diff --git a/dateutil/rrule.py b/dateutil/rrule.py
--- a/dateutil/rrule.py
+++ b/dateutil/rrule.py
@@ -65,6 +65,7 @@ class weekday(object):
     def __init__(self, weekday, n=None):
         if n == 0:
             raise ValueError("Can't create weekday with n == 0")
+
         self.weekday = weekday
         self.n = n
 
@@ -92,17 +93,29 @@ def __repr__(self):
 MO, TU, WE, TH, FR, SA, SU = weekdays = tuple([weekday(x) for x in range(7)])
 
 
+def _invalidates_cache(f):
+    """
+    Decorator for rruleset methods which may invalidate the
+    cached length.
+    """
+    def inner_func(self, *args, **kwargs):
+        rv = f(self, *args, **kwargs)
+        self._invalidate_cache()
+        return rv
+
+    return inner_func
+
+
 class rrulebase(object):
     def __init__(self, cache=False):
         if cache:
             self._cache = []
             self._cache_lock = _thread.allocate_lock()
-            self._cache_gen = self._iter()
-            self._cache_complete = False
+            self._invalidate_cache()
         else:
             self._cache = None
             self._cache_complete = False
-        self._len = None
+            self._len = None
 
     def __iter__(self):
         if self._cache_complete:
@@ -112,6 +125,17 @@ def __iter__(self):
         else:
             return self._iter_cached()
 
+    def _invalidate_cache(self):
+        if self._cache is not None:
+            self._cache = []
+            self._cache_complete = False
+            self._cache_gen = self._iter()
+
+            if self._cache_lock.locked():
+                self._cache_lock.release()
+
+        self._len = None
+
     def _iter_cached(self):
         i = 0
         gen = self._cache_gen
@@ -1275,16 +1299,19 @@ def __init__(self, cache=False):
         self._exrule = []
         self._exdate = []
 
+    @_invalidates_cache
     def rrule(self, rrule):
         """ Include the given :py:class:`rrule` instance in the recurrence set
             generation. """
         self._rrule.append(rrule)
 
+    @_invalidates_cache
     def rdate(self, rdate):
         """ Include the given :py:class:`datetime` instance in the recurrence
             set generation. """
         self._rdate.append(rdate)
 
+    @_invalidates_cache
     def exrule(self, exrule):
         """ Include the given rrule instance in the recurrence set exclusion
             list. Dates which are part of the given recurrence rules will not
@@ -1292,6 +1319,7 @@ def exrule(self, exrule):
         """
         self._exrule.append(exrule)
 
+    @_invalidates_cache
     def exdate(self, exdate):
         """ Include the given datetime instance in the recurrence set
             exclusion list. Dates included that way will not be generated,

diff --git a/dateutil/test/test_rrule.py b/dateutil/test/test_rrule.py
--- a/dateutil/test/test_rrule.py
+++ b/dateutil/test/test_rrule.py
@@ -2,6 +2,7 @@
 from __future__ import unicode_literals
 from ._common import WarningTestMixin, unittest
 
+import calendar
 from datetime import datetime, date
 from six import PY3
 
@@ -2634,136 +2635,6 @@ def testCachePostContains(self):
         for x in rr: pass
         self.assertEqual(datetime(1997, 9, 3, 9, 0) in rr, True)
 
