Question

我正在班级列表柜台上做一个程序。我有一个程序，在“人口计数”下面的第5帧中，并且它表示0，每次点击“添加到班级列表”按钮时，它意味着增加1。我尝试了很多不同的方法，但我尝试过的所有方法似乎都没有用。如果有人能提供帮助，那将是非常感激的。

到目前为止，这是我的编码，其余的我为班级列表计数器做了

import pickle
import os.path
from tkinter import *
import tkinter.messagebox
import tkinter as tk

class Class:
    def __init__(self, firstname, lastname):
        self.firstname = firstname
        self.lastname = lastname

class ClassPopulation():
    def __init__(self):
        window = Tk()
        window.title("Class population")

        self.firstnameVar = StringVar()
        self.lastnameVar = StringVar()

        frame1 = Frame(window)
        frame1.pack()
        Label(frame1, text = "First name").grid(row = 1,
            column = 1, sticky = W)
        Entry(frame1, textvariable = self.firstnameVar,
              width = 40).grid(row = 1, column = 2)

        frame2 = Frame(window)
        frame2.pack()
        Label(frame2, text = "Last name").grid(row = 1, column = 1, sticky = W)
        Entry(frame2, textvariable = self.lastnameVar,
              width = 40).grid(row = 1, column = 2)

        frame3 = Frame(window)
        frame3.pack()
        Button(frame3, text = "Add to classlist", 
            command = self.processAdd).grid(row = 1, column = 1)

        frame4 = Frame(window)
        frame4.pack()
        Label(frame4, text = "Population Count").grid(row = 1, column = 1, sticky = W)

        frame5 = Frame(window)
        frame5.pack()
        Label(frame5, text = "0").grid(row = 1, column = 1, sticky = W)
        population = 0

    def population(label):
        population = 0

    def mbutton():
        global population
        population +=1
        label.config(text=str(population))

        self.classList = self.loadClass()
        self.current = 0

        if len(self.classList) > 0:
            self.setClass()

    def saveClass(self):
        outfile = open("Population.dat", "wb")
        pickle.dump(self.classList, outfile)
        tkinter.messagebox.showinfo("Class Population","New name registered")
        outfile.close()

    def loadClass(self):
        if not os.path.isfile("Population.dat"):
            return [] # Return an empty list
        try:
            infile = open("Population.dat", "rb")
            classList = pickle.load(infile)
        except EOFError:
            classList = []

        infile.close()
        return classList

    def processAdd(self):
        classList = Class(self.firstnameVar.get(), self.lastnameVar.get())
        self.classList.append(classList)
        self.saveClass()


    def setClass(self):
        self.firstnameVar.set(self.classList[self.current].firstname)
        self.lastnameVar.set(self.classList[self.current].lastname)


ClassPopulation()

Answer 1

您需要在population方法中声明self.population = 0并在按钮点击处理程序中增加__init__，而不是使用全局 self.population 。通常也可以使用类方法来获取值。

Answer 2

可能的解决方案：如果你想要做的就是拥有人口数，并在每次点击按钮时增加它：

import pickle
import os.path
from tkinter import *
import tkinter.messagebox
import tkinter as tk

class Class:
    def __init__(self, firstname, lastname):
        self.firstname = firstname
        self.lastname = lastname

class ClassPopulation():
    def __init__(self):
        window = Tk()
        window.title("Class population")

        self.firstnameVar = StringVar()
        self.lastnameVar = StringVar()

        frame1 = Frame(window)
        frame1.pack()
        Label(frame1, text = "First name").grid(row = 1,
              column = 1, sticky = W)
        Entry(frame1, textvariable = self.firstnameVar,
              width = 40).grid(row = 1, column = 2)

        frame2 = Frame(window)
        frame2.pack()
        Label(frame2, text = "Last name").grid(row = 1, column = 1, sticky = W)
        Entry(frame2, textvariable = self.lastnameVar,
              width = 40).grid(row = 1, column = 2)

        frame3 = Frame(window)
        frame3.pack()
        Button(frame3, text = "Add to classlist", 
            command = self.processAdd).grid(row = 1, column = 1)

        frame4 = Frame(window)
        frame4.pack()
        Label(frame4, text = "Population Count").grid(row = 1, column = 1, sticky = W)

        frame5 = Frame(window)
        frame5.pack()
        Label(frame5, text = "0").grid(row = 1, column = 1, sticky = W)
        # population = 0
        self.population = 0 # made it a class attr

    # def population(label):
    #     population = 0

    def add_population(self):
        # having it separate can help in modification or enhancement
        self.population +=1

    def mbutton():
        # global population
        # population +=1
        self.add_population() # increment 
        label.config(text=str(population))

        self.classList = self.loadClass()
        self.current = 0

        if len(self.classList) > 0:
            self.setClass()

    def saveClass(self):
        outfile = open("Population.dat", "wb")
        pickle.dump(self.classList, outfile)
        tkinter.messagebox.showinfo("Class Population","New name registered")
        outfile.close()

    def loadClass(self):
        if not os.path.isfile("Population.dat"):
            return [] # Return an empty list
        try:
            infile = open("Population.dat", "rb")
            classList = pickle.load(infile)
        except EOFError:
            classList = []

        infile.close()
        return classList

    def processAdd(self):
        classList = Class(self.firstnameVar.get(), self.lastnameVar.get())
        self.classList.append(classList)
        self.saveClass()


    def setClass(self):
        self.firstnameVar.set(self.classList[self.current].firstname)
        self.lastnameVar.set(self.classList[self.current].lastname)


ClassPopulation()

编辑1 ：我添加了完整的代码，包含我建议的更改 - 之前的语句已被注释，因此您了解更改。

计算在我的程序中单击按钮的次数

2 个答案: