ticktock generator and command

[Skaperen]

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.