-    def testSet(self):
-        set = rruleset()
-        set.rrule(rrule(YEARLY, count=2, byweekday=TU,
-                        dtstart=datetime(1997, 9, 2, 9, 0)))
-        set.rrule(rrule(YEARLY, count=1, byweekday=TH,
-                        dtstart=datetime(1997, 9, 2, 9, 0)))
-        self.assertEqual(list(set),
-                         [datetime(1997, 9, 2, 9, 0),
-                          datetime(1997, 9, 4, 9, 0),
-                          datetime(1997, 9, 9, 9, 0)])
-
-    def testSetDate(self):
-        set = rruleset()
-        set.rrule(rrule(YEARLY, count=1, byweekday=TU,
-                        dtstart=datetime(1997, 9, 2, 9, 0)))
-        set.rdate(datetime(1997, 9, 4, 9))
-        set.rdate(datetime(1997, 9, 9, 9))
-        self.assertEqual(list(set),
-                         [datetime(1997, 9, 2, 9, 0),
-                          datetime(1997, 9, 4, 9, 0),
-                          datetime(1997, 9, 9, 9, 0)])
-
-    def testSetExRule(self):
-        set = rruleset()
-        set.rrule(rrule(YEARLY, count=6, byweekday=(TU, TH),
-                        dtstart=datetime(1997, 9, 2, 9, 0)))
-        set.exrule(rrule(YEARLY, count=3, byweekday=TH,
-                        dtstart=datetime(1997, 9, 2, 9, 0)))
-        self.assertEqual(list(set),
-                         [datetime(1997, 9, 2, 9, 0),
-                          datetime(1997, 9, 9, 9, 0),
-                          datetime(1997, 9, 16, 9, 0)])
-
-    def testSetExDate(self):
-        set = rruleset()
-        set.rrule(rrule(YEARLY, count=6, byweekday=(TU, TH),
-                        dtstart=datetime(1997, 9, 2, 9, 0)))
-        set.exdate(datetime(1997, 9, 4, 9))
-        set.exdate(datetime(1997, 9, 11, 9))
-        set.exdate(datetime(1997, 9, 18, 9))
-        self.assertEqual(list(set),
-                         [datetime(1997, 9, 2, 9, 0),
-                          datetime(1997, 9, 9, 9, 0),
-                          datetime(1997, 9, 16, 9, 0)])
-
-    def testSetExDateRevOrder(self):
-        set = rruleset()
-        set.rrule(rrule(MONTHLY, count=5, bymonthday=10,
-                        dtstart=datetime(2004, 1, 1, 9, 0)))
-        set.exdate(datetime(2004, 4, 10, 9, 0))
-        set.exdate(datetime(2004, 2, 10, 9, 0))
-        self.assertEqual(list(set),
-                         [datetime(2004, 1, 10, 9, 0),
-                          datetime(2004, 3, 10, 9, 0),
-                          datetime(2004, 5, 10, 9, 0)])
-
-    def testSetDateAndExDate(self):
-        set = rruleset()
-        set.rdate(datetime(1997, 9, 2, 9))
-        set.rdate(datetime(1997, 9, 4, 9))
-        set.rdate(datetime(1997, 9, 9, 9))
-        set.rdate(datetime(1997, 9, 11, 9))
-        set.rdate(datetime(1997, 9, 16, 9))
-        set.rdate(datetime(1997, 9, 18, 9))
-        set.exdate(datetime(1997, 9, 4, 9))
-        set.exdate(datetime(1997, 9, 11, 9))
-        set.exdate(datetime(1997, 9, 18, 9))
-        self.assertEqual(list(set),
-                         [datetime(1997, 9, 2, 9, 0),
-                          datetime(1997, 9, 9, 9, 0),
-                          datetime(1997, 9, 16, 9, 0)])
-
-    def testSetDateAndExRule(self):
-        set = rruleset()
-        set.rdate(datetime(1997, 9, 2, 9))
-        set.rdate(datetime(1997, 9, 4, 9))
-        set.rdate(datetime(1997, 9, 9, 9))
-        set.rdate(datetime(1997, 9, 11, 9))
-        set.rdate(datetime(1997, 9, 16, 9))
-        set.rdate(datetime(1997, 9, 18, 9))
-        set.exrule(rrule(YEARLY, count=3, byweekday=TH,
-                        dtstart=datetime(1997, 9, 2, 9, 0)))
-        self.assertEqual(list(set),
-                         [datetime(1997, 9, 2, 9, 0),
-                          datetime(1997, 9, 9, 9, 0),
-                          datetime(1997, 9, 16, 9, 0)])
-
-    def testSetCount(self):
-        set = rruleset()
-        set.rrule(rrule(YEARLY, count=6, byweekday=(TU, TH),
-                        dtstart=datetime(1997, 9, 2, 9, 0)))
-        set.exrule(rrule(YEARLY, count=3, byweekday=TH,
-                        dtstart=datetime(1997, 9, 2, 9, 0)))
-        self.assertEqual(set.count(), 3)
-
-    def testSetCachePre(self):
-        set = rruleset()
-        set.rrule(rrule(YEARLY, count=2, byweekday=TU,
-                        dtstart=datetime(1997, 9, 2, 9, 0)))
-        set.rrule(rrule(YEARLY, count=1, byweekday=TH,
-                        dtstart=datetime(1997, 9, 2, 9, 0)))
-        self.assertEqual(list(set),
-                         [datetime(1997, 9, 2, 9, 0),
-                          datetime(1997, 9, 4, 9, 0),
-                          datetime(1997, 9, 9, 9, 0)])
-
-    def testSetCachePost(self):
-        set = rruleset(cache=True)
-        set.rrule(rrule(YEARLY, count=2, byweekday=TU,
-                        dtstart=datetime(1997, 9, 2, 9, 0)))
-        set.rrule(rrule(YEARLY, count=1, byweekday=TH,
-                        dtstart=datetime(1997, 9, 2, 9, 0)))
-        for x in set: pass
-        self.assertEqual(list(set),
-                         [datetime(1997, 9, 2, 9, 0),
-                          datetime(1997, 9, 4, 9, 0),
-                          datetime(1997, 9, 9, 9, 0)])
-
-    def testSetCachePostInternal(self):
-        set = rruleset(cache=True)
-        set.rrule(rrule(YEARLY, count=2, byweekday=TU,
-                        dtstart=datetime(1997, 9, 2, 9, 0)))
-        set.rrule(rrule(YEARLY, count=1, byweekday=TH,
-                        dtstart=datetime(1997, 9, 2, 9, 0)))
-        for x in set: pass
-        self.assertEqual(list(set._cache),
-                         [datetime(1997, 9, 2, 9, 0),
-                          datetime(1997, 9, 4, 9, 0),
-                          datetime(1997, 9, 9, 9, 0)])
-
     def testStr(self):
         self.assertEqual(list(rrulestr(
                               "DTSTART:19970902T090000\n"
@@ -2939,6 +2810,23 @@ def testStrNWeekDay(self):
                           datetime(1998, 1, 6, 9, 0),
                           datetime(1998, 12, 31, 9, 0)])
 
+    def testStrUntil(self):
+        self.assertEqual(list(rrulestr(
+                              "DTSTART:19970902T090000\n" 
+                              "RRULE:FREQ=YEARLY;"
+                              "UNTIL=19990101T000000;BYDAY=1TU,-1TH\n"
+                              )),
+                         [datetime(1997, 12, 25, 9, 0),
+                          datetime(1998, 1, 6, 9, 0),
+                          datetime(1998, 12, 31, 9, 0)])
+
+    def testStrInvalidUntil(self):
+        with self.assertRaises(ValueError):
+            list(rrulestr("DTSTART:19970902T090000\n"
+                          "RRULE:FREQ=YEARLY;"
+                          "UNTIL=TheCowsComeHome;BYDAY=1TU,-1TH\n"))
+
+
     def testBadBySetPos(self):
         self.assertRaises(ValueError,
                           rrule, MONTHLY,
@@ -4499,3 +4387,277 @@ def testToStrLongIntegers(self):
                                   byweekno=long(2),
                                   dtstart=datetime(1997, 9, 2, 9, 0)))
 
