String manipulation advice needed.

[Raaijmakers, Vincent (GE Infrastructure)]

What is the easiest way of getting this information out of a string:

foo = "My number 70 is what I want to parse" => 70
foo = "My info {info} between the curly brackets is what I want to parse" => {info}
foo = "My info between [hello world] is what I want to parse" => [hello world]

At this moment my way to go is splitting the strings in substring, and do different checks on these substrings like:
- try: int(substring)
- substring.find('{') or substring.find('[')

Works but.. my guess is that it can be way more smarter, I must miss a strong library that can help me in simplifying the job.

Thanks,
Vincent


-----Original Message-----
From: [email protected]
[mailto[email protected]]On
Behalf Of Duncan Booth
Sent: Monday, March 01, 2004 8:54 AM
To: (e-mail address removed)
Subject: Re: pyAlbum

Some fairly rudimentary fact-checking would have prevented the
errors/oversights listed above.

A few more:

Slide 17: 'Tuples are enclosed in parentheses'

The commas make the tuple, not the parentheses. The first example could
equally be written:

myTuple = 1, 4, 5

Parentheses are only required to remove ambiguity (or for empty tuples).

Slide 21, it is worth pointing out the weakness of '{', '}' which is that
the parenthese you think match up by looking at the block structure aren't
necessarily the ones that do match: as in the example given where the last
'}' actually closes the else block.

The 'if' statement shows the full range if..elif..else. It would be
consistent to mention the else clause on while and for loops also.

 

[Istvan Albert]

Raaijmakers, Vincent (GE Infrastructure) wrote:

Works but.. my guess is that it can be way more smarter,
I must miss a strong library that can help me in simplifying the job.

this is exactly what pyparsing was developed for:

http://pyparsing.sourceforge.net/

Istvan.