Python 对文本输入框使用验证

我正在尝试设置文本输入框的验证。其中三个框只需接受整数和一个文本作为邮政编码。我不确定是在以前定义的函数中还是在创建输入框时执行此操作。另外，如何使文本输入框中的值在函数QuoteCreation中可访问。我所有的代码都在下面

     from tkinter import *


class quote():  
 def __init__(self, master):

    self.master=master

    self.master.title("Quote Screen")
    self.master.geometry("2100x1400")

    self.master.configure(background = "white")
    self.Borras = PhotoImage(file = "Borras.Logo.2.gif") #sets up image
    self.Borras.image = self.Borras
    self.BorrasLabel = Label(self.master, image = self.Borras, bg = "white")#puts image onto label
    self.BorrasLabel.place(anchor=NW)

    self.Title = Label(self.master, text = "New Quote", font = ("calibri", 20), bg = "White")
    self.Title.place(x=650, y = 10)

    self.SubmitButton = PhotoImage(file = "Submit.Button.gif") #sets up image
    self.SubmitButton.image = self.SubmitButton
    self.SubmitButtonLabel = Button(self.master, image = self.SubmitButton, bg = "white", command= self.QuoteCreation)#puts image onto a button
    self.SubmitButtonLabel.place(x=900, y=290)




    PostCodeVar = StringVar() 
    PostCodeEntry = Entry(master,width=50, font=20, textvariable=PostCodeVar)
    PostCodeEntry.place(x = 20, y = 150)
    PostCodeVar.set("Please enter the Post Code")
    PostCodeValue = PostCodeVar.get()

    HeightVar = StringVar() 
    HeightEntry = Entry(master, width=50, font=20, textvariable=HeightVar)
    HeightEntry.place(x = 20, y = 220)
    HeightVar.set("Please enter the Height") 
    HeightValue = HeightVar.get() 

    LengthVar = StringVar()
    LengthEntry = Entry(master, width=50, font=20, textvariable=LengthVar)
    LengthEntry.place(x = 20, y = 290)
    LengthVar.set("Please enter the Length")
    LengthValue = LengthVar.get() 

    PitchVar = StringVar() 
    PitchEntry = Entry(master, width=50, font=20, textvariable=PitchVar)
    PitchEntry.place(x = 20, y = 360)
    PitchVar.set("Please enter the Pitch") 
    PitchValue = PitchVar.get() 

    RiseVar = StringVar() 
    RiseEntry = Entry(master, width=50, font=20, textvariable=RiseVar)
    RiseEntry.place(x = 20, y = 430)
    RiseVar.set("Please enter the Rise") 
    RiseValue = RiseVar.get() 

    self.SubmitButton = PhotoImage(file = "Submit.Button.gif") 
    self.SubmitButton.image = self.SubmitButton
    self.SubmitButtonLabel = Button(self.master, image = self.SubmitButton, bg = "white", command= self.QuoteCreation)#puts image onto a button
    self.SubmitButtonLabel.place(x=900, y=290)




def on_button(self):
    print(self.entry.get())

def QuoteCreation(self):
    print(' ')

def quitWindow(self):
    self.master.destroy()  

def backToWelcome(self):
    self.master.destroy() 

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当按下submit按钮时，您可以设置单独的函数来处理验证

例如，您的提交按钮可能看起来有点像：

submitButton = Button(master, text="Submit", command=validation)

在您的情况下，验证人员希望执行以下检查：

def validation():
    postcode = PostCodeVar.get()
    length = LengthVar.get()
    pitch = PitchVar.get()
    rise = RiseVar.get()

    if postcodeCheck(postcode) == True and length.isdigit() == True and pitch.isdigit() == True and rise.isdigit() == True:
        #carry out chosen process

在您的情况下，您可以尝试在调用函数之前设置邮政编码、长度、间距和高度变量，并将它们设置为全局变量。应创建邮政编码，如果可以，则功能应：

return True

…因此它与if语句的结果相匹配

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我希望这就是您所寻找的，并且可以根据您的具体问题调整示例

您希望验证在用户键入时进行，还是仅在他们单击“提交”按钮后进行？我希望验证在“提交”按钮上进行，但如果可能，希望默认文本在用户单击框时消失。我注意到您从未接受任何问题的任何答案。如果你不想，那完全没关系。只是提醒你这个功能。