Re: string methods (warning, newbie)
On Sun, 27 Feb 2005 18:12:17 -0700, rumours say that Steven Bethard <[EMAIL PROTECTED]> might have written: [snip Nick Coghlan's list comprehension] [STeVe] >On the other hand, filter doesn't do the same thing: > >py> s = u'The Beatles - help - 03 - Ticket to ride' >py> filter(str.isalpha, s) >Traceback (most recent call last): > File "", line 1, in ? >TypeError: descriptor 'isalpha' requires a 'str' object but received a >'unicode' >py> ''.join(c for c in s if c.isalpha()) >u'TheBeatleshelpTickettoride' This works though: .>> filter(type(s).isalpha, s) -- TZOTZIOY, I speak England very best. "Be strict when sending and tolerant when receiving." (from RFC1958) I really should keep that in mind when talking with people, actually... -- http://mail.python.org/mailman/listinfo/python-list
Re: string methods (warning, newbie)
On Sun, 27 Feb 2005 18:12:17 -0700, rumours say that Steven Bethard <[EMAIL PROTECTED]> might have written: [snip Nick Coghlan's list comprehension] [STeVe] >On the other hand, filter doesn't do the same thing: > >py> s = u'The Beatles - help - 03 - Ticket to ride' >py> filter(str.isalpha, s) >Traceback (most recent call last): > File "", line 1, in ? >TypeError: descriptor 'isalpha' requires a 'str' object but received a >'unicode' >py> ''.join(c for c in s if c.isalpha()) >u'TheBeatleshelpTickettoride' This works though: .>> filter(type(s).isalpha, s) As a function just for clarity. -- TZOTZIOY, I speak England very best. "Be strict when sending and tolerant when receiving." (from RFC1958) I really should keep that in mind when talking with people, actually... -- http://mail.python.org/mailman/listinfo/python-list
Re: string methods (warning, newbie)
Nick Coghlan wrote: Jimmy Retzlaff wrote: The approach you are considering may be easier than you think: filter(str.isalpha, 'The Beatles - help - 03 - Ticket to ride') 'TheBeatleshelpTickettoride' Hmm, I think this is a case where filter is significantly clearer than the equivalent list comprehension: Py> "".join([c for c in 'The Beatles - help - 03 - Ticket to ride' if c.isalpha( )]) 'TheBeatleshelpTickettoride' On the other hand, filter doesn't do the same thing: py> s = u'The Beatles - help - 03 - Ticket to ride' py> filter(str.isalpha, s) Traceback (most recent call last): File "", line 1, in ? TypeError: descriptor 'isalpha' requires a 'str' object but received a 'unicode' py> ''.join(c for c in s if c.isalpha()) u'TheBeatleshelpTickettoride' Ideally, you could use something like basestring.isalpha and have it work for both str and unicode, but no such luck. =) STeVe -- http://mail.python.org/mailman/listinfo/python-list
Re: string methods (warning, newbie)
Jimmy Retzlaff wrote: Anthonyberet wrote: Is there a string mething to return only the alpha characters of a string? eg 'The Beatles - help - 03 - Ticket to ride', would be 'TheBeatlesTickettoride' If not then how best to approach this? I have some complicated plan to cut the string into individual characters and then concatenate a new string with the ones that return true with the .isalpha string method. Is there an easier way? The approach you are considering may be easier than you think: filter(str.isalpha, 'The Beatles - help - 03 - Ticket to ride') 'TheBeatleshelpTickettoride' Thanks very much - that's the level of knowledge of Python that I just don't have yet - everything I try to do seems to have a much easier way, that I haven't encountered yet :) I shall read up on the elements of your code to understand exactly what it is doing. -- http://mail.python.org/mailman/listinfo/python-list
Re: string methods (warning, newbie)
Jimmy Retzlaff wrote: The approach you are considering may be easier than you think: filter(str.isalpha, 'The Beatles - help - 03 - Ticket to ride') 'TheBeatleshelpTickettoride' Hmm, I think this is a case where filter is significantly clearer than the equivalent list comprehension: Py> "".join([c for c in 'The Beatles - help - 03 - Ticket to ride' if c.isalpha( )]) 'TheBeatleshelpTickettoride' Py> Cheers, Nick. -- Nick Coghlan | [EMAIL PROTECTED] | Brisbane, Australia --- http://boredomandlaziness.skystorm.net -- http://mail.python.org/mailman/listinfo/python-list
Re: string methods (warning, newbie)
"anthonyberet" <[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED] > Is there a string mething to return only the alpha characters of a > string? > eg 'The Beatles - help - 03 - Ticket to ride', would be > 'TheBeatlesTickettoride' I believe you can do this with string.translate (string module, not str()) tjr -- http://mail.python.org/mailman/listinfo/python-list
RE: string methods (warning, newbie)
Anthonyberet wrote: > Is there a string mething to return only the alpha characters of a string? > eg 'The Beatles - help - 03 - Ticket to ride', would be > 'TheBeatlesTickettoride' > > If not then how best to approach this? > I have some complicated plan to cut the string into individual > characters and then concatenate a new string with the ones that return > true with the .isalpha string method. > > Is there an easier way? The approach you are considering may be easier than you think: >>> filter(str.isalpha, 'The Beatles - help - 03 - Ticket to ride') 'TheBeatleshelpTickettoride' Jimmy -- http://mail.python.org/mailman/listinfo/python-list
Re: string methods (warning, newbie)
anthonyberet wrote: Is there a string mething to return only the alpha characters of a string? eg 'The Beatles - help - 03 - Ticket to ride', would be 'TheBeatlesTickettoride' If not then how best to approach this? I have some complicated plan to cut the string into individual characters and then concatenate a new string with the ones that return true with the .isalpha string method. Is there an easier way? Look into the string module's "translate" function. It will do this for you fairly easily. -Peter -- http://mail.python.org/mailman/listinfo/python-list
Re: string methods (warning, newbie)
anthonyberet wrote: Is there a string mething [method] to return only the alpha characters of a string? eg 'The Beatles - help - 03 - Ticket to ride', would be 'TheBeatlesTickettoride' erm, no it wouldn't, it would be 'TheBeatleshelpTickettoride', but you get me, I am sure. If not then how best to approach this? I have some complicated plan to cut the string into individual characters and then concatenate a new string with the ones that return true with the .isalpha string method. Is there an easier way? -- http://mail.python.org/mailman/listinfo/python-list
