Changed pytz support not to check for the presence of pytz. We know pytz

will be present. Changes as per Andreas's request.

doc/CHANGES.txt

@@ -173,9 +173,9 @@ Zope Changes
         view to work. (patch by Sidnei da Silva from Enfold,
         integration by Martijn Faassen (Startifact) for Infrae)
 
-      - DateTime now uses pytz for time zone data if available. This
-        means support for more time zones and up to date daylight
-        saving time information.
+      - DateTime now uses pytz for time zone data. This means support
+        for more time zones and up to date daylight saving time
+        information.
 
     Bugs Fixed
 

lib/python/DateTime/DateTime.py

@@ -22,11 +22,7 @@ from datetime import datetime
 from interfaces import IDateTime
 from interfaces import DateTimeError, SyntaxError, DateError, TimeError
 from zope.interface import implements
-try:
-    from pytz_support import PytzCache    
-except ImportError:
-    # pytz not available, use legacy timezone support
-    PytzCache = None
+from pytz_support import PytzCache    
 
 default_datefmt = None
 
@@ -992,11 +988,7 @@ class DateTime:
     # For backward compatibility only:
     _isDST = localtime(time())[8]
     _localzone  = _isDST and _localzone1 or _localzone0
-
-    if PytzCache is not None:
-        _tzinfo = PytzCache(_cache())
-    else:
-        _tzinfo = _cache()
+    _tzinfo = PytzCache(_cache())
 
     def localZone(self, ltm=None):
         '''Returns the time zone on the given date.  The time zone
@@ -2049,6 +2041,5 @@ class strftimeFormatter:
 # Module methods
 def Timezones():
     """Return the list of recognized timezone names"""
-    if PytzCache is not None:
-        return list(PytzCache(_cache())._zlst)
-    return _cache._zlst
+    return list(PytzCache(_cache())._zlst)
+

lib/python/DateTime/pytz.txt

 Pytz Support
 ============
-If the pytz package is importable, it will be used for time zone
-information, otherwise, DateTime's own time zone database is used. The
+
+Allows the pytz package to be used for time zone information. The
 advantage of using pytz is that it has a more complete and up to date
 time zone and daylight savings time database.
 
-This test assumes that pytz is available.
-
-    >>> import pytz
-
 Usage
 -----
-If pytz is available, then DateTime will use it. You don't have to do
-anything special to make it work.
+You don't have to do anything special to make it work.
 
     >>> from DateTime import DateTime, Timezones
     >>> d = DateTime('March 11, 2007 US/Eastern')
@@ -53,9 +48,9 @@ Let's compare this to 2006.
     -18000
 
 Time Zones
-----------
-When pytz is available, DateTime can use its large database of time
-zones. Here are some examples:
+---------
+DateTime can use pytz's large database of time zones. Here are some
+examples:
 
     >>> d = DateTime('Pacific/Kwajalein')
     >>> d = DateTime('America/Shiprock')
@@ -75,13 +70,12 @@ the pytz database.
     >>> d = DateTime('iceland')
 
 These time zones use DateTimes database. So it's preferable to use the
-official time zone name when you have pytz installed.
+official time zone name.
 
 One trickiness is that DateTime supports some zone name
-abbreviations. Some of these map to pytz names, so when pytz is
-present these abbreviations will give you time zone date from
-pytz. Notable among abbreviations that work this way are 'est', 'cst',
-'mst', and 'pst'.
+abbreviations. Some of these map to pytz names, so these abbreviations
+will give you time zone date from pytz. Notable among abbreviations
+that work this way are 'est', 'cst', 'mst', and 'pst'.
 
 Let's verify that 'est' picks up the 2007 daylight savings time changes.
 
@@ -115,7 +109,7 @@ The following are tests of internal components.
 
 Cache
 ~~~~~
-When pytz is present, the DateTime class uses a different time zone cache.
+The DateTime class uses a new time zone cache.
 
     >>> DateTime._tzinfo #doctest: +ELLIPSIS
     <DateTime.pytz_support.PytzCache instance at ...>

lib/python/DateTime/tests/testDateTime.py

@@ -509,20 +509,12 @@ class DateTimeTests(unittest.TestCase):
 
 def test_suite():
     from zope.testing import doctest
-    try:
-        # if pytz is available include a test for it
-        import pytz
-        return unittest.TestSuite([
-            unittest.makeSuite(DateTimeTests),
-            doctest.DocFileSuite('DateTime.txt', package='DateTime'),
-            doctest.DocFileSuite('pytz.txt', package='DateTime'),
-            ])
-
-    except ImportError:
-        return unittest.TestSuite([
-            unittest.makeSuite(DateTimeTests),
-            doctest.DocFileSuite('DateTime.txt', package='DateTime')
-            ])
+    return unittest.TestSuite([
+        unittest.makeSuite(DateTimeTests),
+        doctest.DocFileSuite('DateTime.txt', package='DateTime'),
+        doctest.DocFileSuite('pytz.txt', package='DateTime'),
+        ])
+
 
 if __name__=="__main__":
     unittest.main(defaultTest='test_suite')