How to stop a function from another function?

Question

TOKEN = 'token'
bot = telebot.TeleBot(TOKEN)

def main():
   for i in range(0,100):
      print(i)

@bot.message_handler(commands=['start'])
def start(message):
  main()

@bot.message_handler(commands=['stop'])
def stopfunc(message):
   #how to stop the function main() ?

while True:
   bot.polling()

Answer 1

Add stop flag :

• Add logic to main function : when stop flag is True, the main function should return
• In stopfunc set the stop flag is True

stop = False
def main():
   global stop
   for i in range(0,100):
       if stop:
          break
       print(i)
    
@bot.message_handler(commands=['stop'])
def stopfunc(message):
    global stop
    stop = True       

...