Recently as a task for school we’ve been making a basic program with a GUI and classes but me and my classmates have run into an issue where if a zero is at the front of the entry it often breaks. Everything works perfectly fine other than this one scenario (to see an example run it and type “0111” into the student/senior entry and press total cost) and I was wondering what the reason for this is, any ideas?

I’ve tried fixing it via removing leading zeros of the “self.amt.get()” variable but I’ve found that it may be an issue with the entry box itself and that I can’t actually access the value, I believe its a Tkinter issue but I’d happily be proven wrong, code is below:

from tkinter import *
#Program Title: Ticket Booking System
#Date: 7/5/24
#Purpose: To allow a user to book tickets for an event
#Version: 3.0
tickets = {}
pricing = {"Child":5,"Adult":15,"Student/Senior":10}
class Ticket:
    def __init__(self,type):
        self.type = type
        self.lbl_text = (f"{self.type}: ${pricing[self.type]}")
        self.amt = IntVar()
    def lbl_print(self):
        labels = Label(window,text=self.lbl_text)
        labels.grid(row=list(pricing.keys()).index(self.type),column=0,sticky="WE",ipady=8,ipadx=15)
    def ent_print(self):
        entries = Entry(window,textvariable=self.amt)
        entries.grid(row=list(pricing.keys()).index(self.type),column=1,sticky="WE",ipady=8,ipadx=15)
    def calculate(self):
        return ((self.amt.get())**2)**0.5 * pricing[self.type]
def calculate_total():
    global total_tickets
    total_tickets = 0
    for i in pricing:
        total_tickets += tickets[i].amt.get()
    if total_tickets > 100:
        total_lbl = Label(window, text="Too many tickets")
    else:
        total_cost = sum(tickets[i].calculate() for i in pricing)
        total_lbl = Label(window, text=f"${total_cost:.2f}")
    total_lbl.grid(row=len(pricing), column=1, sticky="WE", ipady=8, ipadx=15)
window = Tk()
window.title("Ticket Booking")
for i in pricing:
    tickets[i] = Ticket(i)
    tickets[i].lbl_print()
    tickets[i].ent_print()
calculate_total()
total_btn = Button(window, text="Calculate Total", command=calculate_total)
total_btn.grid(row=len(pricing), column=0, sticky="WE", ipady=8, ipadx=15)
window.mainloop()