[api] Remove all ABCMeta super classes

Author: srittau

NEWS.rst

@@ -1,6 +1,11 @@
 News in version 0.99.3
 ======================
 
+API-Incompatible Changes
+------------------------
+
+* Revert deriving from ABC classes.
+
 News in version 0.99.2
 ======================
 

htmlgen/element.py

@@ -1,4 +1,3 @@
-import collections
 import sys
 
 from htmlgen.generator import Generator, HTMLChildGenerator
@@ -15,11 +14,11 @@
     str_class = basestring
 
 
-def is_element(object, element_name):
+def is_element(o, element_name):
     """Return whether a given object is a certain element generator."""
-    return (isinstance(object, collections.Iterable) and
-            hasattr(object, "element_name") and
-            object.element_name == element_name)
+    return (hasattr(o, "__iter__") and
+            hasattr(o, "element_name") and
+            o.element_name == element_name)
 
 
 class _ElementBase(Generator):
@@ -179,7 +178,7 @@ def _style_value(self):
         return "; ".join(rendered_styles)
 
 
-class _ElementDataProxy(collections.MutableMapping):
+class _ElementDataProxy:
 
     """Dictionary-like object for setting data-* attributes.
 
@@ -258,7 +257,7 @@ def generate_children(self):
         raise NotImplementedError()
 
 
-class Element(NonVoidElement, collections.Sized):
+class Element(NonVoidElement):
 
     """Base generator for HTML elements with children.
 

htmlgen/generator.py

@@ -1,4 +1,3 @@
-from collections import Iterable, Sized
 import sys
 
 if sys.version_info[0] < 3:
@@ -12,7 +11,7 @@
     unicode = str
 
 
-class Generator(Iterable):
+class Generator(object):
 
     """Base class for HTML generators.
 
@@ -102,7 +101,7 @@ def generate(self):
             yield item
 
 
-class ChildGenerator(Generator, Sized):
+class ChildGenerator(Generator):
 
     """A generator that generates children appended to it.
 
@@ -170,7 +169,7 @@ def generate(self):
         return iter(self._children)
 
 
-class HTMLChildGenerator(Generator, Sized):
+class HTMLChildGenerator(Generator):
 
     """A generator that handles HTML safely.