IN PYTHON: Write a program bank.py that simulates a simple banking system. In this program you must implement functions that can deposit, withdraw, and display the balance. If you implement all functions correctly then you should be able to call start) inside your program and begin testing. Note, the program must impleent the functions below as defined here, or else you will lose points. start() ### This is will your program will initially start and finish at deposit (balance) ### Dep031t3 money into users account and returns the balance afterwards withdraw (balance) ### withdraws money from user3 account and returns the balance afterwards displayBalance (balance) ### This function displays the current balance. PLEASE VIEW BOTH EXAMPLE RUNS IN DETAIL! EXAMPLE RUN #1 Welcome to the UWT bank! Please press 1 to show your balance. Please press 2 to make a withdrawal. Please press 3 to make a deposit. Please press 4 to exit. Pick a choice: 1 You have $500 in your account. Please press 1 to show your balance. Please press 2 to make a withdrawal. Please press 3 to make a deposit Please press 4 to ex Pick a choice: 2 Withdrawal Amount: $200