提问人：Arolan 提问时间：6/9/2023 最后编辑：Trenton McKinneyArolan 更新时间：6/9/2023 访问量：73
Tkinter 应用类从不调用其析构函数
Tkinter app class never calls its destructor
问：
我在 Python 中制作 Tkinter 类时遇到问题。 我有以下类，由于我添加了图形（initStatistics 方法），我的 Tkinter 应用程序不会停止。
问题是我需要它停止才能“持久化”数据库并保存数据帧。
import tkinter as tk
from tkinter import ttk
import pandas as pd
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg
from matplotlib import pyplot as plt
import seaborn as sns
from pandastable import Table
import database as db
sns.set_theme()
class GUI():
def __init__(self): # Constructor
print("TRACE : Constructor")
self.categories = { # true = entrant
'Choisir' : None,
'Bourses' : True,
'Remboursements' : True,
'Stage' : True,
'Virement parents' : True,
'Blablacar' : True,
'Cours particuliers' : True,
'Transports' : False,
'Loisirs' : False,
'Loyer' : False,
'Cadeaux' : False,
'Sorties' : False,
'Abonnements' : False,
'Autre' : False,
'Courses' : False,
}
self.root = tk.Tk()
self.root.title("Tableur de l'espace")
self.root.state('zoomed') # Pour maximiser à l'ouverture
# Tabs
self.tabControl = ttk.Notebook(self.root)
self.tabHome = ttk.Frame(self.tabControl)
self.tabControl.add(self.tabHome, text="Home")
self.tabTable = ttk.Frame(self.tabControl)
self.tabControl.add(self.tabTable, text="Historique")
self.tabTransaction = ttk.Frame(self.tabControl)
self.tabControl.add(self.tabTransaction, text="Nouvelle transaction")
self.tabControl.pack(expand=1, fill="both")
# Init Home
self.th_lab_balance = tk.Label(self.tabHome, text="Solde actuel : ")
self.th_lab_balance.grid(row=0, column=1, sticky="ew")
self.th_lab_balance.config(font = ("Courier", 14))
# Init table of transactions
self.dfTransactions = db.load().sort_values('date', ascending=False)
self.table = Table(self.tabTable, dataframe=self.dfTransactions, showtoolbar=True, showstatusbar=True)
self.table.show()
self.initStatistics()
# Launch
print("TRACE : mainloop")
self.root.mainloop()
def initStatistics(self):
categoriesEntrant = {k:v for (k,v) in self.categories.items() if v}
categoriesSortant = {k:v for (k,v) in self.categories.items() if not v}
dfEntrant = self.dfTransactions.loc[(self.dfTransactions["categorie"].isin(categoriesEntrant) | self.dfTransactions["categorie"].isin(['SoldeInitial']))==True]
dfSortant = self.dfTransactions.loc[self.dfTransactions["categorie"].isin(categoriesSortant)==True]
# Current balance
balance = str(round(dfEntrant['entrant'].sum() - dfSortant['sortant'].sum(), 2)) + "€"
self.th_lab_balance_nb = tk.Label(self.tabHome, text=balance)
self.th_lab_balance_nb.grid(row=0, column=2, sticky="ew")
self.th_lab_balance_nb.config(font = ("Courier", 14))
# Plots
dfEntrant = dfEntrant.loc[dfEntrant["categorie"].isin(['SoldeInitial'])==False] # remove soldeInitial
dfEntrantSommeParCategorie = dfEntrant.groupby('categorie')['entrant'].sum()
dfSortantSommeParCategorie = dfSortant.groupby('categorie')['sortant'].sum()
lf = ttk.Labelframe(self.tabHome, text='Plot Area')
lf.grid(row=0, column=0, sticky="nsew")
fig, axes = plt.subplots(nrows=2, ncols=1)
fig1 = dfEntrantSommeParCategorie.plot.pie(y="Entrant", ax=axes[0])
fig2 = dfSortantSommeParCategorie.plot.pie(y="Sortant", ax=axes[1])
fig1.axis("off")
fig2.axis("off")
fig1.set_title("Recettes par catégories")
fig2.set_title("Dépenses par catégories")
plt.tight_layout()
self.plot = FigureCanvasTkAgg(fig, master=lf)
self.plot.get_tk_widget().pack()
def __del__(self) : # Destructor
print("TRACE : Destructor")
db.save(self.dfTransactions)
display = GUI()
del display
我试图从我的代码中删除上述方法，然后调用析构函数。不过，我无法弄清楚问题出在哪里。
答：
1赞
LiiVion
6/9/2023
#1
您可以使用以下代码示例。正如@Thingamabobs已经建议的那样，您可以在杀死 gui 之前使用 run aWM_DELETE_WINDOWfunction
from tkinter import *
def exit():
root.destroy()
# sys.exit() <-- if you want to stop your whole script, not just the gui
root = Tk()
root.geometry('800x600')
root.protocol('WM_DELETE_WINDOW', exit) # calling the exit function on closing
root.mainloop()
我建议使用 tkinter 类，因为它使处理变得容易得多。下面是一个示例，如何将 Tkinter 与类一起使用。inherited
from tkinter import *
import sys
class GUI(Tk): # inherited from the Tk Class > used as root window
def __init__(self):
super().__init__() # Init from Tk Class
self.geometry('800x600')
self.destroy_button = Button(self, text='Click to Destroy root', command=self.destroy_button_event)
self.destroy_button.pack(pady=50)
self.custom_frame = CustomFrame(self, width=400, height=200, background='black')
self.custom_frame.pack(expand=True, fill=BOTH, pady=200)
def destroy_button_event(self):
self.destroy()
# sys.exit() <-- if you want to stop your whole script, not just the gui
class CustomFrame(Frame):
def __init__(self, master, **kwargs):
super().__init__(master, **kwargs)
self.destroy_frame_button = Button(self, text='Click to Destroy frame', command=self.destroy_frame_button_event)
self.destroy_frame_button.pack()
def destroy_frame_button_event(self):
self.destroy()
if __name__ == '__main__':
gui = GUI()
gui.mainloop()
评论
0赞
Arolan
6/10/2023
多谢。这似乎奏效了。我会听从你关于继承:)的建议
评论
self.root.protocol('WM_DELETE_WINDOW', self.destructor_method)mainloop()__init__()