[Tutor] position of an element in list:
Hello all, How to return the position of a character in a string. Say I have str1 = welcome to the world if i want to return the position of the first occurrence of o how to do it? Thanks Vin ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] position of an element in list:
You can do it with any iterator Astr.index('o') I'm not sure what happens
when there are multiple instances of 'o' though, check the docs on index.
Sent from my iPhone
On Jul 23, 2010, at 8:22 AM, Vineeth Rakesh vineethrak...@gmail.com wrote:
Hello all,
How to return the position of a character in a string. Say I have str1 =
welcome to the world if i want to return the position of the first
occurrence of o how to do it?
Thanks
Vin
___
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___
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Re: [Tutor] position of an element in list:
On 23/07/2010 15:22, Vineeth Rakesh wrote:
Hello all,
How to return the position of a character in a string. Say I have str1
= welcome to the world if i want to return the position of the first
occurrence of o how to do it?
Thanks
Vin
___
Tutor maillist - Tutor@python.org
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Strings have a function called index, which take a string argument which
is what you're looking for. So you can do str1.index('o') which would
return 4.
--
Kind Regards,
Christian Witts
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Re: [Tutor] position of an element in list:
On Fri, 23 Jul 2010 11:22:54 pm Vineeth Rakesh wrote: Hello all, How to return the position of a character in a string. Say I have str1 = welcome to the world if i want to return the position of the first occurrence of o how to do it? str1.find(o) will return the index of the first o, or -1 if not found. str1.rfind(o) does the same, but searches from the right instead of the left. str1.index(o) is like find, but it raises an exception instead of returning -1. Naturally there is a rindex as well. -- Steven D'Aprano ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] position of an element in list:
On 23/07/2010 16:43, Steven D'Aprano wrote: On Fri, 23 Jul 2010 11:22:54 pm Vineeth Rakesh wrote: Hello all, How to return the position of a character in a string. Say I have str1 = welcome to the world if i want to return the position of the first occurrence of o how to do it? str1.find(o) will return the index of the first o, or -1 if not found. str1.rfind(o) does the same, but searches from the right instead of the left. str1.index(o) is like find, but it raises an exception instead of returning -1. Naturally there is a rindex as well. For the OP and possibly others, all of these methods have optional start and end arguments. Help for find shows:- find(...) S.find(sub [,start [,end]]) - int Return the lowest index in S where substring sub is found, such that sub is contained within s[start:end]. Optional arguments start and end are interpreted as in slice notation. Return -1 on failure. Mark Lawrence ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] position of an element in list:
Vineeth Rakesh vineethrak...@gmail.com wrote How to return the position of a character in a string. Say I have str1 = welcome to the world if i want to return the position of the first occurrence of o how to do it? Others have answered but don't forget Python's help() facility. help(str) Would have probably got your answer a lot faster than posting a question and waiting for replies. We don't mind helping but for these kinds of question its usually quicker to try a help(), dir() or even a Google search first. It saves your time and ours. HTH, -- Alan Gauld Author of the Learn to Program web site http://www.alan-g.me.uk/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
