Change ** to ^ and mod test in render

formal.py

@@ -35,7 +35,7 @@ class FormalExp(object):
         :returns: a_n
 
         """
-        pattern = "\w\*\*(\d*)"
+        pattern = "\w\^(\d*)"
         finder = re.compile(pattern)
         power = {}
         for (k,v) in self._coef.items():
@@ -138,9 +138,9 @@ class FormalExp(object):
 
 if __name__ == '__main__':
     fe1 = FormalExp({"x": 1, "":2})    
-    print(fe1)
-    fe2 = FormalExp({"x**12": 5, "":2})    
-    print(fe2)
+    print(fe1.get_postfix())
+    fe2 = FormalExp({"x^12": 5, "":2})    
+    print(fe2.get_postfix())
     fe3 = fe1 * fe2
     for s in fe3:
         print(s)

render.py

@@ -243,13 +243,12 @@ tex_render = Render(tex_infix, tex_postfix, tex_other, type_render = tex_type_re
 
 if __name__ == '__main__':
     exp = [2, 5, '+', 1, '-', 3, 4, '*', '/']
-    print(txt(exp))
+    print(txt_render(exp))
     exp = [2, 5, '+', 1, '-', 3, 4, '*', '/', 3, '+']
-    print(tex(exp))
+    print(tex_render(exp))
     exp = [2, 5, '+', 1, '-', 3, 4, '*', '/', 3, '+']
     print(post2in_fix(exp))
     
-
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