+
+class RRuleSetTest(unittest.TestCase):
+    def testSet(self):
+        rrset = rruleset()
+        rrset.rrule(rrule(YEARLY, count=2, byweekday=TU,
+                          dtstart=datetime(1997, 9, 2, 9, 0)))
+        rrset.rrule(rrule(YEARLY, count=1, byweekday=TH,
+                          dtstart=datetime(1997, 9, 2, 9, 0)))
+        self.assertEqual(list(rrset),
+                         [datetime(1997, 9, 2, 9, 0),
+                          datetime(1997, 9, 4, 9, 0),
+                          datetime(1997, 9, 9, 9, 0)])
+
+    def testSetDate(self):
+        rrset = rruleset()
+        rrset.rrule(rrule(YEARLY, count=1, byweekday=TU,
+                          dtstart=datetime(1997, 9, 2, 9, 0)))
+        rrset.rdate(datetime(1997, 9, 4, 9))
+        rrset.rdate(datetime(1997, 9, 9, 9))
+        self.assertEqual(list(rrset),
+                         [datetime(1997, 9, 2, 9, 0),
+                          datetime(1997, 9, 4, 9, 0),
+                          datetime(1997, 9, 9, 9, 0)])
+
+    def testSetExRule(self):
+        rrset = rruleset()
+        rrset.rrule(rrule(YEARLY, count=6, byweekday=(TU, TH),
+                          dtstart=datetime(1997, 9, 2, 9, 0)))
+        rrset.exrule(rrule(YEARLY, count=3, byweekday=TH,
+                          dtstart=datetime(1997, 9, 2, 9, 0)))
+        self.assertEqual(list(rrset),
+                         [datetime(1997, 9, 2, 9, 0),
+                          datetime(1997, 9, 9, 9, 0),
+                          datetime(1997, 9, 16, 9, 0)])
+
+    def testSetExDate(self):
+        rrset = rruleset()
+        rrset.rrule(rrule(YEARLY, count=6, byweekday=(TU, TH),
+                          dtstart=datetime(1997, 9, 2, 9, 0)))
+        rrset.exdate(datetime(1997, 9, 4, 9))
+        rrset.exdate(datetime(1997, 9, 11, 9))
+        rrset.exdate(datetime(1997, 9, 18, 9))
+        self.assertEqual(list(rrset),
+                         [datetime(1997, 9, 2, 9, 0),
+                          datetime(1997, 9, 9, 9, 0),
+                          datetime(1997, 9, 16, 9, 0)])
+
+    def testSetExDateRevOrder(self):
+        rrset = rruleset()
+        rrset.rrule(rrule(MONTHLY, count=5, bymonthday=10,
+                          dtstart=datetime(2004, 1, 1, 9, 0)))
+        rrset.exdate(datetime(2004, 4, 10, 9, 0))
+        rrset.exdate(datetime(2004, 2, 10, 9, 0))
+        self.assertEqual(list(rrset),
+                         [datetime(2004, 1, 10, 9, 0),
+                          datetime(2004, 3, 10, 9, 0),
+                          datetime(2004, 5, 10, 9, 0)])
+
+    def testSetDateAndExDate(self):
+        rrset = rruleset()
+        rrset.rdate(datetime(1997, 9, 2, 9))
+        rrset.rdate(datetime(1997, 9, 4, 9))
+        rrset.rdate(datetime(1997, 9, 9, 9))
+        rrset.rdate(datetime(1997, 9, 11, 9))
+        rrset.rdate(datetime(1997, 9, 16, 9))
+        rrset.rdate(datetime(1997, 9, 18, 9))
+        rrset.exdate(datetime(1997, 9, 4, 9))
+        rrset.exdate(datetime(1997, 9, 11, 9))
+        rrset.exdate(datetime(1997, 9, 18, 9))
+        self.assertEqual(list(rrset),
+                         [datetime(1997, 9, 2, 9, 0),
+                          datetime(1997, 9, 9, 9, 0),
+                          datetime(1997, 9, 16, 9, 0)])
+
+    def testSetDateAndExRule(self):
+        rrset = rruleset()
+        rrset.rdate(datetime(1997, 9, 2, 9))
+        rrset.rdate(datetime(1997, 9, 4, 9))
+        rrset.rdate(datetime(1997, 9, 9, 9))
+        rrset.rdate(datetime(1997, 9, 11, 9))
+        rrset.rdate(datetime(1997, 9, 16, 9))
+        rrset.rdate(datetime(1997, 9, 18, 9))
+        rrset.exrule(rrule(YEARLY, count=3, byweekday=TH,
+                           dtstart=datetime(1997, 9, 2, 9, 0)))
+        self.assertEqual(list(rrset),
+                         [datetime(1997, 9, 2, 9, 0),
+                          datetime(1997, 9, 9, 9, 0),
+                          datetime(1997, 9, 16, 9, 0)])
+
+    def testSetCount(self):
+        rrset = rruleset()
+        rrset.rrule(rrule(YEARLY, count=6, byweekday=(TU, TH),
+                          dtstart=datetime(1997, 9, 2, 9, 0)))
+        rrset.exrule(rrule(YEARLY, count=3, byweekday=TH,
+                           dtstart=datetime(1997, 9, 2, 9, 0)))
+        self.assertEqual(rrset.count(), 3)
+
+    def testSetCachePre(self):
+        rrset = rruleset()
+        rrset.rrule(rrule(YEARLY, count=2, byweekday=TU,
+                          dtstart=datetime(1997, 9, 2, 9, 0)))
+        rrset.rrule(rrule(YEARLY, count=1, byweekday=TH,
+                          dtstart=datetime(1997, 9, 2, 9, 0)))
+        self.assertEqual(list(rrset),
+                         [datetime(1997, 9, 2, 9, 0),
+                          datetime(1997, 9, 4, 9, 0),
+                          datetime(1997, 9, 9, 9, 0)])
+
+    def testSetCachePost(self):
+        rrset = rruleset(cache=True)
+        rrset.rrule(rrule(YEARLY, count=2, byweekday=TU,
+                          dtstart=datetime(1997, 9, 2, 9, 0)))
+        rrset.rrule(rrule(YEARLY, count=1, byweekday=TH,
+                          dtstart=datetime(1997, 9, 2, 9, 0)))
+        for x in rrset: pass
+        self.assertEqual(list(rrset),
+                         [datetime(1997, 9, 2, 9, 0),
+                          datetime(1997, 9, 4, 9, 0),
+                          datetime(1997, 9, 9, 9, 0)])
+
+    def testSetCachePostInternal(self):
+        rrset = rruleset(cache=True)
+        rrset.rrule(rrule(YEARLY, count=2, byweekday=TU,
+                          dtstart=datetime(1997, 9, 2, 9, 0)))
+        rrset.rrule(rrule(YEARLY, count=1, byweekday=TH,
+                          dtstart=datetime(1997, 9, 2, 9, 0)))
+        for x in rrset: pass
+        self.assertEqual(list(rrset._cache),
+                         [datetime(1997, 9, 2, 9, 0),
