python27 compatibility + representation

Author: laco

gladiator/commons.py

@@ -22,6 +22,9 @@ def __init__(self, type_, validator, obj, selector, ctx, **kw):
             self.results = kw.pop('results', [])
         self.kw = kw
 
+    def __nonzero__(self):
+        return self.__bool__()
+
     def __bool__(self):
         raise NotImplemented
 
@@ -53,12 +56,23 @@ def _error_list(self):
         err_list = []
         for r in self.results:
             if not r.success:
-                if r.type_ == 'primitive':
+                if r.type_ == ValidatorType.primitive:
                     err_list.append((selector_as_string(r.selector), r.error))
-                elif r.type_ == 'composite':
+                elif r.type_ == ValidatorType.composite:
                     err_list += r._error_list()
         return err_list
 
+    def __repr__(self):
+        if self.type_ == ValidatorType.primitive:
+            return "{0}[{1}]".format(
+                self.__class__.__name__,
+                selector_as_string(self.selector))
+        elif self.type_ == ValidatorType.composite:
+            return '{0}({1}{2})'.format(
+                self.__class__.__name__,
+                '',
+                ', '.join([repr(r) for r in self.results]))
+
 
 class Success(ValidationResult):
 

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py34
+envlist = py34,py27,py26,pypy3
 [testenv]
 deps=pytest # install pytest in the venvs
 commands=py.test -s tests/ # or 'nosetests' or ...