Python tkinter - 更改由循環創建的Label，我該怎么辦？

Question

我為它讀了很多書，我覺得沒有適合我的解決方案。

上下文：用戶必須在條目中輸入 6 位計算編號。 9x 條目由循環創建。 我寫了條件來檢測用戶是否犯了錯誤：包含少於或多於 6 位或 / 並包含字母的數字。 他們正在工作，我測試了他們。 只接受 6 位數字（如果為 0，沒關系，因為這意味着用戶只需要獲得少於 9 個文檔）。

目標：如果用戶犯了一個錯誤，則“0”位置處的“數字錯誤”消息必須出現在相關和“錯誤”條目旁邊。

一切都將通過一個按鈕激活。

我嘗試了什么：使用列表，但它不起作用。

如何更改循環動態創建的 Label？

    user_entries=[]
    error_list_length=[0,0,0,0,0,0,0,0,0]
    error_list_letters=[0,0,0,0,0,0,0,0,0]
    error_calculation_list=[0,0,0,0,0,0,0,0,0]
    nbofcalc=9
    a=0
    b=1
    ddd=791250

#------ Function to check if the entered calculation number are composed of 6 characters (mandatory)    
    def check_calc_number():
        global gg_error
        gg=0
        gg_error=0
        while gg<nbofcalc:
            if len(user_entries[gg].get()) != 6:
                if len(user_entries[gg].get()) ==0:
                    gg_error+=0
                    error_list_length[gg]=0
                else:
                    gg_error+=1
                    error_list_length[gg]=1
            else:
                gg_error+=0
                error_list_length[gg]=0
               
            gg+=1

#------ Function to check if the entered calculation number contains a or many letters (prohibited)
    def check_calc_letter():
        global hh_error
        hh=0
        hh_error=0
        alphabet_x='a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'
        for x in range(nbofcalc):
            for n in user_entries[hh].get():
                if n in alphabet_x:
                    hh_error+=1
                    error_list_letters[hh]=1
                    
            hh+=1

#------ Function to check with entries has an error and update the list "error_calculation_list" to try to displays the message "Error in the number" next to the concerned entries      
    def error_length_letters_display():
        ww=0
        while ww<nbofcalc:
            if error_list_length[ww]==1 :
                error_calculation_list[ww]="Error"
                var_calculation.set(error_calculation_list[ww])
                if error_list_letters[ww]==1:
                    error_calculation_list[ww]="Error"
                    var_calculation.set(error_calculation_list[ww])
                   
            ww+=1

#----- Loop to crate the entries and Label 
    for x in range(nbofcalc):
        cadre1=Frame(fenetre)
        cadre1.pack(side=TOP,anchor=NW)
        cadre=Frame(cadre1)
        cadre.pack()
        c=str(b)
        calc=Label(cadre,text="Calculation "+c+"  ")
        calc.pack(side=LEFT)
        var_entry=StringVar()

        my_entry=Entry(cadre,textvariable=var_entry, bd=5)
        my_entry.insert(0,ddd)
        my_entry.pack(side=LEFT)
        var_calculation=StringVar()
        var_calculation.set(error_calculation_list[a])
        calc_error_frame=Label(cadre, textvariable=var_calculation) # The Label to change if error
        calc_error_frame.pack(side=RIGHT)
        user_entries.append(my_entry)
        a+=1
        b+=1
        ddd+=1

謝謝 ！

Answer 1

您可以存儲需要更改的值和對象，然后您可以動態地更改它們。 看這個例子

from tkinter import *
r =  Tk()

my_entries = []
for i in range(5):
    e = Label(r, text=i)
    my_entries.append(e)
    e.pack(side='top')
    
r.after(4000, lambda: my_entries[2].configure(text='Example'))
r.mainloop()

編輯 1 ：正如 TheLizzard 和 Cool Cloud 指出的，在使用 tkinter 時最好避免使用 time.sleep time.sleep() 。 替換為非阻塞after()

Answer 2

您可以為 tk.StringVar() 設置跟蹤 function，當用戶在 Entry 中輸入任何值時，將對其進行檢查。 例如，如下所示，用戶只能輸入小數，您也可以設置長度。

    def create_widgets(self):
        self.vars = tk.StringVar()
        self.vars.trace('w', partial(self.validate2, 1, 1))
        # Min Voltage Validating Part
        self.vars1 = tk.StringVar()
        self.vars1.trace('w', partial(self.validate2, 2, 2))
        # Max Voltage Validating Part
        self.vars2 = tk.StringVar()
        self.vars2.trace('w', partial(self.validate2, 3, 4))
        # Current Validating Part
        self.vars3 = tk.StringVar()
        self.vars3.trace('w', partial(self.validate2, 4, 3))
        # Channel Validating Part
        # function( key, size)

        self.enter_info = tk.Label(self, text="Please enter your information: ", bg="lightgrey")
        self.enter_info.grid(tke_Table_EnterInfo)

        self.voltage = tk.Label(self)
        self.voltage["text"] = "MinVoltage"
        self.voltage.grid(tke_Label_MinVoltage)
        self.voltageInput = tk.Entry(self, width=10, textvariable=self.vars).grid(tke_StringBox_MinVoltage)
        self.vars.set(0)
        # Min Voltage Validating Part
        self.current = tk.Label(self)
        self.current["text"] = "MaxVoltage"
        self.current.grid(tke_Label_MaxVoltage)
        self.currentInput = tk.Entry(self, width=10, textvariable=self.vars1).grid(tke_StringBox_MaxVoltage)
        self.vars1.set(5)
        # Max Voltage Validating Part
        self.power = tk.Label(self)
        self.power["text"] = "Current"
        self.power.grid(tke_Label_MaxCurrent)
        self.powerInput = tk.Entry(self, width=10, textvariable=self.vars2).grid(tke_StringBox_MaxCurrent)
        self.vars2.set(62.5)
        # Max Current Validating Part

        self.channel = tk.Label(self)
        self.channel["text"] = "channel"
        self.channel.grid(tke_Label_Channel)
        self.channelInput = tk.Entry(self, width=10, textvariable=self.vars3).grid(tke_StringBox_Channel)
        self.vars3.set(8)
        # Max Channel Validating Part


    def validate2(self, key, size, *args):
        # TODO:add more information
        if key == 1:
            value = self.vars.get()
        elif key == 2:
            value = self.vars1.get()
        elif key == 3:
            value = self.vars2.get()
        else:
            value = self.vars3.get()

        if not value.isdecimal():
            print(len(value))
            # if len(value) < 2:
            corrected = ''.join(filter(str.isdecimal, value))
            if key == 1:
                self.vars.set(corrected)
            elif key == 2:
                self.vars1.set(corrected)
            elif key == 3:
                self.vars2.set(corrected)
            else:
                self.vars3.set(corrected)
        if key == 1:
            corrected = self.vars.get()
            corrected = corrected[0:size]
            self.vars.set(corrected)
        elif key == 2:
            corrected = self.vars1.get()
            corrected = corrected[0:size]
            self.vars1.set(corrected)
        elif key == 3:
            corrected = self.vars2.get()
            corrected = corrected[0:size]
            self.vars2.set(corrected)
        else:
            corrected = self.vars3.get()
            corrected = corrected[0:size]
            self.vars3.set(corrected)