make it work

calculator/calculator.py

@@ -18,7 +18,7 @@ class Calculator:
             operators = STANDARD_OPERATORS
         self.operators = operators
 
-    def tokenize(self, line: str) -> list[Token]:
+    def tokenize(self, line: str):
         tokens = []
         for token in line.split():
             if token in self.operators:
@@ -31,7 +31,7 @@ class Calculator:
                     raise ValueError(f"Invalid token {token}") from exc
         return tokens
 
-    def parse(self, tokens: list[Token]) -> Expression:
+    def parse(self, tokens) -> Expression:
         """
         Parse a list of tokens into an ordered expression.
         """