+                          datetime(1997, 9, 4, 9, 0),
+                          datetime(1997, 9, 9, 9, 0)])
+
+    def testSetRRuleCount(self):
+        # Test that the count is updated when an rrule is added
+        rrset = rruleset(cache=False)
+        for cache in (True, False):
+            rrset = rruleset(cache=cache)
+            rrset.rrule(rrule(YEARLY, count=2, byweekday=TH,
+                              dtstart=datetime(1983, 4, 1)))
+            rrset.rrule(rrule(WEEKLY, count=4, byweekday=FR,
+                              dtstart=datetime(1991, 6, 3)))
+
+            # Check the length twice - first one sets a cache, second reads it
+            self.assertEqual(rrset.count(), 6)
+            self.assertEqual(rrset.count(), 6)
+
+            # This should invalidate the cache and force an update
+            rrset.rrule(rrule(MONTHLY, count=3, dtstart=datetime(1994, 1, 3)))
+
+            self.assertEqual(rrset.count(), 9)
+            self.assertEqual(rrset.count(), 9)
+
+    def testSetRDateCount(self):
+        # Test that the count is updated when an rdate is added
+        rrset = rruleset(cache=False)
+        for cache in (True, False):
+            rrset = rruleset(cache=cache)
+            rrset.rrule(rrule(YEARLY, count=2, byweekday=TH,
+                              dtstart=datetime(1983, 4, 1)))
+            rrset.rrule(rrule(WEEKLY, count=4, byweekday=FR,
+                              dtstart=datetime(1991, 6, 3)))
+
+            # Check the length twice - first one sets a cache, second reads it
+            self.assertEqual(rrset.count(), 6)
+            self.assertEqual(rrset.count(), 6)
+
+            # This should invalidate the cache and force an update
+            rrset.rdate(datetime(1993, 2, 14))
+
+            self.assertEqual(rrset.count(), 7)
+            self.assertEqual(rrset.count(), 7)
+
+    def testSetExRuleCount(self):
+        # Test that the count is updated when an exrule is added
+        rrset = rruleset(cache=False)
+        for cache in (True, False):
+            rrset = rruleset(cache=cache)
+            rrset.rrule(rrule(YEARLY, count=2, byweekday=TH,
+                              dtstart=datetime(1983, 4, 1)))
+            rrset.rrule(rrule(WEEKLY, count=4, byweekday=FR,
+                              dtstart=datetime(1991, 6, 3)))
+
+            # Check the length twice - first one sets a cache, second reads it
+            self.assertEqual(rrset.count(), 6)
+            self.assertEqual(rrset.count(), 6)
+
+            # This should invalidate the cache and force an update
+            rrset.exrule(rrule(WEEKLY, count=2, interval=2,
+                               dtstart=datetime(1991, 6, 14)))
+
+            self.assertEqual(rrset.count(), 4)
+            self.assertEqual(rrset.count(), 4)
+
+    def testSetExDateCount(self):
+        # Test that the count is updated when an rdate is added
+        for cache in (True, False):
+            rrset = rruleset(cache=cache)
+            rrset.rrule(rrule(YEARLY, count=2, byweekday=TH,
+                              dtstart=datetime(1983, 4, 1)))
+            rrset.rrule(rrule(WEEKLY, count=4, byweekday=FR,
+                              dtstart=datetime(1991, 6, 3)))
+
+            # Check the length twice - first one sets a cache, second reads it
+            self.assertEqual(rrset.count(), 6)
+            self.assertEqual(rrset.count(), 6)
+
+            # This should invalidate the cache and force an update
+            rrset.exdate(datetime(1991, 6, 28))
+
+            self.assertEqual(rrset.count(), 5)
+            self.assertEqual(rrset.count(), 5)
+
+
+class WeekdayTest(unittest.TestCase):
+    def testInvalidNthWeekday(self):
+        with self.assertRaises(ValueError):
+            zeroth_friday = FR(0)
+
+    def testWeekdayCallable(self):
+        # Calling a weekday instance generates a new weekday instance with the
+        # value of n changed.
+        from dateutil.rrule import weekday
+        self.assertEqual(MO(1), weekday(0, 1))
+
+        # Calling a weekday instance with the identical n returns the original
+        # object
+        FR_3 = weekday(4, 3)
+        self.assertIs(FR_3(3), FR_3)
+
+    def testWeekdayEquality(self):
+        # Two weekday objects are not equal if they have different values for n
+        self.assertNotEqual(TH, TH(-1))
+        self.assertNotEqual(SA(3), SA(2))
+
+    def testWeekdayEqualitySubclass(self):
+        # Two weekday objects equal if their "weekday" and "n" attributes are
+        # available and the same
+        class BasicWeekday(object):
+            def __init__(self, weekday):
+                self.weekday = weekday
+
+        class BasicNWeekday(BasicWeekday):
+            def __init__(self, weekday, n=None):
+                super(BasicNWeekday, self).__init__(weekday)
+                self.n = n
+
+        MO_Basic = BasicWeekday(0)
+        
+        self.assertNotEqual(MO, MO_Basic)
+        self.assertNotEqual(MO(1), MO_Basic)
+
+        TU_BasicN = BasicNWeekday(1)
+
+        self.assertEqual(TU, TU_BasicN)
+        self.assertNotEqual(TU(3), TU_BasicN)
+
+        WE_Basic3 = BasicNWeekday(2, 3)
+        self.assertEqual(WE(3), WE_Basic3)
+        self.assertNotEqual(WE(2), WE_Basic3)
+
+    def testWeekdayReprNoN(self):
+        no_n_reprs = ('MO', 'TU', 'WE', 'TH', 'FR', 'SA', 'SU')
+        no_n_wdays = (MO, TU, WE, TH, FR, SA, SU)
+
+        for repstr, wday in zip(no_n_reprs, no_n_wdays):
+            self.assertEqual(repr(wday), repstr)
+
+    def testWeekdayReprWithN(self):
+        with_n_reprs = ('WE(+1)', 'TH(-2)', 'SU(+3)')
+        with_n_wdays = (WE(1), TH(-2), SU(+3))
+
+        for repstr, wday in zip(with_n_reprs, with_n_wdays):
+            self.assertEqual(repr(wday), repstr)
+

