How do I say:
x = string.find(files, 'this', 'that', 'the-other')
currently I have to write it like this to make it work:
x = string.find(files, 'this')
y = string.find(files, 'that')
z = string.find(files, 'the-other') 3 33821
"hokiegal99" <ho********@vt.edu> wrote in message
news:3F**************@vt.edu... How do I say:
x = string.find(files, 'this', 'that', 'the-other')
currently I have to write it like this to make it work:
x = string.find(files, 'this') y = string.find(files, 'that') z = string.find(files, 'the-other')
Try this:
x, y, z = map(files.find, ['this', 'that', 'the-other'])
or, if you're just trying to find the first match:
re.search('this|that|the-other', files).start()
OTOH, you've hinted at an application that may not
appropriate for multiple string searches. Instead, look
at building a dictionary or list of files -- they are most
easily searched and better suited for associating other
data such as file sizes, etc.
Raymond Hettinger
On Thu, 07 Aug 2003 23:35:55 -0400, hokiegal99 <ho********@vt.edu> wrote: How do I say:
x = string.find(files, 'this', 'that', 'the-other')
currently I have to write it like this to make it work:
x = string.find(files, 'this') y = string.find(files, 'that') z = string.find(files, 'the-other')
You might try the re module, e.g., import re rxo = re.compile(r'this|that|the-other') pos = 0 while 1:
... m = rxo.search(' Find this or the-other or that and this.', pos)
... if not m: break
... print '%4s: %s' % (m.start(), m.group())
... pos = m.end()
...
6: this
14: the-other
27: that
36: this
If some search strings have a common prefix, you'll have to put
the longest first in the regex, since re grabs the first match it sees.
Regards,
Bengt Richter
[Fredrik Lundh] Francois Pinard wrote:
Given the above,
build_regexp(['this', 'that', 'the-other'])
yields the string 'th(?:is|at|e\\-other)', which one may choose to `re.compile' before use.
the SRE compiler looks for common prefixes, so "th(?:is|at|e\\-other)" is no different from "this|that|the-other" on the engine level.
Thanks for the note. So the `build_regexp' function is not useful after
all. It was indirectly written around a speed problem in the GNU regexp
engine, but seemingly, the Python regexp engine knows better already. AsI
wrote earlier, I first saw Emacs Lisp `regexp-opt' used within `enscript'..
A speed comparison between both methods shows that they are fairly
equivalent. A small difference is that `build_regexp', given that one of
the word is a prefix of another, automatically recognises the longest one,
while a naive regexp of '|'.join(words) recognises whatever happens to be
listed first. Of course, this is easily solved by sorting, then reversing
the word list before producing the naive regexp.
--
François Pinard http://www.iro.umontreal.ca/~pinard This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics
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