mirror of
https://github.com/Brandon-Rozek/website.git
synced 2024-11-14 04:37:28 -05:00
39 lines
1.1 KiB
Markdown
39 lines
1.1 KiB
Markdown
---
|
|
title: "Python: Set Interval"
|
|
date: 2020-02-25T21:34:03-05:00
|
|
draft: false
|
|
tags: [ "Python" ]
|
|
---
|
|
|
|
Javascript has a function called `setInterval` which given a length of time $T$ and a callback function, it will perform that function every $T$ milliseconds. For example, to print "Hello, World!" every 5 seconds:
|
|
|
|
```javascript
|
|
setInterval(function() {
|
|
console.log("Hello, World!")
|
|
}, 5 * 1000)
|
|
```
|
|
|
|
Wouldn't it be nice if Python had a similar functionality? Well thanks to [right2clicky](https://stackoverflow.com/a/48741004), there's a nice and quick way to implement one.
|
|
|
|
```python
|
|
from threading import Timer
|
|
|
|
class Repeat(Timer):
|
|
def run(self):
|
|
while not self.finished.wait(self.interval):
|
|
self.function(*self.args, **self.kwargs)
|
|
```
|
|
|
|
Since `self.finished.wait` only returns `True` when the Event `self.finished` is set to true, the thread will keep waiting and calling the function for the set interval time period.
|
|
|
|
The same post has a usage example:
|
|
|
|
```python
|
|
from time import sleep
|
|
|
|
t = Repeat(1.0, lambda: print("Hello, World!"))
|
|
t.start()
|
|
sleep(5)
|
|
t.cancel()
|
|
```
|
|
|