searching strings

Gabriel Genellina gagsl-py2 at yahoo.com.ar
Tue Mar 10 05:55:57 CET 2009


En Mon, 09 Mar 2009 23:18:50 -0200, Daniel Dalton <d.dalton at iinet.net.au>  
escribió:

> I'm writing a program where I search a variable (path), and see if it
> contains the whole string of variable name
> so:
> if name in path:
>   ....
> else:
>   ....
>
> One question about this, how can I make it do exactly what it's doing
> now, except ignore case? eg. if I do this:
> i="A"
> j="ab"
> i in j
> should return true... How do I do this?

Short answer:

if i.upper() in j.upper(): ...

Long answer: why upper()? why not lower()? Should use Unicode, casefold()  
(inexistent), and canonical decomposition. See section 3.13 in the Unicode  
specification.
Anyway, this may be "good enough":

 from unicodedata import normalize
def caseinsensitivecmp(a,b):
   return cmp(normalize("NFKD", a).upper(), normalize("NFKD", b).upper())

Apply the same transformation for the "in" operator that you're interested  
in.

-- 
Gabriel Genellina




More information about the Python-list mailing list