ruleset.count() not changing after applying ruleset.exrule()
Seems like the ruleset.count() is getting cached after first call to it. An Example of this behavior -

```
>>> rules = rrule.rruleset()
>>> rules.rrule(rrule.rrule(rrule.DAILY, until=datetime.datetime(2038,1,1,0,0,0), dtstart=datetime.datetime(now.year,now.month,now.day,0,0,0)))
>>> rules.count()
8179
>>> rules.exrule(rrule.rrule(rrule.DAILY, until=datetime.datetime(2038,1,1,0,0,0), dtstart=datetime.datetime(now.year,now.month,now.day,0,0,0)))
>>> rules.count()
8179
```

Only after iterating over the ruleset , do we get the correct value , Example -

```
>>> list(rules)
[]
rules.count()
0
```


The issue here is that `rrulebase` caches the length after the first call to `count()`, and this cache is not invalidated when changes are made to the rruleset:

``` python
from datetime import datetime as dt
from dateutil import rrule as rr

dts = dt(2015, 8, 11)
dte = dt(2016, 8, 11)

crr = rr.rrule(rr.DAILY, dtstart=dts, until=dte)

rules = rr.rruleset()
print(rules.count())
>>> 0

rules.rrule(crr)
print(rules.count())
>>> 0

rules._len = None
print(rules.count())
>>> 367
```

This should be easy enough to fix, I can make sure it's fixed in 2.5.0. I am in general loathe to recommend building anything upon private methods or attributes, but in the meantime, anything that iterates over the rruleset should update the count, so `list(rules)` or something like: `for _ in rules: pass` (this is what `rruleset.count()` would be doing anyway if the cache were properly invalidated anyway, so it shouldn't degrade performance).

Thanks for the bug report!

Pushing fix to 2.5.1 to speed release of 2.5.0.

