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There are some ubiquitous patterns that are elegant and simple. There are others that are not.
from time import time, sleep
max_sleep_time_sec = 1.5
start_time = time()
timeout_sec = 42.0
while time() - start_time < timeout_sec:
# Do or check some stuff
time_remaining = timeout_sec - (time() - start_time)
if time_remaining > max_slep_time_sec:
sleep(min(time_remaining, max_sleep_time_sec))
else:
sleep(max_sleep_time_sec)
What is the purpose of this loop? Oh, I see, it's a timeout. Is the order of
operations correct in my loop condition? Have I correctly calculated
time_remaining
? Is my if
clause correct? Hint: It's not. Does this code
behave properly if the system clock is updated after I set start_time
? Hint:
It doesn't. How many times is this code duplicated within my application?
We can do better. EggTimer can help.
from time import sleep
from eggtimer import EggTimer
max_sleep_time_sec = 1.5
timer = EggTimer()
timer.set(42.0)
while not timer.is_expired():
# Do or check some stuff
sleep(min(timer.time_remaining_sec, max_sleep_time_sec))
Ah, that's better! Clear, concise, reusable, and expressive. The risk of defects is significantly lower, too!
Install with pip install -U egg-timer
EggTimer
- A class for checking whether or not a certain amount of time has
elapsed.
ThreadSafeEggTimer
- A thread-safe implementation of EggTimer
.
See EggTimer Example for an example of how to use
EggTime
. ThreadSafeEggTimer
shares the same interface.
Python 3.10.4 (main, Jun 29 2022, 12:14:53) [GCC 11.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from eggtimer import EggTimer
>>> help(EggTimer)
Help on class EggTimer in module eggtimer.eggtimer:
class EggTimer(builtins.object)
| A class for checking whether or not a certain amount of time has elapsed.
|
| Methods defined here:
|
| __init__(self)
| Initialize self. See help(type(self)) for accurate signature.
|
| is_expired(self)
| Check whether or not the timer has expired
|
| :return: True if the elapsed time since set(TIMEOUT_SEC) was called is greater than
| TIMEOUT_SEC, False otherwise
|
| reset(self)
| Reset the timer without changing the timeout
|
| set(self, timeout_sec: float)
| Set a timer
|
| :param timeout_sec: A non-negative floating point number expressing the number of
| seconds to set the timeout for.
|
| ----------------------------------------------------------------------
| Readonly properties defined here:
|
| time_remaining_sec
| Return the amount of time remaining until the timer expires.
|
| :return: The number of seconds until the timer expires. If the timer is expired, this
| function returns 0 (it will never return a negative number).
|
| ----------------------------------------------------------------------
| Data descriptors defined here:
|
| __dict__
| dictionary for instance variables (if defined)
|
| __weakref__
| list of weak references to the object (if defined)
>>>
Running the tests is as simple as poetry install && poetry run pytest
EggTimer is open-source software licensed under the GNU General Public License v3.0.
FAQs
A simpler way to handle timeouts in Python
We found that egg-timer demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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