Feat: Defaut render is tex when Expression is imported from mapytex

mapytex/__init__.py

@@ -2,6 +2,9 @@
 # encoding: utf-8
 
 from .calculus import Expression#, Polynom, Fraction, random_str, txt, Equation
+
+Expression.RENDER = 'tex'
+
 #from .stat import Dataset, WeightedDataset
 #from .geometry import random_pythagore
 

mapytex/calculus/API/expression.py

@@ -153,7 +153,7 @@ class Expression(object):
         return renders[self.RENDER](self._tree)
 
     def __repr__(self):
-        return f"<Exp: {renders[self.RENDER](self._tree)}>"
+        return f"<Exp: {renders['txt'](self._tree)}>"
 
     def _order(self, exclude_nodes=["*", "/", "**"]):
         """ Order the expression base on types