Re: Using wild character
On Thu, 06 Sep 2007 16:48:31 -0700, Zentrader wrote:
On Sep 6, 12:47 am, Marc 'BlackJack' Rintsch [EMAIL PROTECTED] wrote:
On Wed, 05 Sep 2007 22:54:55 -0700, TheFlyingDutchman wrote:
To do a *string wildcard filter use the endswith() function instead
of startswith() and to do a *string* type wildcard filter use
the find() function -1.
Maybe better the ``in`` operator for the '*string*' type. `str.find()`
will go away in the future.
string.find serves a useful purpose in that it returns the starting
location of the string found, or -1 if not found, so if you wanted to
slice abdecf onc, string.find will tell you where that is.
But that position is not needed here and I think::
result = [name for name in names if 'spam' in name]
reads more natural than::
result = [name for name in names if name.find('spam') -1]
Ciao,
Marc 'BlackJack' Rintsch
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Re: Using wild character
On Sep 5, 10:00 pm, Sreeraj [EMAIL PROTECTED] wrote: hi, I am a beginner in Python. I wish to know how can i filter a list of strings using wild characters.ie Lets say i have list countries = [india,africa,atlanta,artica,nigeria]. I need only the list of string starting with 'a'. thank you Sreeraj The most thorough answer would no doubt involve regular expressions, but they can be unpleasant. To do a string* type wildcard filter as in your request: myList = [india,africa,atlanta,artica,nigeria] newList = [ item for item in myList if item.startswith(a) ] To do a *string wildcard filter use the endswith() function instead of startswith() and to do a *string* type wildcard filter use the find() function -1. -- http://mail.python.org/mailman/listinfo/python-list
Re: Using wild character
Sreeraj schrieb: hi, I am a beginner in Python. I wish to know how can i filter a list of strings using wild characters.ie Lets say i have list countries = [india,africa,atlanta,artica,nigeria]. I need only the list of string starting with 'a'. While the startswith-method others pointed out works, I wanted to direct you attention to the module fnmatch. http://www.python.org/doc/current/lib/module-fnmatch.html It will work with real wildcards. Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: Using wild character
On Wed, 05 Sep 2007 22:54:55 -0700, TheFlyingDutchman wrote: To do a *string wildcard filter use the endswith() function instead of startswith() and to do a *string* type wildcard filter use the find() function -1. Maybe better the ``in`` operator for the '*string*' type. `str.find()` will go away in the future. Ciao, Marc 'BlackJack' Rintsch -- http://mail.python.org/mailman/listinfo/python-list
Re: Using wild character
On Sep 6, 12:47 am, Marc 'BlackJack' Rintsch [EMAIL PROTECTED] wrote: On Wed, 05 Sep 2007 22:54:55 -0700, TheFlyingDutchman wrote: To do a *string wildcard filter use the endswith() function instead of startswith() and to do a *string* type wildcard filter use the find() function -1. Maybe better the ``in`` operator for the '*string*' type. `str.find()` will go away in the future. Ciao, Marc 'BlackJack' Rintsch string.find serves a useful purpose in that it returns the starting location of the string found, or -1 if not found, so if you wanted to slice abdecf onc, string.find will tell you where that is. -- http://mail.python.org/mailman/listinfo/python-list
Re: Using wild character
En Thu, 06 Sep 2007 22:19:56 -0300, TheFlyingDutchman [EMAIL PROTECTED] escribi�: The Perl community has an expression There is more than one way to do it. As in, Perl is good because you have multiple choices (whether it's a function/module/class/operator) of how to implement a particular piece of logic. More choices is often good, but this can lead to a problem in that you might be presented with more things to learn and or you come across less common ways of doing something that you are not familiar with in code you are trying to understand. Does the Python community have a position regarding duplicate ways in the language to achieve something in your code? Python 2.5.1 (r251:54863, Apr 18 2007, 08:51:08) [MSC v.1310 32 bit (Intel)] on win32 Type help, copyright, credits or license for more information. py import this -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
Re: Using wild character
On Sep 6, 5:53 pm, Gabriel Genellina [EMAIL PROTECTED] wrote: En Thu, 06 Sep 2007 20:48:31 -0300, Zentrader [EMAIL PROTECTED] escribi?: On Sep 6, 12:47 am, Marc 'BlackJack' Rintsch [EMAIL PROTECTED] wrote: Maybe better the ``in`` operator for the '*string*' type. `str.find()` will go away in the future. string.find serves a useful purpose in that it returns the starting location of the string found, or -1 if not found, so if you wanted to slice abdecf onc, string.find will tell you where that is. PEP3100 says it will be removed, but at the same time says [UNLIKELY]... http://www.python.org/dev/peps/pep-3100/#id36 partition serves almost the same purpose and its easier to use. -- Gabriel Genellina The Perl community has an expression There is more than one way to do it. As in, Perl is good because you have multiple choices (whether it's a function/module/class/operator) of how to implement a particular piece of logic. More choices is often good, but this can lead to a problem in that you might be presented with more things to learn and or you come across less common ways of doing something that you are not familiar with in code you are trying to understand. Does the Python community have a position regarding duplicate ways in the language to achieve something in your code? -- http://mail.python.org/mailman/listinfo/python-list
Re: Using wild character
En Thu, 06 Sep 2007 20:48:31 -0300, Zentrader [EMAIL PROTECTED] escribi�: On Sep 6, 12:47 am, Marc 'BlackJack' Rintsch [EMAIL PROTECTED] wrote: Maybe better the ``in`` operator for the '*string*' type. `str.find()` will go away in the future. string.find serves a useful purpose in that it returns the starting location of the string found, or -1 if not found, so if you wanted to slice abdecf onc, string.find will tell you where that is. PEP3100 says it will be removed, but at the same time says [UNLIKELY]... http://www.python.org/dev/peps/pep-3100/#id36 partition serves almost the same purpose and its easier to use. -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
Re: Using wild character
On 9/6/07, Sreeraj [EMAIL PROTECTED] wrote:
hi,
I am a beginner in Python. I wish to know how can i filter a list of
strings using wild characters.ie
Lets say i have list countries =
[india,africa,atlanta,artica,nigeria]. I need only the list
of string starting with 'a'.
There are a few ways of doing so. For some simple operations there are
functions on the strings, If you want some more complex filtering
then have a look at Python's regular expression module re.
example:
l = [india,africa,atlanta,artica,nigeria]
al = [c for c in l if c.startswith('a')] # this is a list comprehension
al
['africa', 'atlanta', 'artica']
To know more about list comprehensions, have a look at:
http://docs.python.org/tut/node7.html#SECTION00714
Methods on strings:
http://docs.python.org/lib/string-methods.html#string-methods
Btw, not all of names in your list are countries !
Cheers,
--
Amit Khemka
website: www.onyomo.com
wap-site: www.owap.in
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Re: Using wild character
i hope this may help you.
countries = [india,africa,atlanta,artica,nigeria]
filtered = filter(lambda item: item.startswith('a'), l)
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Re: Using wild character
i will this may help you.
countries = [india,africa,atlanta,artica,nigeria]
filter(lambda country: country.startswith('a'), countries)
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