Fix 13245:

sched.scheduler class constructor's timefunc and delayfunct parameters are now optional.
scheduler.enter and scheduler.enterabs methods gained a new kwargs parameter.

Patch contributed by Matt Mulsow.

Doc/library/sched.rst

@@ -14,7 +14,7 @@
 The :mod:`sched` module defines a class which implements a general purpose event
 scheduler:
 
-.. class:: scheduler(timefunc, delayfunc)
+.. class:: scheduler(timefunc=time.time, delayfunc=time.sleep)
 
    The :class:`scheduler` class defines a generic interface to scheduling events.
    It needs two functions to actually deal with the "outside world" --- *timefunc*
@@ -25,6 +25,9 @@ scheduler:
    event is run to allow other threads an opportunity to run in multi-threaded
    applications.
 
+   .. versionchanged:: 3.3
+      *timefunc* and *delayfunc* parameters are optional.
+
 Example::
 
    >>> import sched, time
@@ -79,26 +82,38 @@ Scheduler Objects
 :class:`scheduler` instances have the following methods and attributes:
 
 
-.. method:: scheduler.enterabs(time, priority, action, argument)
+.. method:: scheduler.enterabs(time, priority, action, argument=[], kwargs={})
 
    Schedule a new event. The *time* argument should be a numeric type compatible
    with the return value of the *timefunc* function passed  to the constructor.
    Events scheduled for the same *time* will be executed in the order of their
    *priority*.
 
-   Executing the event means executing ``action(*argument)``.  *argument* must be a
-   sequence holding the parameters for *action*.
+   Executing the event means executing ``action(*argument, **kwargs)``.
+   *argument* must be a sequence holding the parameters for *action*.
+   *kwargs* must be a dictionary holding the keyword parameters for *action*.
 
    Return value is an event which may be used for later cancellation of the event
    (see :meth:`cancel`).
 
+   .. versionchanged:: 3.3
+      *argument* parameter is optional.
 
-.. method:: scheduler.enter(delay, priority, action, argument)
+   .. versionadded:: 3.3
+      *kwargs* parameter was added.
+
+
+.. method:: scheduler.enter(delay, priority, action, argument=[], kwargs={})
 
    Schedule an event for *delay* more time units. Other than the relative time, the
    other arguments, the effect and the return value are the same as those for
    :meth:`enterabs`.
 
+   .. versionchanged:: 3.3
+      *argument* parameter is optional.
+
+   .. versionadded:: 3.3
+      *kwargs* parameter was added.
 
 .. method:: scheduler.cancel(event)
 

Doc/whatsnew/3.3.rst

@@ -572,6 +572,22 @@ should be used.  For example, this will send a ``'HEAD'`` request::
 
 (:issue:`1673007`)
 
+sched
+-----
+
+* *timefunc* and *delayfunct* parameters of :class:`~sched.scheduler` class
+  constructor are now optional and defaults to :func:`time.time` and
+  :func:`time.sleep` respectively.  (Contributed by Matt Mulsow in
+  :issue:`8809`)
+
+* :meth:`~sched.scheduler.enter` and :meth:`~sched.scheduler.enterabs`
+  *argument* parameter is now optional.  (Contributed by Matt Mulsow in
+  :issue:`8809`)
+
+* :meth:`~sched.scheduler.enter` and :meth:`~sched.scheduler.enterabs`
+  now accept a *kwargs* parameter.  (Contributed by Matt Mulsow in
+  :issue:`8809`)
+
 Optimizations
 =============
 
@@ -744,4 +760,3 @@ Other issues
 .. Issue #10998: the -Q command-line flag and related artifacts have been
    removed.  Code checking sys.flags.division_warning will need updating.
    Contributed by Éric Araujo.
-

Lib/sched.py

@@ -28,12 +28,13 @@ has another way to reference private data (besides global variables).
 # XXX instead of having to define a module or class just to hold
 # XXX the global state of your particular time and delay functions.
 
