fixed some import statements, added test code

nltk/tbl/demo.py

@@ -209,11 +209,11 @@ def postag(
     # defaults
     baseline_backoff_tagger = baseline_backoff_tagger or REGEXP_TAGGER
     if templates is None:
-        from nltk.tag.tbl.task import postagging
+        from nltk.tag.brill import describe_template_sets, brill24
         # some pre-built template sets taken from typical systems or publications are
-        # available. Print a list with postagging.describe_template_sets()
+        # available. Print a list with describe_template_sets()
         # for instance:
-        templates = postagging.brill24()
+        templates = brill24()
     (training_data, baseline_data, gold_data, testing_data) = \
        _demo_prepare_data(tagged_data, train, num_sents, randomize, separate_baseline_data)
 

nltk/tbl/feature.py

@@ -60,7 +60,7 @@ class Feature(object):
         >>> Pos(2, 1)
         Traceback (most recent call last):
           File "<stdin>", line 1, in <module>
-          File "nltk/tag/tbl/template.py", line 306, in __init__
+          File "nltk/tbl/template.py", line 306, in __init__
             raise TypeError
         ValueError: illegal interval specification: (start=2, end=1)
 
@@ -258,3 +258,8 @@ class Feature(object):
         :rtype: any (but usually scalar)
         """
         raise NotImplementedError
+
+
+if __name__ == "__main__":
+    import doctest
+    doctest.testmod(optionflags=doctest.NORMALIZE_WHITESPACE)

nltk/tbl/rule.py

@@ -307,3 +307,8 @@ class Rule(TagRule):
         conditions = (' if ' if self._conditions else "") + ', and '.join(
             [condition_to_str(f,v) for (f,v) in self._conditions])
         return replacement + conditions
+
+
+if __name__ == "__main__":
+    import doctest
+    doctest.testmod(optionflags=doctest.NORMALIZE_WHITESPACE)

nltk/tbl/template.py

@@ -306,3 +306,6 @@ class Template(BrillTemplateI):
 
 
 
+if __name__ == "__main__":
+    import doctest
+    doctest.testmod(optionflags=doctest.NORMALIZE_WHITESPACE)