lint-correction

calculator/expression.py

 """
 Expression module defines the structure of an expression.
 """
-from calculator.operators import Operator
 from typing import Union
+from calculator.operators import Operator
 
 Term: type = int
 Token: type = Union[Operator, Term]

calculator/operators.py

@@ -17,4 +17,7 @@ class Operator:
         return self.evaluate_function(left, right)
 
 
-STANDARD_OPERATORS = { '+': Operator('+', 1, lambda a, b: a + b),'-': Operator('-', 1, lambda a, b: a - b),'*': Operator('×', 2, lambda a, b: a * b),'/': Operator('/', 2, lambda a, b: a / b)}
+STANDARD_OPERATORS = { '+': Operator('+', 1, lambda a, b: a + b),
+                      '-': Operator('-', 1, lambda a, b: a - b),
+                      '*': Operator('×', 2, lambda a, b: a * b),
+                      '/': Operator('/', 2, lambda a, b: a / b)}

calculator/server.py

-from calculator.calculator import Calculator
 from fastapi import FastAPI
 from fastapi.requests import Request
 from fastapi.templating import Jinja2Templates
+from calculator.calculator import Calculator
 
 app = FastAPI()
 templates = Jinja2Templates(directory="calculator/templates")