+import time
 import heapq
 from collections import namedtuple
 
 __all__ = ["scheduler"]
 
-class Event(namedtuple('Event', 'time, priority, action, argument')):
+class Event(namedtuple('Event', 'time, priority, action, argument, kwargs')):
     def __eq__(s, o): return (s.time, s.priority) == (o.time, o.priority)
     def __ne__(s, o): return (s.time, s.priority) != (o.time, o.priority)
     def __lt__(s, o): return (s.time, s.priority) <  (o.time, o.priority)
@@ -42,32 +43,33 @@ class Event(namedtuple('Event', 'time, priority, action, argument')):
     def __ge__(s, o): return (s.time, s.priority) >= (o.time, o.priority)
 
 class scheduler:
-    def __init__(self, timefunc, delayfunc):
+
+    def __init__(self, timefunc=time.time, delayfunc=time.sleep):
         """Initialize a new instance, passing the time and delay
         functions"""
         self._queue = []
         self.timefunc = timefunc
         self.delayfunc = delayfunc
 
-    def enterabs(self, time, priority, action, argument):
+    def enterabs(self, time, priority, action, argument=[], kwargs={}):
         """Enter a new event in the queue at an absolute time.
 
         Returns an ID for the event which can be used to remove it,
         if necessary.
 
         """
-        event = Event(time, priority, action, argument)
+        event = Event(time, priority, action, argument, kwargs)
         heapq.heappush(self._queue, event)
         return event # The ID
 
-    def enter(self, delay, priority, action, argument):
+    def enter(self, delay, priority, action, argument=[], kwargs={}):
         """A variant that specifies the time as a relative time.
 
         This is actually the more commonly used interface.
 
         """
         time = self.timefunc() + delay
-        return self.enterabs(time, priority, action, argument)
+        return self.enterabs(time, priority, action, argument, kwargs)
 
     def cancel(self, event):
         """Remove an event from the queue.
@@ -111,7 +113,7 @@ class scheduler:
         timefunc = self.timefunc
         pop = heapq.heappop
         while q:
-            time, priority, action, argument = checked_event = q[0]
+            time, priority, action, argument, kwargs = checked_event = q[0]
             now = timefunc()
             if now < time:
                 delayfunc(time - now)
@@ -120,7 +122,7 @@ class scheduler:
                 # Verify that the event was not removed or altered
                 # by another thread after we last looked at q[0].
                 if event is checked_event:
-                    action(*argument)
+                    action(*argument, **kwargs)
                     delayfunc(0)   # Let other threads run
                 else:
                     heapq.heappush(q, event)

Lib/test/test_sched.py

@@ -72,6 +72,18 @@ class TestCase(unittest.TestCase):
         scheduler.run()
         self.assertEqual(scheduler._queue, [])
 
+    def test_args_kwargs(self):
+        flag = []
+
+        def fun(*a, **b):
+            flag.append(None)
+            self.assertEqual(a, (1,2,3))
+            self.assertEqual(b, {"foo":1})
+
+        scheduler = sched.scheduler(time.time, time.sleep)
+        z = scheduler.enterabs(0.01, 1, fun, argument=(1,2,3), kwargs={"foo":1})
+        scheduler.run()
+        self.assertEqual(flag, [None])
 
 def test_main():
     support.run_unittest(TestCase)

Misc/ACKS

@@ -11,6 +11,7 @@ Without you, I would've stopped working on Python long ago!
 PS: In the standard Python distribution, this file is encoded in UTF-8
 and the list is in rough alphabetical order by last names.
 
+Matt Mulsow
 Rajiv Abraham
 David Abrahams
 Ron Adam

Misc/NEWS

@@ -387,6 +387,11 @@ Core and Builtins
 Library
 -------
 
+- Issue #13245: sched.scheduler class constructor's timefunc and
+  delayfunct parameters are now optional.
+  scheduler.enter and scheduler.enterabs methods gained a new kwargs parameter.
+  Patch contributed by Matt Mulsow.
+
 - Issue #12328: Under Windows, refactor handling of Ctrl-C events and
   make _multiprocessing.win32.WaitForMultipleObjects interruptible when
   the wait_flag parameter is false.  Patch by sbt.