diff --git a/calculator/calculator.py b/calculator/calculator.py
index fefdb7e33bab79a3a78c60dcbe91e14e539c1d06..28de3839219276aff0149bd51abc3b6ab9dd6883 100644
--- a/calculator/calculator.py
+++ b/calculator/calculator.py
@@ -2,7 +2,7 @@
 This Calculator holds the logic for the calculator.
 """
 from calculator.operators import Operator, STANDARD_OPERATORS
-from calculator.expression import Token, Term, Expression, TermExpression, OperatorExpression
+from calculator.expression import Term, Expression, TermExpression, OperatorExpression
 
 
 class Calculator:
@@ -17,8 +17,10 @@ class Calculator:
         if operators is None:
             operators = STANDARD_OPERATORS
         self.operators = operators
-
     def tokenize(self, line: str):
+        """
+        ok
+        """
         tokens = []
         for token in line.split():
             if token in self.operators:
diff --git a/calculator/expression.py b/calculator/expression.py
index 1a27f0c5c27494a971e1479b48bd5c6da9f3ae59..460b13f1a5dfec8e6c203e7cbe6e343f2ba5b3e3 100644
--- a/calculator/expression.py
+++ b/calculator/expression.py
@@ -1,9 +1,10 @@
 """
 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]
 
diff --git a/calculator/operators.py b/calculator/operators.py
index f855332c2cbd379592f4dba51d8c8c66e8c1593d..46a70ac89a4958749f5d5fea41c639805184855e 100644
--- a/calculator/operators.py
+++ b/calculator/operators.py
@@ -6,9 +6,9 @@ class Operator:
     Operator class is a binary operator with a symbol, a precedence and an evaluation function.
     """
     def __init__(self, symbol, precedence, evaluate_function):
-      self.symbol = symbol
-      self.precedence = precedence
-      self.evaluate_function = evaluate_function
+        self.symbol = symbol
+        self.precedence = precedence
+        self.evaluate_function = evaluate_function
 
     def __repr__(self):
         return self.symbol
@@ -17,4 +17,6 @@ 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)}
diff --git a/calculator/server.py b/calculator/server.py
index e0dc49ae37812a16bb365a45c95771af16f114b5..99154c6b18ff5614eeb69f2107eb54e263aa0756 100644
--- a/calculator/server.py
+++ b/calculator/server.py
@@ -1,7 +1,10 @@
-from calculator.calculator import Calculator
+"""
+caca
+"""
 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")