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timer3 - Scheduler for Python functions.

Project description

Version: 0.1.0

Introduction

The timer3 module lets you schedule Python functions at specific times, or at an interval. It can be used as a replacement to threading.Timer, the difference is that timer3 is always only using a single thread (unless you manually start more of them)

You should never use this to apply expensive operations, as this would not be effective when running in a single thread, rather you should make the timer move the operations to a execution pool (like a thread/multiprocessing pool, or maybe sending a message):

>>> pool = multiprocessing.Pool()
>>> timer3.apply_after(10000, pool.apply_async, (expensive_fun, ))

Installation

You can install timer3 either via the Python Package Index (PyPI) or from source.

To install using pip,:

$ pip install timer3

Examples

Apply function after n msecs:

>>> import timer3
>>> timer3.apply_after(msecs, fun, args, kwargs, priority=0)

Apply function every n msecs:

>>> timer3.apply_interval(msecs, fun, args, kwargs, priority=0)

Apply function at a specific date (a datetime object):

>>> timer3.apply_at(datetime, fun, args, kwargs, priority=0)

Cancelling timers

The apply_* functions returns a timer3.Entry instance, you can use this to cancel the execution:

>>> tref = timer3.apply_after(msecs, fun, args, kwargs)
>>> tref.cancel()

Running custom Timer threads

When using the module interface a default timer thread is started as soon as you schedule something. If you want to keep track of the thread manually, you can use the timer3.Timer class:

>>> timer = timer3.Timer()
>>> timer.apply_after(msecs, fun, args, kwargs)
>>> timer.stop() # stops the thread and joins it.

License

This software is licensed under the New BSD License. See the LICENSE file in the top distribution directory for the full license text.

Project details


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