Re: [Tutor] Pager in Python?

> > > >Is there a command like more(1) or less(1) in python to display > > > >the output of a command (e.g. dir()) one page at a time? You could always write your own ... eg: def page(it, numLines=20): if isinstance(it, dict): it = it.iteritems() for i, x in enumerate(it): prin

Re: [Tutor] how to write a line

> but how do i overwrite a line value with another value ? > > i mean, how do go to, say, line 3 of a text file and replace > what is written on line 3 with something else? You can't do it directly easily unless the new version happens to be the exact same length as the original. In practice you

Re: [Tutor] Pager in Python?

> xterm is a pretty old console. Even so, you do have access to a > ... > command line switches for xterm to add scrollbars if you need. The best scroll bars ever invented IMHO, much more powerful and controllable than those in OS X or Windoze, even better then the OpenLook scrollers of yesterye

Re: [Tutor] how to write a line

i get it. manipulate everything while it is read. make my changes and use writelines(list from readlines earlier) so i kinda just hold everything in the list until i overwrite the original. thats great. my file is only 8 lines long. no problem thanks a lot ! Seems easy now. -shawn On 07/25/2005 04:

Re: [Tutor] how to write a line

On Mon, 25 Jul 2005, nephish wrote: > i know how to read the lines of a txt file. > i know how to write a txt file. > > but how do i overwrite a line value with another value ? > > i mean, how do go to, say, line 3 of a text file and replace what is > written on line 3 with something else? Hi N

Re: [Tutor] Parsing problem

Liam - I made some changes and timed them, I think this problem is solvable. (All timings are done using your data, on a P4 800MHz laptop.) 1. Baseline, the current state, in the parser code you sent me: bracketGroup << ( pp.Group( LBRACE + ( pp.empty ^ pp.OneOrMore(assignment) ^ pp.OneOrMore(i

Re: [Tutor] Parsing problem

One other thing, Liam. Download the latest version of pyparsing (1.3.2), and make this change to the assignment statement: assignment << pp.Dict( pp.Group( LHS + EQUALS + RHS ) ) Now you can write clean-looking code like: test = """j = { line = { foo = 10 bar = 20 } } }""" res = assignment.par

Re: [Tutor] Parsing problem

Liam - The two arguments to Word work this way: - the first argument lists valid *initial* characters - the second argument lists valid *body* or subsequent characters For example, in the identifier definition, identifier = pp.Word(pp.alphas, pp.alphanums + "_/:.") identifiers *must* start wit

Re: [Tutor] Parsing problem

Liam - Could you e-mail me your latest grammar? The last version I had includes this definition for RHS: RHS << ( pp.dblQuotedString.setParseAction(pp.removeQuotes) ^ identifier ^ integer ^ pp.Group( LBRACE + pp.ZeroOrMore( assignment ^ RHS ) + RBRACE ) ) What happens

Re: [Tutor] Parsing problem

Liam - I just uploaded an update to pyparsing, version 1.3.2, that should fix the problem with using nested Dicts. Now you won't need to use [0] to dereference the "0'th" element, just reference the nested elements as a.b.c, or a["b"]["c"]. -- Paul -Original Message- From: Liam Clarke

Re: [Tutor] Parsing problem

Hi Paul, That is fantastic. It works, and using that pp.group is the key with the nested braces. I just ran this on the actual file after adding a few more possible values inside the group, and it parsed the entire header structure rather nicely. Now this will probably sound silly, but from th

Re: [Tutor] Parsing problem

Liam - Great, this sounds like it's coming together. Don't be discouraged, parsing text like this has many forward/backward steps. As far as stopping after one assignent, well, you might kick yourself over this, but the answer is that you are no longer parsing just a single assignment, but a lis

Re: [Tutor] Pager in Python?

> > >Is there a command like more(1) or less(1) in python to display > > >the output of a command (e.g. dir()) one page at a time? > > > > > > How are you using dir() ? > > > > Is it in the "DOS Window" ? > > One option would be to just get a better console. > >I am using Python 2.4 on RedHat Linux

[Tutor] how to write a line

Hey there, kinda newbie question here. i know how to read the lines of a txt file. i know how to write a txt file. but how do i overwrite a line value with another value ? i mean, how do go to, say, line 3 of a text file and replace what is written on line 3 with something else? thanks <><

Re: [Tutor] Parsing problem

Hi Paul, Well various tweaks and such done, it parses perfectly, so much thanks, I think I now have a rough understanding of the basics of pyparsing. Now, onto the fun part of optimising it. At the moment, I'm looking at 2 - 5 minutes to parse a 2000 line country section, and that's with psyco.