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+--- Thread: ticktock generator and command (/thread-28224.html)
ticktock generator and command - Skaperen - Jul-10-2020
this code can be imported for the generator or just run to be a command (some people may want to add a #! at the start). the generator simply returns the amount of time it did sleep when it does return. the cycle period is arg 2 and the offset is arg 1. the default is ticktock(0,60) which returns every minute at 0 seconds after the minute.
this generator can be useful to make timed repeating event scripts without accumulating timing errors like using a plain sleep would do.
import time
_mt = dict(s=1,m=60,h=60*60,d=60*60*24,w=60*60*24*7)
def ticktock(offset=0,cycle=60): # default is top of every minute
"""Generator to sleep to each time stop in a time sequence without acculated errors."""
# example: wake up every 5 minutes at 1 minute in: ticktock(60,300)
while True:
n=time.time()
s = (offset-time.time())%cycle
time.sleep(s)
yield s
def _tc(s):
try:
return float(s)
except ValueError:
return float(s[:-1])*_mt[s[-1]]
if __name__ == '__main__':
import sys
g=ticktock(*[_tc(x)for x in sys.argv[1:]])
try:
while True:
next(g)
print('tick',flush=True)
next(g)
print('tock',flush=True)
except KeyboardInterrupt:
exit('')
except Exception:
exit()if you prefer to get it from a URL: http://ipal.net/python-forum/ticktock.py
RE: ticktock generator and command - Skaperen - Jul-10-2020
yes, line 7 was totally useless. it looks to me like leftover from an edit that quietly didn't break anything. i have removed it, now.
ticktock.py:
import time
_mt=dict(s=1,m=60,h=60*60,d=60*60*24,w=60*60*24*7)
def ticktock(offset=0,cycle=60): # default is top of every minute
"""Generator to sleep to each time stop in a time sequence without acculated errors."""
# example: wake up every 5 minutes at 1 minute in: ticktock(60,300)
while True:
s=(offset-time.time())%cycle
time.sleep(s)
yield s
def _tc(s):
try:
return float(s)
except ValueError:
return float(s[:-1])*_mt[s[-1]]
if __name__=='__main__':
import sys
g=ticktock(*[_tc(x)for x in sys.argv[1:]])
try:
while True:
next(g)
print('tick',flush=True)
next(g)
print('tock',flush=True)
except KeyboardInterrupt:
exit('')
except Exception:
exit()this doesn't really need to be a generator. but it's a nice example and a starting point for making other things.