Newbie string questions
Hey everyone, This is a super noob question, so please be gentle. I am working my way through Learn Python the Hard Way using both python 2.7 and python 3.1 (I want to get a handle on the differences between the two - the intention to write things in python 3 but be able to understand things from python 2). The first quarter or so of the book details lots of stuff about strings. Most of the learning is by doing, with less of an emphasis on the theory behind what certain things actually do. The issue is, I can't seem to find some of the items in the documentation. Right now what is stumping me... what exactly does %r do? I can't find it in the documentation anywhere. -Matty -- http://mail.python.org/mailman/listinfo/python-list
Re: Newbie string questions
On Wed, May 25, 2011 at 11:06 PM, Matty Sarro msa...@gmail.com wrote: Right now what is stumping me... what exactly does %r do? You're talking about the formatting operator? It's like the repr function: http://docs.python.org/library/functions.html#repr Chris Angelico -- http://mail.python.org/mailman/listinfo/python-list
Re: Newbie string questions
On Wednesday, May 25, 2011 9:06:02 AM UTC-4, Matty Sarro wrote: can't seem to find some of the items in the documentation. Right now what is stumping me... what exactly does %r do? I can't find it in the documentation anywhere. Matty, %r in a format string is very much like %s. %s calls str(your_object) in order to produce the resulting string. %r calls repr(your_object). Generally, you'd want to use %s for strings that will surface to a user, while %r is great for debugging and logging. Also, if you haven't come across repr(), you should be able to find that in the docs; it's also considered good practice to overload repr() in your own classes in order to provide a useful representation for your objects. -- http://mail.python.org/mailman/listinfo/python-list
Re: Newbie string questions
Thanks guys! I appreciate it. I was wondering why %r was always showing things enclosed in single-quotes. On Wed, May 25, 2011 at 9:13 AM, Chris Guidry ch...@theguidrys.us wrote: On Wednesday, May 25, 2011 9:06:02 AM UTC-4, Matty Sarro wrote: can't seem to find some of the items in the documentation. Right now what is stumping me... what exactly does %r do? I can't find it in the documentation anywhere. Matty, %r in a format string is very much like %s. %s calls str(your_object) in order to produce the resulting string. %r calls repr(your_object). Generally, you'd want to use %s for strings that will surface to a user, while %r is great for debugging and logging. Also, if you haven't come across repr(), you should be able to find that in the docs; it's also considered good practice to overload repr() in your own classes in order to provide a useful representation for your objects. -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
string questions
Hi everyone, I'm a beginning programming student in Python and have a few questions regarding strings. If s1 = spam If s2 = ni! 1. Would string.ljust(string.upper(s2),4) * 3 start it at the left margin and move it 12 spaces to the right because of the 4 *3? If so, why is it in the parathesis for the upper command and not the ljust? I already know that it would cap it to NI! 2. To get the output Spam Ni! Spam Ni! Spam Ni! I could do something like this string.join ([s1, s2]), But I'm a little lost how to get it repeated three times on one line. Would I just have to put the same command on the next two lines? 3. To change spam to spm, the string.replace seems to be the best function to use. However, when I use string.replace(s1, a, ) in python to replace a with an empty space, it doesn't work...I just get spam back when I print s1. Any ideas? Thanks. -Shawn -- http://mail.python.org/mailman/listinfo/python-list
Re: string questions
On Sat, 15 Sep 2007 19:52:47 -0400, Shawn Minisall wrote: Hi everyone, I'm a beginning programming student in Python and have a few questions regarding strings. If s1 = spam If s2 = ni! 1. Would string.ljust(string.upper(s2),4) * 3 start it at the left margin and move it 12 spaces to the right because of the 4 *3? If so, why is it in the parathesis for the upper command and not the ljust? I already know that it would cap it to NI! Fire up the interpreter and just try it. And then the different parts to know whats going on in detail. But please don't use the functions in `string` that are also available as methods on strings. Those functions are deprecated. 2. To get the output Spam Ni! Spam Ni! Spam Ni! I could do something like this string.join ([s1, s2]), But I'm a little lost how to get it repeated three times on one line. Would I just have to put the same command on the next two lines? Try out the code from 1. and you should get an idea ho to repeat three times. 3. To change spam to spm, the string.replace seems to be the best function to use. However, when I use string.replace(s1, a, ) in python to replace a with an empty space, it doesn't work...I just get spam back when I print s1. Any ideas? Yes, read the documentation to find out that `replace()` does not alter the string -- strings in Python are immutable -- but returns a new, changed string. Ciao, Marc 'BlackJack' Rintsch -- http://mail.python.org/mailman/listinfo/python-list
Re: string questions
Marc 'BlackJack' Rintsch wrote: But please don't use the functions in `string` that are also available as methods on strings. Those functions are deprecated. Meaning (for newbie clarification): instead of string.upper(s2), just do s2.upper(). For more detail, see the docs. -- http://mail.python.org/mailman/listinfo/python-list
