added type hints to all functions

Author: sheida-shab

sprint5-prep/prep2-exercise.py

@@ -1,14 +1,14 @@
-def open_account(balances: dict[str,int], name : str, amount:int):
+def open_account(balances: dict[str,int], name : str, amount:int) -> None:
     balances[name] = amount
 
-def sum_balances(accounts):
+def sum_balances(accounts : dict[str,int]) -> int:
     total = 0
     for name, pence in accounts.items():
         print(f"{name} had balance {pence}")
         total += pence
     return total
 
-def format_pence_as_string(total_pence):
+def format_pence_as_string(total_pence :int) -> str:
     if total_pence < 100:
         return f"{total_pence}p"
     pounds = int(total_pence / 100)