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(dateutil.test.test_rrule.RRuleTest) testToStrMinutelyInterval (dateutil.test.test_rrule.RRuleTest) testToStrMinutelyIntervalLarge (dateutil.test.test_rrule.RRuleTest) testToStrMonthly (dateutil.test.test_rrule.RRuleTest) testToStrMonthlyByEaster (dateutil.test.test_rrule.RRuleTest) testToStrMonthlyByEasterNeg (dateutil.test.test_rrule.RRuleTest) testToStrMonthlyByEasterPos (dateutil.test.test_rrule.RRuleTest) testToStrMonthlyByHour (dateutil.test.test_rrule.RRuleTest) testToStrMonthlyByHourAndMinute (dateutil.test.test_rrule.RRuleTest) testToStrMonthlyByHourAndMinuteAndSecond (dateutil.test.test_rrule.RRuleTest) testToStrMonthlyByHourAndSecond (dateutil.test.test_rrule.RRuleTest) testToStrMonthlyByMinute (dateutil.test.test_rrule.RRuleTest) testToStrMonthlyByMinuteAndSecond (dateutil.test.test_rrule.RRuleTest) testToStrMonthlyByMonth (dateutil.test.test_rrule.RRuleTest) testToStrMonthlyByMonthAndMonthDay (dateutil.test.test_rrule.RRuleTest) testToStrMonthlyByMonthAndMonthDayAndWeekDay 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testToStrMonthlyByWeekNoAndWeekDay53 (dateutil.test.test_rrule.RRuleTest) testToStrMonthlyByWeekNoAndWeekDayLarge (dateutil.test.test_rrule.RRuleTest) testToStrMonthlyByWeekNoAndWeekDayLast (dateutil.test.test_rrule.RRuleTest) testToStrMonthlyByYearDay (dateutil.test.test_rrule.RRuleTest) testToStrMonthlyByYearDayNeg (dateutil.test.test_rrule.RRuleTest) testToStrMonthlyInterval (dateutil.test.test_rrule.RRuleTest) testToStrMonthlyIntervalLarge (dateutil.test.test_rrule.RRuleTest) testToStrSecondly (dateutil.test.test_rrule.RRuleTest) testToStrSecondlyByEaster (dateutil.test.test_rrule.RRuleTest) testToStrSecondlyByEasterNeg (dateutil.test.test_rrule.RRuleTest) testToStrSecondlyByEasterPos (dateutil.test.test_rrule.RRuleTest) testToStrSecondlyByHour (dateutil.test.test_rrule.RRuleTest) testToStrSecondlyByHourAndMinute (dateutil.test.test_rrule.RRuleTest) testToStrSecondlyByHourAndMinuteAndSecond (dateutil.test.test_rrule.RRuleTest) testToStrSecondlyByHourAndMinuteAndSecondBug 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testToStrYearlyByMonthAndYearDay (dateutil.test.test_rrule.RRuleTest) testToStrYearlyByMonthAndYearDayNeg (dateutil.test.test_rrule.RRuleTest) testToStrYearlyByMonthDay (dateutil.test.test_rrule.RRuleTest) testToStrYearlyByMonthDayAndWeekDay (dateutil.test.test_rrule.RRuleTest) testToStrYearlyByNWeekDay (dateutil.test.test_rrule.RRuleTest) testToStrYearlyByNWeekDayLarge (dateutil.test.test_rrule.RRuleTest) testToStrYearlyBySecond (dateutil.test.test_rrule.RRuleTest) testToStrYearlyBySetPos (dateutil.test.test_rrule.RRuleTest) testToStrYearlyByWeekDay (dateutil.test.test_rrule.RRuleTest) testToStrYearlyByWeekNo (dateutil.test.test_rrule.RRuleTest) testToStrYearlyByWeekNoAndWeekDay (dateutil.test.test_rrule.RRuleTest) testToStrYearlyByWeekNoAndWeekDay53 (dateutil.test.test_rrule.RRuleTest) testToStrYearlyByWeekNoAndWeekDayLarge (dateutil.test.test_rrule.RRuleTest) testToStrYearlyByWeekNoAndWeekDayLast (dateutil.test.test_rrule.RRuleTest) testToStrYearlyByYearDay 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testWeeklyByWeekNoAndWeekDay53 (dateutil.test.test_rrule.RRuleTest) testWeeklyByWeekNoAndWeekDayLarge (dateutil.test.test_rrule.RRuleTest) testWeeklyByWeekNoAndWeekDayLast (dateutil.test.test_rrule.RRuleTest) testWeeklyByYearDay (dateutil.test.test_rrule.RRuleTest) testWeeklyByYearDayNeg (dateutil.test.test_rrule.RRuleTest) testWeeklyInterval (dateutil.test.test_rrule.RRuleTest) testWeeklyIntervalLarge (dateutil.test.test_rrule.RRuleTest) testWkStIntervalMO (dateutil.test.test_rrule.RRuleTest) testWkStIntervalSU (dateutil.test.test_rrule.RRuleTest) testXAfter (dateutil.test.test_rrule.RRuleTest) testXAfterInc (dateutil.test.test_rrule.RRuleTest) testYearly (dateutil.test.test_rrule.RRuleTest) testYearlyByEaster (dateutil.test.test_rrule.RRuleTest) testYearlyByEasterNeg (dateutil.test.test_rrule.RRuleTest) testYearlyByEasterPos (dateutil.test.test_rrule.RRuleTest) testYearlyByHour (dateutil.test.test_rrule.RRuleTest) testYearlyByHourAndMinute (dateutil.test.test_rrule.RRuleTest) testYearlyByHourAndMinuteAndSecond (dateutil.test.test_rrule.RRuleTest) testYearlyByHourAndSecond (dateutil.test.test_rrule.RRuleTest) testYearlyByMinute (dateutil.test.test_rrule.RRuleTest) testYearlyByMinuteAndSecond (dateutil.test.test_rrule.RRuleTest) testYearlyByMonth (dateutil.test.test_rrule.RRuleTest) testYearlyByMonthAndMonthDay (dateutil.test.test_rrule.RRuleTest) testYearlyByMonthAndMonthDayAndWeekDay (dateutil.test.test_rrule.RRuleTest) testYearlyByMonthAndNWeekDay (dateutil.test.test_rrule.RRuleTest) testYearlyByMonthAndNWeekDayLarge (dateutil.test.test_rrule.RRuleTest) testYearlyByMonthAndWeekDay (dateutil.test.test_rrule.RRuleTest) testYearlyByMonthAndYearDay (dateutil.test.test_rrule.RRuleTest) testYearlyByMonthAndYearDayNeg (dateutil.test.test_rrule.RRuleTest) testYearlyByMonthDay (dateutil.test.test_rrule.RRuleTest) testYearlyByMonthDayAndWeekDay (dateutil.test.test_rrule.RRuleTest) testYearlyByNWeekDay (dateutil.test.test_rrule.RRuleTest) testYearlyByNWeekDayLarge 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testDateWithDot8 (dateutil.test.test_parser.ParserTest) testDateWithDot9 (dateutil.test.test_parser.ParserTest) testDateWithSlash1 (dateutil.test.test_parser.ParserTest) testDateWithSlash10 (dateutil.test.test_parser.ParserTest) testDateWithSlash11 (dateutil.test.test_parser.ParserTest) testDateWithSlash2 (dateutil.test.test_parser.ParserTest) testDateWithSlash3 (dateutil.test.test_parser.ParserTest) testDateWithSlash4 (dateutil.test.test_parser.ParserTest) testDateWithSlash5 (dateutil.test.test_parser.ParserTest) testDateWithSlash6 (dateutil.test.test_parser.ParserTest) testDateWithSlash7 (dateutil.test.test_parser.ParserTest) testDateWithSlash8 (dateutil.test.test_parser.ParserTest) testDateWithSlash9 (dateutil.test.test_parser.ParserTest) testDateWithSpace1 (dateutil.test.test_parser.ParserTest) testDateWithSpace10 (dateutil.test.test_parser.ParserTest) testDateWithSpace11 (dateutil.test.test_parser.ParserTest) testDateWithSpace12 (dateutil.test.test_parser.ParserTest) testDateWithSpace2 (dateutil.test.test_parser.ParserTest) testDateWithSpace3 (dateutil.test.test_parser.ParserTest) testDateWithSpace4 (dateutil.test.test_parser.ParserTest) testDateWithSpace5 (dateutil.test.test_parser.ParserTest) testDateWithSpace6 (dateutil.test.test_parser.ParserTest) testDateWithSpace7 (dateutil.test.test_parser.ParserTest) testDateWithSpace8 (dateutil.test.test_parser.ParserTest) testDateWithSpace9 (dateutil.test.test_parser.ParserTest) testEmptyString (dateutil.test.test_parser.ParserTest) testErrorType01 (dateutil.test.test_parser.ParserTest) testExtraSpace (dateutil.test.test_parser.ParserTest) testFuzzy (dateutil.test.test_parser.ParserTest) testFuzzyAMPMProblem (dateutil.test.test_parser.ParserTest) testFuzzyIgnoreAMPM (dateutil.test.test_parser.ParserTest) testFuzzyWithTokens (dateutil.test.test_parser.ParserTest) testHighPrecisionSeconds (dateutil.test.test_parser.ParserTest) testHourAmPm1 (dateutil.test.test_parser.ParserTest) testHourAmPm10 (dateutil.test.test_parser.ParserTest) testHourAmPm11 (dateutil.test.test_parser.ParserTest) testHourAmPm12 (dateutil.test.test_parser.ParserTest) testHourAmPm2 (dateutil.test.test_parser.ParserTest) testHourAmPm3 (dateutil.test.test_parser.ParserTest) testHourAmPm4 (dateutil.test.test_parser.ParserTest) testHourAmPm5 (dateutil.test.test_parser.ParserTest) testHourAmPm6 (dateutil.test.test_parser.ParserTest) testHourAmPm7 (dateutil.test.test_parser.ParserTest) testHourAmPm8 (dateutil.test.test_parser.ParserTest) testHourAmPm9 (dateutil.test.test_parser.ParserTest) testHourWithLetters (dateutil.test.test_parser.ParserTest) testHourWithLettersStrip1 (dateutil.test.test_parser.ParserTest) testHourWithLettersStrip2 (dateutil.test.test_parser.ParserTest) testHourWithLettersStrip3 (dateutil.test.test_parser.ParserTest) testHourWithLettersStrip4 (dateutil.test.test_parser.ParserTest) testISOFormat (dateutil.test.test_parser.ParserTest) testISOFormatStrip1 (dateutil.test.test_parser.ParserTest) testISOFormatStrip2 (dateutil.test.test_parser.ParserTest) testISOFormatStrip3 (dateutil.test.test_parser.ParserTest) testISOFormatStrip4 (dateutil.test.test_parser.ParserTest) testISOFormatStrip5 (dateutil.test.test_parser.ParserTest) testISOStrippedFormat (dateutil.test.test_parser.ParserTest) testISOStrippedFormatStrip1 (dateutil.test.test_parser.ParserTest) testISOStrippedFormatStrip2 (dateutil.test.test_parser.ParserTest) testISOStrippedFormatStrip3 (dateutil.test.test_parser.ParserTest) testISOStrippedFormatStrip4 (dateutil.test.test_parser.ParserTest) testISOStrippedFormatStrip5 (dateutil.test.test_parser.ParserTest) testIncreasingCTime (dateutil.test.test_parser.ParserTest) testIncreasingISOFormat (dateutil.test.test_parser.ParserTest) testInvalidDay (dateutil.test.test_parser.ParserTest) testLongMonth (dateutil.test.test_parser.ParserTest) testLongWeekday (dateutil.test.test_parser.ParserTest) testMicrosecondPrecisionErrorReturns (dateutil.test.test_parser.ParserTest) testMicrosecondsPrecisionError (dateutil.test.test_parser.ParserTest) testNoSeparator1 (dateutil.test.test_parser.ParserTest) testNoSeparator2 (dateutil.test.test_parser.ParserTest) testParseStr (dateutil.test.test_parser.ParserTest) testParseUnicodeWords (dateutil.test.test_parser.ParserTest) testParseWithNulls (dateutil.test.test_parser.ParserTest) testParserParseStr (dateutil.test.test_parser.ParserTest) testPertain (dateutil.test.test_parser.ParserTest) testPythonLoggerFormat (dateutil.test.test_parser.ParserTest) testRandomFormat1 (dateutil.test.test_parser.ParserTest) testRandomFormat10 (dateutil.test.test_parser.ParserTest) testRandomFormat11 (dateutil.test.test_parser.ParserTest) testRandomFormat12 (dateutil.test.test_parser.ParserTest) testRandomFormat13 (dateutil.test.test_parser.ParserTest) testRandomFormat14 (dateutil.test.test_parser.ParserTest) testRandomFormat15 (dateutil.test.test_parser.ParserTest) testRandomFormat16 (dateutil.test.test_parser.ParserTest) testRandomFormat17 (dateutil.test.test_parser.ParserTest) testRandomFormat18 (dateutil.test.test_parser.ParserTest) testRandomFormat19 (dateutil.test.test_parser.ParserTest) testRandomFormat2 (dateutil.test.test_parser.ParserTest) testRandomFormat20 (dateutil.test.test_parser.ParserTest) testRandomFormat21 (dateutil.test.test_parser.ParserTest) testRandomFormat22 (dateutil.test.test_parser.ParserTest) testRandomFormat23 (dateutil.test.test_parser.ParserTest) testRandomFormat24 (dateutil.test.test_parser.ParserTest) testRandomFormat25 (dateutil.test.test_parser.ParserTest) testRandomFormat26 (dateutil.test.test_parser.ParserTest) testRandomFormat27 (dateutil.test.test_parser.ParserTest) testRandomFormat28 (dateutil.test.test_parser.ParserTest) testRandomFormat29 (dateutil.test.test_parser.ParserTest) testRandomFormat3 (dateutil.test.test_parser.ParserTest) testRandomFormat30 (dateutil.test.test_parser.ParserTest) testRandomFormat31 (dateutil.test.test_parser.ParserTest) testRandomFormat32 (dateutil.test.test_parser.ParserTest) testRandomFormat33 (dateutil.test.test_parser.ParserTest) testRandomFormat34 (dateutil.test.test_parser.ParserTest) testRandomFormat35 (dateutil.test.test_parser.ParserTest) testRandomFormat4 (dateutil.test.test_parser.ParserTest) testRandomFormat5 (dateutil.test.test_parser.ParserTest) testRandomFormat6 (dateutil.test.test_parser.ParserTest) testRandomFormat7 (dateutil.test.test_parser.ParserTest) testRandomFormat8 (dateutil.test.test_parser.ParserTest) testRandomFormat9 (dateutil.test.test_parser.ParserTest) testStrangelyOrderedDate1 (dateutil.test.test_parser.ParserTest) testStrangelyOrderedDate2 (dateutil.test.test_parser.ParserTest) testStrangelyOrderedDate3 (dateutil.test.test_parser.ParserTest) testUnspecifiedDayFallback (dateutil.test.test_parser.ParserTest) testUnspecifiedDayFallbackFebLeapYear (dateutil.test.test_parser.ParserTest) testUnspecifiedDayFallbackFebNoLeapYear (dateutil.test.test_parser.ParserTest) testWeekdayAlone (dateutil.test.test_parser.ParserTest) testZeroYear (dateutil.test.test_parser.ParserTest) test_31_ad (dateutil.test.test_parser.ParserTest) test_99_ad (dateutil.test.test_parser.ParserTest) testBrokenIsDstHandling (dateutil.test.test_tz.TZTest) testFileEnd1 (dateutil.test.test_tz.TZTest) testFileStart1 (dateutil.test.test_tz.TZTest) testGMTHasNoDaylight (dateutil.test.test_tz.TZTest) testGMTOffset (dateutil.test.test_tz.TZTest) testGetTzEquality (dateutil.test.test_tz.TZTest) testGettz (dateutil.test.test_tz.TZTest) testICalEnd1 (dateutil.test.test_tz.TZTest) testICalStart1 (dateutil.test.test_tz.TZTest) testLeapCountDecodesProperly (dateutil.test.test_tz.TZTest) testRangeCmp1 (dateutil.test.test_tz.TZTest) testRangeCmp2 (dateutil.test.test_tz.TZTest) testRoundNonFullMinutes (dateutil.test.test_tz.TZTest) testStrCmp1 (dateutil.test.test_tz.TZTest) testStrCmp2 (dateutil.test.test_tz.TZTest) testStrEnd1 (dateutil.test.test_tz.TZTest) testStrEnd2 (dateutil.test.test_tz.TZTest) testStrEnd3 (dateutil.test.test_tz.TZTest) testStrEnd4 (dateutil.test.test_tz.TZTest) testStrEnd5 (dateutil.test.test_tz.TZTest) testStrEnd6 (dateutil.test.test_tz.TZTest) testStrStart1 (dateutil.test.test_tz.TZTest) testStrStart2 (dateutil.test.test_tz.TZTest) testStrStart3 (dateutil.test.test_tz.TZTest) testStrStart4 (dateutil.test.test_tz.TZTest) testStrStart5 (dateutil.test.test_tz.TZTest) testStrStart6 (dateutil.test.test_tz.TZTest) testStrStr (dateutil.test.test_tz.TZTest) testTZSetDoesntCorrupt (dateutil.test.test_tz.TZTest) testTimeOnlyGettz (dateutil.test.test_tz.TZTest) testTimeOnlyLocal (dateutil.test.test_tz.TZTest) testTimeOnlyOffset (dateutil.test.test_tz.TZTest) testTimeOnlyRange (dateutil.test.test_tz.TZTest) testTimeOnlyUTC (dateutil.test.test_tz.TZTest) testTzNameNone (dateutil.test.test_tz.TZTest) testZoneInfoFileEnd1 (dateutil.test.test_tz.TZTest) testZoneInfoFileStart1 (dateutil.test.test_tz.TZTest) testZoneInfoOffsetSignal (dateutil.test.test_tz.TZTest)
testSetExDateCount (dateutil.test.test_rrule.RRuleSetTest) testSetExRuleCount (dateutil.test.test_rrule.RRuleSetTest) testSetRDateCount (dateutil.test.test_rrule.RRuleSetTest) testSetRRuleCount (dateutil.test.test_rrule.RRuleSetTest)