(works)|(doesn't work) depending on for loop order

John Machin sjmachin at
Sat Mar 22 22:47:46 CET 2008

On Mar 23, 8:21 am, Marc 'BlackJack' Rintsch <bj_... at> wrote:
> On Sat, 22 Mar 2008 13:27:49 -0700, sgharvey wrote:
> > ... and by works, I mean works like I expect it to.
> > I'm writing my own cheesy config.ini parser because ConfigParser
> > doesn't preserve case or order of sections, or order of options w/in
> > sections.
> > What's confusing me is this:
> >    If I try matching every line to one pattern at a time, all the
> > patterns that are supposed to match, actually match.
> >    If I try to match every pattern to one line at a time, only one
> > pattern will match.
> > What am I not understanding about
> That has nothing to do with `` but how files work.  A file has a
> "current position marker" that is advanced at each iteration to the next
> line in the file.  When it is at the end, it stays there, so you can just
> iterate *once* over an open file unless you rewind it with the `seek()`
> method.
> That only works on "seekable" files and it's not a good idea anyway
> because usually the files and the overhead of reading is greater than the
> time to iterate over in memory data like the patterns.

Unless the OP has changed the pastebin code since you read it, that's
absolutely nothing to do with his problem -- his pastebin code slurps
in the whole .ini file using file.readlines; it is not iterating over
an open file.

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