kandi X-RAY | python-wait Summary
kandi X-RAY | python-wait Summary
python-wait
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python-wait Key Features
python-wait Examples and Code Snippets
Community Discussions
Trending Discussions on python-wait
QUESTION
My application updates an e-paper screen with various "plugin" objects. Each object represents one module with its own worker that creates the image. The image is displayed for a time, then switched to the next in the queue. Each object has its own timer that depends on data that its associated worker produces. This timer can change in response to various external inputs (e.g. user starts music playing, weather alert occurs).
The workers are queued and updated in one go, then the updates are made to the screen when needed.
I currently use sleep(1) at the end of the update/display loop to avoid busy waiting while nothing is happening. Is there a better strategy to improve the resources consumed by this? Experimentally, I've discovered that by increasing the sleep() value the CPU load of this process drops down a bit (as monitored with top).
Question: Is there a more resource efficient way to set up the display loop (see below)?
I've read up on threading and using join, but those don't seem appropriate here because the wait period is known and the code isn't waiting for some external resource to become available. It's simply waiting for a timer to expire.
Here's a sample of the display loop:
...ANSWER
Answered 2020-Oct-25 at 13:07add a method like timer_expires() that returns the timestamp for when the timer expires to each of the plugins, then it could sleep until it expires so that it dosn't have to keep checking
QUESTION
I am usually using concurrent.futures.ThreadPoolExecutor for executing tasks concurrently in python.
There is a function that is very lengthy and non-deterministic in terms of the time it takes to be executed (it gets a proxy, send an HTTP request, etc.).
I want to call it few times (let's say 2), and here is when it gets complicated for me:
When one of the tasks finishes, I would like to check its return value and if it's True, carry on with the code-path and i don't care anymore about the second task and there is no need to wait for it anymore.
But if the return value is False, I would like to wait for the second task to finish and then continue with the code-path.
I tried to look in several places here in SO, like this python concurrency question but still couldn't understand how to do it precisely.
...ANSWER
Answered 2018-Feb-05 at 19:50You can either use concurrent.futures.wait with the return_when=FIRST_COMPLETED option (which will wait on multiple futures, but return as soon as any of them complete). But even simpler is to use concurrent.futures.as_completed, which gives you an iterator that returns the futures as they complete or are cancelled.
QUESTION
I'm trying to call a stored procedure in my MSSQL database from a python script, but it does not run completely when called via python. This procedure consolidates transaction data into hour/daily blocks in a single table which is later grabbed by the python script. If I run the procedure in SQL studio, it completes just fine.
When I run it via my script, it gets cut short about 2/3's of the way through. Currently I found a work around, by making the program sleep for 10 seconds before moving on to the next SQL statement, however this is not time efficient and unreliable as some procedures may not finish in that time. I'm looking for a more elegant way to implement this.
Current Code:
...ANSWER
Answered 2017-Nov-14 at 14:50As OP found out, inconsistent or imcomplete processing of stored procedures from application layer like Python may be due to straying from best practices of TSQL scripting.
As @AaronBetrand highlights in this Stored Procedures Best Practices Checklist blog, consider the following among other items:
- Explicitly and liberally use
BEGIN ... ENDblocks; - Use
SET NOCOUNT ONto avoid messages sent to client for every row affected action, possibly interrupting workflow; - Use semicolons for statement terminators.
Example
QUESTION
In the following program, which I am running on Windows 7 professional 64, I am trying to allow the user to intervene if needed (through the inner while loop) and cause the outer while loop to repeat an action. Otherwise, the inner while loop would timeout and the program would just continue unimpeded:
ANSWER
Answered 2017-Jan-25 at 20:46You are comparing variable decision and string "repeat" in your inner loop since you are using == operator. You should use = instead to assign a value to the variable:
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Install python-wait
You can use python-wait like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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