diff --git a/calculus.py b/calculus.py
index c7ef0d7..10461be 100644
--- a/calculus.py
+++ b/calculus.py
@@ -86,12 +86,15 @@ def computePostfixBis(postfixExp):
     :returns: the result of the expression
 
     """
+    print(postfixExp)
     print(postfixToInfix(postfixExp))
     # where to save numbers or 
     operandeStack = Stack()
 
     tokenList = postfixExp.split(" ")
 
+    steps = []
+
     # On fait le calcul jusqu'à n'avoir plus qu'un élément
     while len(tokenList) > 1:
         tmpTokenList = []
@@ -114,10 +117,15 @@ def computePostfixBis(postfixExp):
                 del tokenList[0]
         tmpTokenList += tokenList
 
-        tokenList = expand_list(tmpTokenList)
-        print(postfixToInfix(" ".join(tokenList)))
+        steps += expand_list(tmpTokenList)
+        #print("----- Steps -----")
+        #print(steps)
 
-    return tokenList[0]
+        tokenList = steps[-1]
+
+        #print(postfixToInfix(tokenList))
+
+    return steps
 
 def isNumber(exp):
     """Check if the expression can be a number
@@ -126,11 +134,16 @@ def isNumber(exp):
     :returns: True if the expression can be a number and false otherwise
 
     """
-    tokenList = exp.split(" ")
-    if len(tokenList) != 1:
-        # si l'expression est trop longue pour être un chiffre
-        return 0
-    return exp.isdigit() or (exp[0] == "-" and exp[1:].isdigit())
+    return type(exp) == int or type(exp) == "Fraction"
+
+def isOperation(exp):
+    """Check if the expression is an opération in "+-*/"
+
+    :param exp: an expression
+    :returns: boolean
+
+    """
+    return (type(exp) == str and exp in "+-*/")
 
 
 def doMath(op, op1, op2):
@@ -183,12 +196,14 @@ def needPar(operande, operator, posi = "after"):
     """
     priority = {"*" : 3, "/": 3, "+": 2, "-":2}
 
-    if isNumber(operande) and "-" in operande:
+    if type(operande)==int and operande < 0:
         return 1
     elif not isNumber(operande):
         # Si c'est une grande expression ou un chiffre négatif
         stand_alone = get_main_op(operande)
         # Si la priorité de l'operande est plus faible que celle de l'opérateur
+        debug_var("stand_alone",stand_alone)
+        debug_var("operande", type(operande))
         minor_priority = priority[get_main_op(operande)] < priority[operator]
         # Si l'opérateur est -/ pour after ou juste / pour before
         special = (operator in "-/" and posi == "after") or (operator in "/" and posi == "before")
@@ -238,7 +253,7 @@ def expand_list(list_list):
     >>> expand_list([1,2,[3,4],5,[6,7,8]])
     [[1, 2, 3, 5, 6], [1, 2, 4, 5, 7], [1, 2, 4, 5, 8]]
     >>> expand_list([1,2,4,5,6,7,8])
-    [1, 2, 4, 5, 6, 7, 8]
+    [[1, 2, 4, 5, 6, 7, 8]]
 
     """
     list_in_list = [i for i in list_list if type(i) == list].copy()
@@ -253,10 +268,21 @@ def expand_list(list_list):
                     ans[i][j] = e[min(i,len(e)-1)]
     # S'il n'y a pas eut d'étapes intermédiaires (2e exemple)
     except ValueError:
-        ans = list_list
+        ans = [list_list]
 
     return ans
 
+def print_steps(steps):
+    """Juste print a list
+
+    :param steps: @todo
+    :returns: @todo
+
+    """
+    print("{first} \t = {sec}".format(first = steps[-1], sec = steps[-2]))
+    for i in steps[-2:0:-1]:
+        print("\t\t = ",i)
+
 
 def debug_var(name, var):
     """print the name of the variable and the value
@@ -277,14 +303,15 @@ def test(exp):
     #print("Postfix " , postfix)
     #print(computePostfix(postfix))
     #print("Bis")
-    print(computePostfixBis(postfix))
+    steps = computePostfixBis(postfix)
+    print_steps(steps)
     #print(postfixToInfix(postfix))
     #print(get_main_op(exp))
 
 
 if __name__ == '__main__':
-    #exp = "1 + 3 * 5"
-    #test(exp)
+    exp = "1 + 3 * 5"
+    test(exp)
 
     #exp = "2 * 3 * 3 * 5"
     #test(exp)
@@ -304,16 +331,25 @@ if __name__ == '__main__':
     #exp = "2 * ( 2 - ( 3 + 4 ) ) + 5 * ( 3 - 4 )"
     #test(exp)
     #
-    exp = "2 + 5 * ( 3 - 4 )"
-    test(exp)
+    #exp = "2 + 5 * ( 3 - 4 )"
+    #test(exp)
+    #
+    #exp = "( 2 + 5 ) * ( 3 - 4 )"
+    #test(exp)
+    #
+    #exp = "( 2 + 5 ) * ( 3 * 4 )"
+    #test(exp)
     
-    exp = "( 2 + 5 ) * ( 3 - 4 )"
+    exp = "( 2 + 5 - 1 ) / ( 3 * 4 )"
     test(exp)
-    
-    exp = "( 2 + 5 ) * ( 3 * 4 )"
+
+    exp = "( 2 + 5 ) / ( 3 * 4 ) + 1 / 12"
     test(exp)
-    
-    exp = "( 2 + 5 ) / ( 3 * 4 )"
+
+    exp = "( 2 + 5 ) / ( 3 * 4 ) + 1 / 2"
+    test(exp)
+
+    exp = "( 2 + 5 ) / ( 3 * 4 ) + 1 / 12 + 5 * 5"
     test(exp)
 
     #print(expand_list([1,2,['a','b','c'], 3, ['d','e']]))
diff --git a/fraction.py b/fraction.py
index b3153f0..a405ca3 100644
--- a/fraction.py
+++ b/fraction.py
@@ -22,23 +22,25 @@ class Fraction(object):
 
         :returns: steps to simplify the fraction or the fraction if there is nothing to do
         """
-        steps = [str(self)]
+        steps = [self]
 
         if self._denom < 0:
             self._num = - self._num
             self._denom = - self._denom
-            steps += [str(self)]
+            steps += [self]
 
         gcd_ = gcd(abs(self._num), abs(self._denom))
         if self._num == self._denom:
             self._num = 1
             self._denom = 1
-            steps += [str(self)]
+            steps += [self]
 
         elif gcd_ != 1:
             self._num, self._denom = self._num // gcd_ , self._denom // gcd_
             steps += ["( {reste1} * {gcd} ) / ( {reste2} * {gcd} )".format(reste1 = self._num, reste2 = self._denom, gcd = gcd_)]
-            steps += [str(self)]
+
+            # Certainement le truc le plus moche que j'ai jamais fait... On ne met que des strings dans steps puis au dernier moment on met une fraction. C'est moche de ma part
+            steps += [self]
 
         return steps
 
@@ -47,6 +49,9 @@ class Fraction(object):
             return str(self._num)
         else:
             return str(self._num) + " / " + str(self._denom)
+
+    #def __repr__(self):
+    #    return self.__str__()
     
     def __add__(self, other):
         if type(other) == Fraction: