adapt abstract_polynom to new init

pymath/calculus/abstract_polynom.py

@@ -56,8 +56,6 @@ class AbstractPolynom(Explicable):
         >>> AbstractPolynom([1, 2, 3], name = "Q").name
         'Q'
         """
-        super(AbstractPolynom, self).__init__()
-
         try:
             # Remove 0 at the end of the coefs
             while coefs[-1] == 0:
@@ -79,6 +77,9 @@ class AbstractPolynom(Explicable):
 
         self._isPolynom = 1
         
+        pstf_tokens = self.compute_postfix_tokens()
+        super(AbstractPolynom, self).__init__(pstf_tokens)
+
     def feed_coef(self, l_coef):
         """Feed coef of the polynom. Manage differently whether it's a number or an expression
 
@@ -166,8 +167,7 @@ class AbstractPolynom(Explicable):
 
         return ans
 
-    @property
-    def postfix_tokens(self):
+    def compute_postfix_tokens(self):
         """Return the postfix form of the polynom
 
         :returns: the postfix list of polynom's tokens
@@ -204,10 +204,9 @@ class AbstractPolynom(Explicable):
         [2, 3, +, 'x', *, 1, +]
 
         """
-        if self == 0:
+        if not [i for i in self._coef if i!= 0]:
             return [0]
-        # TODO: Faudrait factoriser un peu tout ça..! |dim. déc. 21 16:02:34
-        # CET 2014
+
         postfix = []
         for (i, a) in list(enumerate(self._coef))[::-1]:
             operator = [op.add]
@@ -288,8 +287,10 @@ class AbstractPolynom(Explicable):
         elif isPolynom(other):
             return other
         else:
-            raise ValueError(type(other) +
-                             " can't be converted into a polynom")
+            raise ValueError(
+                    type(other) +
+                    " can't be converted into a polynom"
+                    )
 
     def reduce(self):
         """Compute coefficients which have same degree