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Re: Case insensitive exists()?

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On Wed, Jan 22, 2014 at 6:08 PM, Roy Smith <roy@panix.com> wrote:
> In article <mailman.5853.1390438708.18130.python-list@python.org>,
>  Larry Martell <larry.martell@gmail.com> wrote:
>
>> I have the need to check for a files existence against a string, but I
>> need to do case-insensitively. I cannot efficiently get the name of
>> every file in the dir and compare each with my string using lower(),
>> as I have 100's of strings to check for, each in a different dir, and
>> each dir can have 100's of files in it.
>
> I'm not quite sure what you're asking.  Do you need to match the
> filename, or find the string in the contents of the file?  I'm going to
> assume you're asking the former.

Yes, match the file names. e.g. if my match string is "ABC" and
there's a file named "Abc" then it would be match.

> One way or another, you need to iterate over all the directories and get
> all the filenames in each.  The time to do that is going to totally
> swamp any processing you do in terms of converting to lower case and
> comparing to some set of strings.
>
> I would put all my strings into a set, then use os.walk() traverse the
> directories and for each path os.walk() returns, do "path.lower() in
> strings".

The issue is that I run a database query and get back rows, each with
a file path (each in a different dir). And I have to check to see if
that file exists. Each is a separate search with no correlation to the
others. I have the full path, so I guess I'll have to do dir name on
it, then a listdir then compare each item with .lower with my string
.lower. It's just that the dirs have 100's and 100's of files so I'm
really worried about efficiency.

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Thread

Case insensitive exists()? Larry Martell <larry.martell@gmail.com> - 2014-01-22 17:58 -0700
  Re: Case insensitive exists()? Roy Smith <roy@panix.com> - 2014-01-22 20:08 -0500
    Re: Case insensitive exists()? Larry Martell <larry.martell@gmail.com> - 2014-01-22 18:18 -0700
      Re: Case insensitive exists()? Roy Smith <roy@panix.com> - 2014-01-22 20:27 -0500
        Re: Case insensitive exists()? Larry Martell <larry.martell@gmail.com> - 2014-01-22 21:24 -0700
        Re: Case insensitive exists()? Chris Angelico <rosuav@gmail.com> - 2014-01-23 15:29 +1100
        Re: Case insensitive exists()? Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2014-01-23 15:43 +0000
        Re: Case insensitive exists()? Larry Martell <larry.martell@gmail.com> - 2014-01-23 12:02 -0700
      Re: Case insensitive exists()? Dan Sommers <dan@tombstonezero.net> - 2014-01-23 07:51 +0000
  Re: Case insensitive exists()? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-01-23 12:06 +0000
  Re: Case insensitive exists()? Grant Edwards <invalid@invalid.invalid> - 2014-01-23 14:58 +0000

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