#You could do return amount at the end of a function and when you call the function you could do something like balance = deposit() - ping

def Withdraw(amount):
     num = input("Withdraw amount: ")
     num = float(num)
     if (num <= amount):
          amount = (amount - num)
     else:
          print ("\nInsufficent funds.")
     print ("\nTotal: $" + str(amount))
     return amount

def Deposit(amount):
     num = input("Deposit amount: ")
     num = float(num)
     if (num <= amount):
          amount = (amount + num)
     print ("\nTotal: $" + str(amount))
     return amount

new_username = input("Please set a username: ")
new_password = input("Please set a password: ")
print ("User saved")



while True:
     print ("\nWelcome to PythonBank. Please enter your account credentials.")
     username = input("\nUsername: ")
     if username == new_username:
               password = input("Password: ")
               if password == new_password:
                         print ("Succesfully logged in as " + new_username)
                         while True:
                              amount = 2000
                              amount = float(amount)
                              print ("")

                              operation = input("What would you like to do? \n(Balance, Withdraw, Deposit, Checkings, Savings, Logout): ")
                              operation = operation.lower()

                              if operation == ("balance"):
                                   print ("\nTotal: $" + str(amount))

                              if operation == ("withdraw"):
                                  amount = Withdraw(amount)

                              if operation == ("deposit"):
                                   amount = Deposit(amount)

                              if operation == ("Checkings"):
                                   print ("Todo")


                              if operation == ("Savings"):
                                   print ("Todo")


                              if operation == ("logout"):
                                   break




               else: print ("\nFailed to login. Please check your spelling and try again.")