Inquiry regarding Python function.

def deposit(balance, money):
    print("Deposit Completed" The balance is {} won."format(balance + money))
    # # return balance + money

def withdraw(balance, money):
    if balance >= money:
        print("Withdrawal completed. The balance is {} won."format(balance - money))
        return balance - money
    else:
        print("Insufficient balance". The balance is {} won."format(balance))
        return balance

balance = 0
balance = deposit(balance, 1000)
balance = withdraw(balance, 2000)

Traceback (most recent call last):
  File "c:\Users\User\Desktop\PythonWorkspace\practice.py", line 848, in <module>
    balance = withdraw(balance, 2000)
  File "c:\Users\User\Desktop\PythonWorkspace\practice.py", line 839, in withdraw
    if balance >= money:
TypeError: '>=' not supported between instances of 'NoneType' and 'int'