python time

[MRAB]

On 21/03/2011 03:29, ecu_jon wrote:
> On Mar 20, 10:48 pm, ecu_jon<hayesjd... at yahoo.com>  wrote:
>> On Mar 20, 10:09 pm, Dave Angel<da... at ieee.org>  wrote:
>>
>>
>>
>>> On 01/-10/-28163 02:59 PM, ecu_jon wrote:
>>
>>>> I'm working on a script that will run all the time. at time specified
>>>> in a config file, will kick-off a backup.
>>>> problem is, its not actually starting the job. the double while loop
>>>> runs, the first comparing date works. the second for hour/min does
>>>> not.
>>
>>>> #python file
>>>> import os,string,,time,getpass,ConfigParser
>>>> from datetime import *
>>>> from os.path import join, getsize
>>>> from time import strftime,localtime
>>
>>>> config = ConfigParser.ConfigParser()
>>>> config.read("config.ini")
>>>> source = config.get("myvars", "source")
>>>> destination = config.get("myvars", "destination")
>>>> date = config.get("myvars", "date")
>>>> time = config.get("myvars", "time")
>>>> str_time=strftime("%H:%M",localtime())
>>
>>>> while datetime.now().weekday() == int(date):
>>>>       while str_time == time:
>>>>           print "do it"
>>
>>> You're comparing two objects in that inner while-loop, but since they
>>> never change, they'll never match unless they happen to start out as
>>> matched.
>>
>>> you need to re-evaluate str_time each time through the loop.  Make a
>>> copy of that statement and put it inside the loop.
>>
>>> You probably don't want those loops to be comparing to ==, though, since
>>> if you start this script on some other day, it'll never loop at all.
>>> Also, it'd be good to do some form of sleep() function when you're
>>> waiting, so you don't bog the system down with a busy-loop.
>>
>>> DaveA
>>
>> i guess im just having a hard time creating something like
>> check if go condition,
>> else sleep
>>
>> the double while loops take 12% cpu usage on my machine so this is
>> probably unacceptable.
>> also the sleep command does not like me :
>>   >>>  from datetime import *
>>
>>>>> from time import strftime,localtime,sleep
>>>>> time.sleep(3)
>>
>> Traceback (most recent call last):
>>    File "<pyshell#2>", line 1, in<module>
>>      time.sleep(3)
>> AttributeError: type object 'datetime.time' has no attribute 'sleep'
>>
>>
>>
>> here it is updated with the hour/min check fixed.
>> #updated python code
>> import os,string,time,getpass,md5,ConfigParser
>> from datetime import *
>> from os.path import join, getsize
>> from time import strftime,localtime,sleep
>>
>> config = ConfigParser.ConfigParser()
>> config.read("config.ini")
>> date = config.get("myvars", "date")
>> time = config.get("myvars", "time")
>>
>> while datetime.now().weekday() == int(date):
>>      str_time=strftime("%H:%M",localtime())
>>      while str_time == time:
>>          print "do it"
>
> i think this is what you are talking about
> except that the time.sleep just does not work.
> even changing "from time import strftime,localtime" to "from time
> import strftime,localtime,sleep" does not do it.
> #python code
> import os,string,time,getpass,md5,ConfigParser

At this point, "time" refers to the time module which you have just
imported.

> from datetime import *

At this point, "time" refers to the class "time" which you have just
imported from the datetime module.

> from os.path import join, getsize
> from time import strftime,localtime
>
> config = ConfigParser.ConfigParser()
> config.read("config.ini")
> date = config.get("myvars", "date")
> time = config.get("myvars", "time")

At this point, "time" refers to the value you got from the config.
>
> a=1
> while a>0:
>      if datetime.now().weekday() == int(date):
>          str_time=strftime("%H:%M",localtime())

At this point, "time" still refers to the value you got from the config.

>          if str_time == time:
>              print "do it"

At this point, "time" still refers to the value you got from the config.
It does not have an attribute called "sleep".

>      time.sleep(58)
>