Feat(MO): Initiate MOpolynomial

mapytex/calculus/core/MO/monomial.py

@@ -61,8 +61,9 @@ class MOstrPower(MO):
 
         _tree = Tree("^",
                      self._variable,
-                     self._power
+                     self._power,
                      )
+
         MO.__init__(self, _tree)
 
     @property
@@ -77,11 +78,12 @@ class MOMonomial(MO):
 
     """ Monomial math object"""
 
-    def __init__(self, coefficient, variable):
+    def __init__(self, coefficient, variable, power=1):
         """ Initiate the MOMonomial
 
         :param coefficient: coefficient of the monomial (a non zero constant)
-        :param variable: variable of the monomial (a MOstr or later a MOSqrt)
+        :param variable: variable of the monomial (a MOstr, a MOstrPower)
+        :param power: degree of the monomial
 
         >>> x = MOstr('x')
         >>> MOMonomial(4, x)
@@ -99,14 +101,27 @@ class MOMonomial(MO):
             raise MOError("The coefficient of a monomial should not be 0")
         self._coefficient = _coefficient
 
-        if not isinstance(variable, (MOstr, MOstrPower)):
+        if isinstance(variable, MOstrPower):
-            raise 
+            _variable = variable.variable
-        self._variable = variable
+            _power = MO.factory(variable.power.value * power)
+        elif isinstance(variable, MOstr):
+            _variable = variable
+            _power = MO.factory(power)
+        else:
+            raise MOError(f"variable need to be a MOstrPower or a MOstr. Got {type(variable)}.")
 
+        self._variable = _variable
+        self._power = _power
+
+        if self._power == 1:
             _tree = Tree("*",
                         self._coefficient,
                         self._variable
-
+                        )
+        else:
+            _tree = Tree("*",
+                        self._coefficient,
+                        MOstrPower(self._variable, self._power)
                         )
 
         MO.__init__(self, _tree)
@@ -117,21 +132,15 @@ class MOMonomial(MO):
 
     @property
     def strpower(self):
-        if isinstance(self._variable, MOstr):
+        return MOstrPower(self._variable, self._power)
-            return self._variable
-        return self._variable
 
     @property
     def variable(self):
-        if isinstance(self._variable, MOstr):
         return self._variable
-        return self._variable.variable
 
     @property
     def power(self):
-        if isinstance(self._variable, MOstr):
+        return self._power
-            return 1
-        return self._variable.power
 
 # -----------------------------
 # Reglages pour 'vim'

mapytex/calculus/core/MO/polynomial.py

@@ -10,6 +10,7 @@ from mapytex.calculus.core.tree import Tree
 from .mo import MO, MOnumber, MOstr
 from .exceptions import MOError
 from ..renders import tree2txt, tree2tex
+from .monomial import MOMonomial
 
 __all__ = ["MOpolynomial"]
 
@@ -25,13 +26,13 @@ class MOpolynomial(MO):
 
         :example:
         >>> MOpolynomial('x', [1, 2, 3])
-        3x^2 + 2x + 1
+        <MOpolynomial 3x^2 + 2x + 1>
         >>> MOpolynomial('x', [1, 0, 3])
-        3x^2 + 1
+        <MOpolynomial 3x^2 + 1>
         >>> MOpolynomial('x', {0: 1, 1: 2, 2: 3})
-        3x^2 + 2x + 1
+        <MOpolynomial 3x^2 + 2x + 1>
         >>> MOpolynomial('x', {0: 1, 3: 4})
-        4x^3 + 1
+        <MOpolynomial 4x^3 + 1>
 
 
         """
@@ -41,24 +42,26 @@ class MOpolynomial(MO):
         self._variable = _variable
 
         if isinstance(coefs, dict):
-            _coefs = {MO.factory(d): MO.factory(c) for (d, c) in coefs}
+            _coefs = {MO.factory(d): MO.factory(c) for (d, c) in coefs.items()
+                      if c != 0 }
         elif isinstance(coefs, list):
-            _coefs = {MO.factory(d): MO.factory(c) for (d, c) in enumerate(coefs)}
+            _coefs = {MO.factory(d): MO.factory(c) for (d, c) in enumerate(coefs)
+                      if c != 0 }
         else:
             raise TypeError("Coefs needs to be a dictionnary or a list")
         self._coefs = _coefs
 
         monomials = []
-        for deg, coef in self._coefs:
+        for deg, coef in self._coefs.items():
             if deg == 0:
                 monomials.append(coef)
-            elif deg == 1:
+            else:
-                monomials.append(coef)
+                monomials.append(
-        value = Tree("^",
+                    MOMonomial(coef, self._variable, deg)
-                     self._variable,
-                     self._power
                 )
-        MO.__init__(self, value)
+
+        tree = Tree.from_list("+", monomials[::-1])
+        MO.__init__(self, tree)
 
     @property
     def variable(self):