python 2.5 compatibility

_compatibility.py

@@ -2,9 +2,12 @@
 This is a compatibility module, to make it possible to use jedi also with older
 python versions.
 """
+import sys
+
 def is_py3k():
     return sys.hexversion >= 0x03000000
-import sys
+
+is_py25 = sys.hexversion < 0x02060000
 
 # next was defined in python 2.6, in python 3 obj.next won't be possible
 # anymore

keywords.py

@@ -7,8 +7,12 @@ import pydoc
 try:
     from pydoc_data import topics as pydoc_topics
 except ImportError:
-    # Python 2.5/2.6
+    # Python 2.6
+    try:
         import pydoc_topics
+    except ImportError:
+        # Python 2.5
+        pydoc_topics = None
 
 if is_py3k():
     keys = keyword.kwlist
@@ -63,4 +67,4 @@ def imitate_pydoc(string):
     except TypeError:
         return ''
 
-    return pydoc_topics.topics[label]
+    return pydoc_topics.topics[label] if pydoc_topics else ''

test/regression.py

@@ -6,6 +6,7 @@ import unittest
 os.chdir(os.path.dirname(os.path.abspath(__file__)) + '/..')
 sys.path.append('.')
 
+from _compatibility import is_py25
 import functions
 #functions.set_debug_function(functions.debug.print_to_stdout)
 
@@ -56,6 +57,7 @@ class TestRegression(unittest.TestCase):
     def test_keyword_doc(self):
         r = list(self.get_def("or", (1,1)))
         assert len(r) == 1
+        if not is_py25:
             assert len(r[0].doc) > 100
 
         r = list(self.get_def("asfdasfd", (1,1)))
@@ -64,6 +66,7 @@ class TestRegression(unittest.TestCase):
     def test_operator_doc(self):
         r = list(self.get_def("a == b", (1,3)))
         assert len(r) == 1
+        if not is_py25:
             assert len(r[0].doc) > 100
 
     def test_get_definition_at_zero(self):