如何修改Python Tkinter代码避免弹出两个窗口？

问题根源在于代码中使用了plt.figure()，该方法会触发Matplotlib默认后端创建独立的Figure窗口。要仅保留Tkinter应用窗口，需直接使用matplotlib.figure.Figure类创建绘图对象，而非依赖pyplot接口。

修改后的完整代码 #

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

class Application(tk.Frame):
    def __init__(self, master):
        tk.Frame.__init__(self, master)
        self.createWidgets()
   
    def createWidgets(self):
        # 直接实例化Figure类，不会生成独立窗口
        fig = Figure(figsize=(8,8))
        ax = fig.add_axes([0.1,0.1,0.8,0.8], polar=True)
        canvas = FigureCanvasTkAgg(fig, master=root)
        canvas.get_tk_widget().grid(row=0,column=1)
        self.plotbutton = tk.Button(master=root, text="plot", command=lambda: self.plot(canvas, ax))
        self.plotbutton.grid(row=0, column=0)

    def plot(self, canvas, ax):
        c= ['r','b','g']
        ax.clear()
        for i in range(3):
            theta = np.random.uniform(0,360,10)
            r = np.random.uniform(0,1,10)
            ax.plot(theta,r,linestyle="None",marker='o',color=c[i])
        canvas.draw()  # 移到循环外减少重复绘制开销

root=tk.Tk()
app=Application(master=root)
app.mainloop()

核心修改说明 #

• 删除import matplotlib.pyplot as plt，替换为直接导入from matplotlib.figure import Figure
• 将plt.figure()替换为Figure()实例化，避免触发pyplot的默认窗口创建逻辑
• 优化绘图逻辑：把canvas.draw()移到循环外部，提升绘制效率

内容的提问来源于stack exchange，提问作者Ted Ersek