Tuve algunos problemas de sintaxis pero los resolvi. Gracias ^^

userEnBD = "sielle"
passwordEnBD = "123456"
balance = 1000

def validateUser(u, c):
 if u == userEnBD and c == passwordEnBD:
   return True
 return False

def login():
 print("Welcome to Sielle's Bank!")
 user = input("Enter your Username ")
 password = input("Enter your Password ")
 return validateUser(user, password)

def withraw(value):
 if value > balance: 
   return False, balance

 return True, balance - value

def deposit(value):
 return True, balance + value

def action(option):
 if option == 1:
   value = int(input("Please, Write the amount to Deposit "))
   return deposit(value)

 if option == 2:
   value = int(input("Please, Write the amount to Withraw "))
   return withraw(value)

 return False, balance

def run():
 if not login():
   print("Invalid user or password")
   return

 print("What would you like to do?")
 option = int(input("1. Deposit or 2.  Withraw "))

 ok, balance = action(option)
 if not ok:
   print("Sorry, We cant proccess the transaction, balance:", balance)
 else:
   print("Action carried out successfully! Your new Balance is:", balance)

run() ```