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how to get my app to show a message box when an entry field is complete and when it's empty?

i'm creating a basic booking page for a test but i cant get the if else statement to work and show a message box when an entry is empty or when the booking is complete, for now every time i click "finish" with values in the entry box i get the message box for when a value is not entered. here is my code:

class Booking():
    def __init__(self, parent):
        self.gui(parent)

    def gui(self, parent):
        if parent == 0:
            self.w1 = Tk()
            self.w1.configure(bg = '#b6d7a8')
            self.w1.geometry('550x550')
            self.combo = Data(0)
            self.check = Data(0)
            self.v = StringVar()
            self.v.set("")
            self.a = StringVar()
            self.a.set("")
            
        else:
            self.w1 = Frame(parent)
            self.w1.configure(bg = '#b6d7a8')
            self.w1.place(x = 0, y = 0, width = 550, height = 550)

        #widgets for booking page
        self.label2 = Label(self.w1, text = "Booking", fg = "#090909", bg = "#da7d30", font = tkinter.font.Font(family = "MS Shell Dlg 2", size = 26), cursor = "arrow", state = "normal")
        self.label2.place(x = 110, y = 15, width = 240, height = 82)
      
        self.combo2 = Combobox(self.w1, value = self.combo.amount, font = tkinter.font.Font(family = "MS Shell Dlg 2", size = 8), cursor = "arrow", state = "normal")
        self.combo2.place(x = 40, y = 250, width = 360, height = 32)
        self.combo2.current(0)
        self.button5 = Button(self.w1, text = "Finish booking ", bg = "#da7d30", fg = "#040404", font = tkinter.font.Font(family = "MS Shell Dlg 2", size = 8), cursor = "arrow", state = "normal", command=self.finish)
        self.button5.place(x = 430, y = 340, width = 90, height = 42)
        self.button5 = Button(self.w1, text = "Cancel booking ", bg = "#da7d30", fg = "#040404", font = tkinter.font.Font(family = "MS Shell Dlg 2", size = 8), cursor = "arrow", state = "normal")
        self.button5.place(x = 430, y = 400, width = 90, height = 42)
        
        self.text4 = Entry(self.w1, bg = "#f7f7f7", textvariable=self.v, font = tkinter.font.Font(family = "MS Shell Dlg 2", size = 8), cursor = "arrow", state = "normal")
        self.text4.place(x = 40, y = 160, width = 140, height = 40)
        self.text6 = Entry(self.w1, bg = "#f7f7f7", textvariable=self.v, font = tkinter.font.Font(family = "MS Shell Dlg 2", size = 8), cursor = "arrow", state = "normal")
        self.text6.place(x = 250, y = 330, width = 140, height = 40)
        self.text7 = Entry(self.w1, bg = "#f7f7f7", textvariable=self.v, font = tkinter.font.Font(family = "MS Shell Dlg 2", size = 8), cursor = "arrow", state = "normal")
        self.text7.place(x = 40, y = 405, width = 240, height = 100)
        self.text5 = Entry(self.w1, bg = "#f7f7f7", textvariable=self.v,  font = tkinter.font.Font(family = "MS Shell Dlg 2", size = 8), cursor = "arrow", state = "normal")
        self.text5.place(x = 40, y = 330, width = 140, height = 40)

        self.label3 = Label(self.w1, text = "Date",  fg = "#090909", bg = "#da7d30", font = tkinter.font.Font(family = "MS Shell Dlg 2", size = 18), cursor = "arrow", state = "normal")
        self.label3.place(x = 40, y = 120)
        self.label7 = Label(self.w1, text = "Time",  fg = "#090909", bg = "#da7d30", font = tkinter.font.Font(family = "MS Shell Dlg 2", size = 18), cursor = "arrow", state = "normal")
        self.label7.place(x = 250, y = 120)
        self.combo5 = Combobox(self.w1, value = self.check.time, font = tkinter.font.Font(family = "MS Shell Dlg 2", size = 18), cursor = "arrow", state = "normal")
        self.combo5.place(x = 250, y = 160, width = 140, height = 40)
        self.combo5.current(0)
        self.label3 = Label(self.w1, text = "Amount of people",  fg = "#090909", bg = "#da7d30", font = tkinter.font.Font(family = "MS Shell Dlg 2", size = 16), cursor = "arrow", state = "normal")
        self.label3.place(x = 40, y = 210)

    
        self.label5 = Label(self.w1, text = "Date",  fg = "#090909", bg = "#da7d30",  font = tkinter.font.Font(family = "MS Shell Dlg 2", size = 18), cursor = "arrow", state = "normal")
        self.label5.place(x = 40, y = 120)
       
        self.label8 = Label(self.w1, text = "First name",  fg = "#090909", bg = "#da7d30", font = tkinter.font.Font(family = "MS Shell Dlg 2", size = 18), cursor = "arrow", state = "normal")
        self.label8.place(x = 40, y = 290)
        self.label9 = Label(self.w1, text = "Last name", fg = "#090909", bg = "#da7d30", font = tkinter.font.Font(family = "MS Shell Dlg 2", size = 18), cursor = "arrow", state = "normal")
        self.label9.place(x = 250, y = 290)
        self.label9 = Label(self.w1, text = "Comments (optional)",  fg = "#090909", bg = "#da7d30", font = tkinter.font.Font(family = "MS Shell Dlg 2", size = 12), cursor = "arrow", state = "normal")
        self.label9.place(x = 40, y = 375)

    #functions for booking page 

    def finish(self):
        try:
            self.v.get()
            value = self.v.get()
            if  (self.v.get() == 0):
                messagebox.showinfo(title="Error", message="You must fill out everything!")  
            elif (self.v.get() ==1):
                messagebox.showinfo(title="Booking", message="Your booking has been complete")
                self.text4.delete(END)
                self.text6.delete(END)
                self.text5.delete(END) 
        except ValueError:
            print("")


source https://stackoverflow.com/questions/74061791/how-to-get-my-app-to-show-a-message-box-when-an-entry-field-is-complete-and-when
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