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Date: Mon, 12 Jan 2015 15:23:48 +0530
Subject: Re: Few Coding suggestions - resending
From: Ganesh Pal <ganesh1pal@gmail.com>
To: Dave Angel <davea@davea.name>
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On Mon, Jan 12, 2015 at 8:42 AM, Ganesh Pal <ganesh1pal@gmail.com> wrote:
> On Sun, Jan 11, 2015 at 7:57 PM, Dave Angel <davea@davea.name> wrote:
>>>
>>>
>> No idea how that represents "a difference of 5 minutes".  So I'll take a=
 totally wild guess that you meant:
>>
>> Sunday 23:50 23:55
>> Monday 00:00 00:05
>> Monday 00:10 00:15
>> Monday 00:20 00:25
>> Monday 00:30 00:35
>>
>> which would have the 2nd column 5 minutes after the first.
>>
>> You need another datetime object, let's call it 'end'
>>
>> end =3D start + timedelta(minutes=3D5)
>>
>> and now you want to yield three things, in a tuple:
>>
>> yield (start.strftime("%A"), start.strftime("%H:%M"),
>>    end.strftime("%H:%M"))
>>
>> Of course that's a pain to do twice, as you have two yields in that func=
tion.  I'll leave you to reorder the loop to make that unnecessary.  Hint, =
do the yield first, THEN increment the start variable.
>
> Thanks for the inputs , I tried doing the increments and decrements
> first and then Yield
>
>  Program:
>
>   Login-1@SNAP-BOX-1 new]$ cat time_range_01.py
> #!/usr/bin/python
> import time
> from datetime import date, time, datetime, timedelta
> #h =3D datetime.strftime("%H")
> #m =3D datetime.strftime("%M")
> h=3D23
> m=3D50
> d =3D date.today()
> print d
>
> def yield_times():
>     global  h,m,d
>     start =3D datetime.combine(d, time(int(h),int(m)))
>     end =3D datetime.combine(d, time(int(h),int(m)))
>     while True:
>         start +=3D timedelta(minutes=3D10)
>         end =3D start + timedelta(minutes=3D5)
>         yield(start.strftime("%A"),start.strftime("%H:%M"),end.strftime("=
%H:%M"))
> gen =3D yield_times()
> for i in range(10):
>     print gen.next()
>
> output :
> [Login-1@SNAP-BOX-1 new]$ python time_range_01.py
> 2015-01-12
> ('Tuesday', '00:00', '00:05')
> ('Tuesday', '00:10', '00:15')
> ('Tuesday', '00:20', '00:25')
> ('Tuesday', '00:30', '00:35')
> ('Tuesday', '00:40', '00:45')
> ('Tuesday', '00:50', '00:55')
> ('Tuesday', '01:00', '01:05')
> ('Tuesday', '01:10', '01:15')
> ('Tuesday', '01:20', '01:25')
> ('Tuesday', '01:30', '01:35')
>
> PS :   Except formatting the results looks pretty much what i was
> expecting .I was pretty much happy to see this last night :) .
>
>
>> and in the other loop, you want
>>     res =3D "{} {} {}\n".format(gen.next)
>>     print res,
>>
>>>
>
> Thanks ,  I will have to modify for the new output
>
>>> (b)  how to copy the above output (i.e with the new column to a file.)
>>>
>>
>> Instead of printing, just do f.write(res).  Or do both. Notice that to m=
ake this easy, i avoided doing any formatting in the print statement. I use=
d a trailing comma on it to avoid print adding a newline, and instead put i=
t explicitly in the format method call.
>>
>>>
>
> Sure
>
>>> (c)  The  final output should be a file , having the entries  day ,
>>> start , end time of the remote file. how do  i pass the  this to
>>> yeild-times()
>>>
>>> import time
>>>
>>> /* Assuming I retrive the below values h,m,d from the remote machine*/
>>>
>>> h =3D time.strftime("%H")
>>> m =3D time.strftime("%M")
>>> d =3D date.today()
>>>
>>
>> Those first two are strings, but the third is a datetime object.  That l=
ast can be painful to pass between machines.
>
> Correct , also looks like I have another issue , if I happen to pass
> the first two strings
>
> #  instead hard coded value i.e h =3D 23 and y =3D50 , i try using the
> string directly I end up getting the below error :
>
> h =3D datetime.strftime("%H")
> m =3D datetime.strftime("%M")
>
> [Login-1@SNAP-BOX-1 new]$ python  time_range_01.py
> Traceback (most recent call last):
>   File "time_range_01.py", line 4, in <module>
>     h =3D datetime.strftime("%H")
> TypeError: descriptor 'strftime' requires a 'datetime.date' object but
> received a 'str'
>
> The date time object is retrieved once once from the remote machine
> and just for building the file in the required format.
> Do you foresee any problems using this ?
>
>>
>>>
>>> def yield_times():
>>>        global h,m,d
>>
>>
>> No idea what that's all about.  If you want to pass arguments to yield_t=
imes(), put them inside the parens.
>>
> sure .
>
> Regards,
> Gpal