add_subplot(1,1,1)
    nn = np.arange(len(datalst))
    bb = xx.barh(nn, datalst, 0.8)
    ff.tight_layout
    cc = FigureCanvasTkAgg(ff, master=ww)
    cc.draw()
    cc.get_tk_widget().pack(side=tk.RIGHT)
    return cc

def graf2():    
    data2 = [64, 58, 12, 91, 49, 32, 70, 23, 35]
    displ_graf(data2)

def destroy():
    canv.get_tk_widget().destroy()

ww = tk.Tk()
ww.geometry('700x400')
ww.state('normal')
butt3 = Button(ww,text=' CHANGE DATA ',command=graf2, height=1,width=15)
butt4 = Button(ww,text=' destroy ',command=destroy, height=1,width=15)
butt3.place(x=790, y=100)
butt4.place(x=500, y=100)

data1 = [31, 41, 59, 26, 53, 58, 97, 93, 23]
canv = displ_graf(data1)
ww.mainloop()

但这里的问题是每次运行displ_graph时都会创建一个新的cc实例