using interval in python

[reverse]

Hi all
How are you doing?
My first post here and please pardon for my language...hope you dont mind?
I am into Actionscripting but slowly learning python and it`s fun!

my first question.

How to call a function using timer/interval in python?

I need to call a function over and over again using timer inbetween.

for example in actionscripting:

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var intervalId:Number;
var count:Number = 0;
var maxCount:Number = 10;
var duration:Number = 2000;

function executeCallback():Void {
 trace("executeCallback intervalId: " + intervalId + " count: " + count);
 if(count >= maxCount) {
 clearInterval(intervalId);
 } 
 count++;
}

intervalId = setInterval(this, "executeCallback", duration);

or simply call a function with time gap for infinty of time?
regards
reverse

[BlackJack]

If you want the function to be called asynchronous the you need a thread:

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from time import sleep
from threading import Thread

class Counter(Thread):
    def __init__(self, duration, max_count):
        Thread.__init__(self)
        self.duration = duration
        self.max_count = max_count
    
    def run(self):
        for count in xrange(self.max_count):
            print 'counter %s: %d' % (self.getName(), count)
            sleep(self.duration)


def main():
    counter = Counter(0.2, 10)
    counter.start()

If you just want to call a function in the main thread over and over again it's just:

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    while True:
        print 'do something'
        sleep(0.2)

[reverse]

Hi BlackJack
Thanks for the reply!
I am quite newbie to use class function in python, therefore I tried this simple eject cdrom in and out but didn`t work.

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from time import sleep
import WinCDRom
summe = 0
while summe < 50:
    print "repeat"
    cd = WinCDRom.Cdrom()
    cd.eject()
    cd.close()
    cd.load()
    sleep(0.2)

things which are not clear to me:
1/ sleep(0.2)....does it mean pause for 0.2 milli sec and repeat over?
what I missing here is something..like updateAfterEvent.

best regards
reverse

[Leonidas]

I tried this simple eject cdrom in and out but didn`t work.

Thats because you forgot to increment `summe` in your `while`-Loop

sleep(0.2)....does it mean pause for 0.2 milli sec and repeat over?

This means pause for 0.2 seconds, that's 200 milliseconds, but yes, it repeats every 1/5 second (provided that eject() close() and load() return immediately).

[reverse]

Thats because you forgot to increment `summe` in your `while`-Loop

where do I insert the increment??

example 1

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from time import sleep
import WinCDRom
summe = 0
while summe++ < 50:
    print "repeat"
    cd = WinCDRom.Cdrom()
    cd.eject()
    cd.close()
    cd.load()
    sleep(0.2)

a simple example from AS

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var i:Number = 0; 
while (i++ < 5) { 
    trace("this is execution " + i); 
}

I am not quite familiar with python operators but when I compare the both code AS is seems to me right now more logical.

am I missing something?
thanks and regards
reverse

[Leonidas]

Try this:

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import time
import WinCDRom
summe = 0
while summe < 50:
    print "repeat"
    cd = WinCDRom.Cdrom()
    cd.eject()
    cd.close()
    cd.load()
    summe += 1
    time.sleep(0.2)

Edit: Corrected namespace issue.

[reverse]

get following error

Traceback (most recent call last):
File "loopOvertime3.py", line 2, in ?
import WinCDRom
ImportError: No module named WinCDRom

but following code works

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import WinCDRom
cd = WinCDRom.Cdrom()
cd.eject()
cd.close()
cd.load()

[sape]

Make this:

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import time
import WinCDRom
summe = 0
cd = WinCDRom.Cdrom()
while summe < 50:
    print "repeat"
    cd.eject()
    cd.close()
    cd.load()
    summe += 1
    sleep(0.2)

that should be able be done (not tested).

Sry, for my bad english :/

lg

[Leonidas]

get following error

That's impossible: I guess you are starting both codes from different directories an in one of there your WinCDRom module cannot be found. You have to start both scripts from the same directory.

[reverse]

Hi all
thanks for yours reply!

I am still unable to solve the cd.eject and close

Leonidas (I am not sure, what you mean by running codes from different directories??)

I am using scite to edit...and importing both module


at least the below part works.

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from time import sleep
import winsound
#import WinCDRom
summe = 0
#cd = WinCDRom.Cdrom()
while summe < 5:
    print "repeat"
    # Play Windows exit sound.methods (SystemQuestion), (SystemExclamation), (SystemExit), (SystemHand), (SystemQuestion)
    winsound.PlaySound("SystemExclamation", winsound.SND_ALIAS)
    # cd.eject()
    # cd.close()
    # cd.load()
    summe += 1
    sleep(1.2)

thanks
reverse

[Leonidas]

Leonidas (I am not sure, what you mean by running codes from different directories??)

Where is this WInCDRom module from? It is not an integral part of the Python distribution from python.org.

[reverse]

from following tutorial
http://aspn.activestate.com/ASPN/Cookbo ... ipe/180919

it says:
Using the Python Win32 Extensions, the module automatically detects all cd drives and defaults to the first drive found or to a programmer specified drive.

[Python 47]

Hi Reverse:

Copy the Sourcecode from the page to scite and save it to:

C:\Python2x\Lib\WinCDRom.py

Then you save this sourcecode to C:\Python2x\cd.py

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import time
import WinCDRom
summe = 0
while summe < 50:
    print "repeat"
    cd = WinCDRom.Cdrom()
    cd.eject()
    cd.close()
    cd.load()
    summe += 1
    time.sleep(0.2)

Then you start the Python Interpreter and type:

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import cd