bibi midi wrote:
#!/usr/bin/env python
# -*- coding: utf-8 -*-
'''
Calculate internet data consumption
of service provider
Code as per help of python tutor mailing list
Created: 26-Oct-2009
'''
intro = raw_input('press enter to view your internet data consumption: ')
log_file = '/home/bboymen/mobily.data.plan'
total_consumed = 0
for line in open(log_file):
total_consumed += int(line.split(' ')[9])
total_consumed = total_consumed/1000000.0
print "total data consumed is: %0.3f MB\n" % total_consumed
#TODO:
#1) show the list comprehension alternative method
#2) add exception handling e.g. when log_file cant be found or when key
interrupt is pressed
# or when index[9] is not a number, etc
#3) print latest date of calculated data
I'm working on TODO no. 3 e.g. I want to show the latest date when
wvdial generated the ppp data. This is normally the date of last line
of the ppd:
Oct 14 11:03:45 cc000002695 pppd[3092]: Sent 3489538 bytes, received
43317854 bytes.
^^^^^^^^^
For the exception handling i *think* i just use the general exception
method e.g. will catch all kinds of error. I really dont know what
other errors will show up aside from the ones i listed in the TODO.
Advise is appreciated.
On Mon, Oct 26, 2009 at 2:12 PM, Luke Paireepinart
<rabidpoob...@gmail.com <mailto:rabidpoob...@gmail.com>> wrote:
On Mon, Oct 26, 2009 at 3:20 AM, Christian Witts
<cwi...@compuscan.co.za <mailto:cwi...@compuscan.co.za>> wrote:
fInput = open('/path/to/log.file', 'rb')
total_usage = 0
for line in fInput:
total_usage += int(line.split(' ')[9].strip())
print total_usage
It's actually bad to assign a variable to the file object in this
case (flinput = ....) because Python will automatically close a
file after you're done with it if you iterate over it directly,
but if you include a reference it will stay open until the python
program ends or you explicitly call flinput.close(). It doesn't
matter much in this example but in general it is good practice to
either
1) call foo.close() immediately after you're done using a file
object, or
2) don't alias the file object and just over it directly so Python
will auto-close it.
Therefore a better (and simpler) way to do the above would be:
total_usage = 0
for line in open('/path/to/log.file'):
total_usage += int(line.split(' ')[9])
Also note you don't need to strip the input because int() coersion
ignores whitespace anyway. And additionally you shouldn't be
opening this in binary mode unless you're sure you want to, and
I'm guessing the log file is ascii so there's no need for the
'rb'. (reading is default so we don't specify an 'r'.)
And since I like list comprehensions a lot, I'd probably do it
like this instead:
total_usage = sum([int(line.split(' ')[9]) for line in
open('/path/to/log.file')])
Which incidentally is even shorter, but may be less readable if
you don't use list comprehensions often.
Also, the list comprehension version is likely to be more
efficient, both because of the use of sum rather than repeated
addition (sum is implemented in C) and because list comprehensions
in general are a tad faster than explicit iteration, if i recall
correctly (don't hold me to that though, I may be wrong.)
Of course this has no error checking and or niceties, but I
will leave that up to you.
The same applies to my modifications.
Good luck, and let us know if you need anything else!
-Luke
--
Best Regards,
bibimidi
Exceptions:
* Not finding the log file would be IOError.
* Casting an alphanumeric or alpha string to integer would be a
ValueError, in this context you won't have a None so you shouldn't need
to worry about a TypeError
* Selecting the 10th element in your list can raise an IndexError if
your line did not contain enough delimiters to create a large enough list.
Pedantic:
1MB = 1,024KB = 1,024*1,024B
So your total consumed should be div (1024*1024.0) or div 1048576.0
For the date you can look at the time module to get a nice string
representation of the date/time. Or as you said you want the last date
listed in the log file then you could add something like
for line in open(log_file):
last_log_date = ' '.join(line.split(' ')[:3]
which would take the first 3 elements in your list and combine them
again. Of course this is again just a simple representation of what to do.
--
Kind Regards,
Christian Witts
_______________________________________________
Tutor maillist - Tutor@python.org
To unsubscribe or change subscription options:
http://mail.python.org/mailman/listinfo/tutor
