Problem with filter()
Hey all,
So I'm trying to filter a list with the built-in function
filter(). My list looks something like this:
['logs', 'rqp-8.2.104.0.dep', 'rqp-8.2.93.0.dep',
'rqp-win32-app-8.2.96.0-inst.tar.gz',
'rqp-win32-app-8.2.96.0-inst.tar.gz']
Calling filter like this: compFiles = filter(is_Dev, compFiles)
compFiles is my list and is_dev is the following
def is_Dev(stringy):
print stringy
stringx = stringy.split('-')
if stringx[1] == r'win32':
if stringx[2] == r'app':
if stringx[4] == r'dev.tar.gz':
return 1
For some reason I only get 'logs' printed when is_Dev is called. (ie.
It's only going through is_dev once)
Does anyone see something wrong that I'm not seeing??
Thanks,
Emile Boudreau
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RE: Problem with filter()
Sorry folks my mistake def is_dev should be:
def is_Dev(stringy):
stringx = stringy.split('-')
if stringx[0] == '':
if stringx[1] == r'win32':
if stringx[2] == r'app':
if stringx[4] == r'dev.tar.gz':
return 1
But now the results of the filter is an empty list and i know it
shouldn't be.
Emile Boudreau
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On
Behalf Of Boudreau, Emile
Sent: Tuesday, April 03, 2007 10:52 AM
To: python-list@python.org
Subject: Problem with filter()
Hey all,
So I'm trying to filter a list with the built-in function
filter(). My list looks something like this:
['logs', 'rqp-8.2.104.0.dep', 'rqp-8.2.93.0.dep',
'rqp-win32-app-8.2.96.0-inst.tar.gz',
'rqp-win32-app-8.2.96.0-inst.tar.gz']
Calling filter like this: compFiles = filter(is_Dev, compFiles)
compFiles is my list and is_dev is the following
def is_Dev(stringy):
print stringy
stringx = stringy.split('-')
if stringx[1] == r'win32':
if stringx[2] == r'app':
if stringx[4] == r'dev.tar.gz':
return 1
For some reason I only get 'logs' printed when is_Dev is called. (ie.
It's only going through is_dev once)
Does anyone see something wrong that I'm not seeing??
Thanks,
Emile Boudreau
This message may contain privileged and/or confidential
information. If you have received this e-mail in error or are not the
intended recipient, you may not use, copy, disseminate or distribute it;
do not open any attachments, delete it immediately from your system and
notify the sender promptly by e-mail that you have done so. Thank you.
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Re: Problem with filter()
On 4/3/07, Boudreau, Emile [EMAIL PROTECTED] wrote:
Sorry folks my mistake def is_dev should be:
def is_Dev(stringy):
stringx = stringy.split('-')
if stringx[0] == '':
if stringx[1] == r'win32':
if stringx[2] == r'app':
if stringx[4] == r'dev.tar.gz':
return 1
But now the results of the filter is an empty list and i know it shouldn't
be.
Well, you haven't told us what you expect the result to be, but as far
as I can tell, an empty list is the correct answer, because you don't
have any files in your list that match your rules.
This line
if stringx[0] == '':
is very likely your problem. That requires that your file start with
a '-', so that after you split it stringx[0] will equal ''.
You may need something more like this:
def is_Dev(stringy):
print stringy
try:
stringx = stringy.split('-')
if stringx[1] == r'win32':
if stringx[2] == r'app':
if stringx[4] == r'dev.tar.gz':
return 1
except IndexError, e:
pass
That will still give you an empty list when run on your proposed
inputs though, because none of them are of the form
something-win32-app-something-dev.tar.gz
If this doesn't help, please give us some sample inputs and what you
expect the output to be.
--
Jerry
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Problem with filter()
Sorry folks my mistake def is_dev should be:
def is_Dev(stringy):
stringx = stringy.split('-')
if stringx[0] == '':
if stringx[1] == r'win32':
if stringx[2] == r'app':
if stringx[4] == r'dev.tar.gz':
return 1
But now the results of the filter is an empty list and i know it shouldn't
be.
I think the problem is the first if - using the list from your previous
mail, stringx[0] is never empty. So the filter fn never returns true, the
return list is empty...
stringx[4] never matches either.
This is what I did:
compFiles=['logs', 'rqp-8.2.104.0.dep', 'rqp-8.2.93.0.dep', '
rqp-win32-app-8.2.96.0-inst.tar.gz', 'rqp-win32-app-8.2.96.0-inst.tar.gz ']
for i in compFiles:
print i.split('-') # ie the equivalent of stringx
['logs']
['rqp', '8.2.104.0.dep']
['rqp', '8.2.93.0.dep']
['rqp', 'win32', 'app', ' 8.2.96.0', 'inst.tar.gz']
['rqp', 'win32', 'app', ' 8.2.96.0', 'inst.tar.gz']
Birone
PS - I'm new at this. Please forgive me if I got it totally wrong!
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Re: Problem with filter()
Boudreau, Emile wrote:
Hey all,
So I'm trying to filter a list with the built-in function
filter(). My list looks something like this:
['logs', 'rqp-8.2.104.0.dep', 'rqp-8.2.93.0.dep',
'rqp-win32-app-8.2.96.0-inst.tar.gz', 'rqp-win32-app-8.2.96.0-inst.tar.gz']
Calling filter like this: compFiles = filter(is_Dev, compFiles)
compFiles is my list and is_dev is the following
def is_Dev(stringy):
print stringy
stringx = stringy.split('-')
if stringx[1] == r'win32':
if stringx[2] == r'app':
if stringx[4] == r'dev.tar.gz':
return 1
Use fnmatch.filter instead?
source = ['logs', 'rqp-8.2.104.0.dep', 'rqp-8.2.93.0.dep',
'rqp-win32-app-8.2.96.0-inst.tar.gz', 'rqp-win32-app-8.2.96.0-inst.tar.gz']
import fnmatch
fnmatch.filter(source, '*-win32-app-*-inst.tar.gz')
['rqp-win32-app-8.2.96.0-inst.tar.gz', 'rqp-win32-app-8.2.96.0-inst.tar.gz']
Michael
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