Feat: Polynomial are displayed in nicer order!

mapytex/calculus/core/MO/polynomial.py

@@ -6,6 +6,7 @@
 #
 # Distributed under terms of the MIT license.
 
+from collections import OrderedDict
 from mapytex.calculus.core.tree import Tree
 from . import MO, MOstr
 from .mo import Molecule
@@ -57,8 +58,9 @@ class MOpolynomial(Molecule):
             raise TypeError("Coefs needs to be a dictionnary or a list")
         self._coefs = _coefs
 
-        monomials = {}
-        for deg, coef in self._coefs.items():
+        monomials = OrderedDict()
+        for deg in sorted(self._coefs.keys()):
+            coef = self._coefs[deg]
             if deg == 0:
                 monomials[deg] = coef
             elif deg == 1 and coef == 1:
@@ -120,9 +122,9 @@ class MOpolynomial(Molecule):
         :example:
         >>> p = MOpolynomial('x', [1, 2, 3])
         >>> p.monomials
-        {<MOnumber 0>: <MOnumber 1>, <MOnumber 1>: <MOMonomial 2x>, <MOnumber 2>: <MOMonomial 3x^2>}
+        OrderedDict([(<MOnumber 0>, <MOnumber 1>), (<MOnumber 1>, <MOMonomial 2x>), (<MOnumber 2>, <MOMonomial 3x^2>)])
         >>> p.monomials.values()
-        dict_values([<MOnumber 1>, <MOMonomial 2x>, <MOMonomial 3x^2>])
+        odict_values([<MOnumber 1>, <MOMonomial 2x>, <MOMonomial 3x^2>])
         """
         return self._monomials