I was trying to keep it simple, you'd think by now I'd know better. My
fault and my apology.
It's definitely not all dates and times, the data and character types
vary. This is the output from my log parser script which you helped on the
other day. there are essentially two types of line:
Tue Jun 2 10:22:42 2015<usertag1
name="SE">SE201506012200310389PS01CT1407166S0011.40009.00007.6IN
000000000018.1LB000258]C10259612019466862270088094]L0223PDF</usertag1>
Tue Jun 2 10:22:43 2015<usertag1
name="SE">SE0389icdim01307755C0038.20033.20012.0IN1000000000
0032]C10259612804038813568089577</usertag1>
I have to do several things:
the first type can be of variable length, everything after the ] is an
identifier that I have to separate, some lines have one, some have more
than one, variable length, always delimited by a ]
the second type (line 2) doesn't have the internal datetime stamp, so I
just need to add 14 x's to fill in the space where that date time stamp
would be.
and finally, I have to break these apart and put a descriptor with each.
While I was waiting for a response to this, I put together a script to
start figuring things out (what could possibly go wrong?!?!?! :-) )
and I can't post the exact script but the following is the guts of it:
f1 = open('unformatted.log', 'r')
f2 = open('formatted.log', 'a')
for line in f1:
for tag in ("icdm"):
if tag in line:
newline = 'log datestamp:' + line[0:24] # + and so on to format
the lines with icdm in them including adding 14 x's for the missing
timestamp
f2.write(newline) #write the formatted output to the new log
else:
newline = 'log datestamp:' + line[0:24] # + and so on to format
the non-icdm lines
f2.write(newline)
The problems are:
1. for some reason this iterates over the 24 line file 5 times, and it
writes the 14 x's to every file, so my non-icdm code (the else:) isn't
getting executed. I'm missing something basic and obvious but have no idea
what.
2. I still don't know how to handle the differences in the end of the
non-icdm files (potentially more than identifier ] delimited as described
above).
regards, Richard
On Wed, Jun 3, 2015 at 3:53 PM, Alan Gauld <alan.ga...@btinternet.com>
wrote:
> On 03/06/15 20:10, richard kappler wrote:
>
>> for formatting a string and adding descriptors:
>>
>> test = 'datetimepart1part2part3the_rest'
>>
>
> If this is really about parsing dates and times have
> you looked at the datetime module and its parsing/formatting
> functions (ie strptime/strftime)?
>
> Can I stop using position numbers and start looking for specific
>> characters
>> (the delimiter) and proceed to the end (which is always a constant string
>> btw).
>>
>
> The general answer is probably to look at regular expressions.
> But they get messy fast so usually I'd suggest trying regular
> string searches/replaces and splits first.
>
> But if your pattern is genuinely complex and variable then
> regex may be the right solution.
>
> But if its dates check the strptime() functions first.
>
>
> --
> Alan G
> Author of the Learn to Program web site
> http://www.alan-g.me.uk/
> http://www.amazon.com/author/alan_gauld
> Follow my photo-blog on Flickr at:
> http://www.flickr.com/photos/alangauldphotos
>
>
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