Need help with pseuo -bank account using OOP

[obieze998]

def enter_pin():
     while True:
      pin = int( input("Enter pin "))# keeps asking for the correct pin 
      if pin in data:
         d = data[pin]
         while True:
    
             return data[pin]
       if pin[0] in 'qQ':
            break
       else:
           print("INCORRECT PIN TRY AGAIN")

My code currently looks like this

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right it's throwing an issue with if pin[0] in 'qQ':, saying the int' object is not subscriptable