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40 lines
1.1 KiB
Markdown
40 lines
1.1 KiB
Markdown
---
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title: "Python: Set Interval"
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date: 2020-02-25T21:34:03-05:00
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draft: false
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tags: [ "Python" ]
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medium_enabled: true
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---
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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:
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```javascript
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setInterval(function() {
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console.log("Hello, World!")
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}, 5 * 1000)
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```
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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.
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```python
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from threading import Timer
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class Repeat(Timer):
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def run(self):
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while not self.finished.wait(self.interval):
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self.function(*self.args, **self.kwargs)
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```
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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.
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The same post has a usage example:
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```python
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from time import sleep
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t = Repeat(1.0, lambda: print("Hello, World!"))
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t.start()
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sleep(5)
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t.cancel()
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```
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