Feat: doctest for operation between Token and str

mapytex/calculus/API/tokens/token.py

@@ -122,6 +122,10 @@ class Token(object):
         ...    print(i)
         3 + 7
         10
+        >>> a = Integer(3)
+        >>> c = a + "x"
+        >>> c
+        <Linear x + 3>
         >>> from .number import Fraction 
         >>> a = Fraction("4/3")
         >>> b = Integer(7)
@@ -156,6 +160,9 @@ class Token(object):
         >>> c = a * 7
         >>> c
         <Integer 21>
+        >>> c = a * "x"
+        >>> c
+        <Linear 3x>
         >>> from .number import Fraction 
         >>> a = Fraction("4/3")
         >>> b = Integer(7)
@@ -227,6 +234,9 @@ class Token(object):
         >>> c = 7 + a
         >>> c
         <Integer 10>
+        >>> c = "x" + a
+        >>> c
+        <Linear x + 3>
         """
         return self._roperate(other, "+")
 
@@ -239,6 +249,9 @@ class Token(object):
         >>> c = 7 * a
         >>> c
         <Integer 21>
+        >>> c = "x" * a
+        >>> c
+        <Linear 3x>
         """
         return self._roperate(other, "*")