In article <mailman.500.1378139057.19984.python-l...@python.org>, Anthony Papillion <papill...@gmail.com> wrote:
> On 09/02/2013 11:12 AM, Chris âKwpolskaâ Warrick wrote: > > On Mon, Sep 2, 2013 at 6:06 PM, Anthony Papillion <papill...@gmail.com> > > wrote: > >> Hello Everyone, > >> > >> I have a multi-line string and I need to remove the very first line from > >> it. How can I do that? I looked at StringIO but I can't seem to figure > >> out how to properly use it to remove the first line. Basically, I want > >> to toss the first line but keep everything else. Can anyone put me on > >> the right path? I know it is probably easy but I'm still learning Python > >> and don't have all the string functions down yet. > >> > >> Thanks, > >> Anthony > >> -- > >> http://mail.python.org/mailman/listinfo/python-list > > > > Use split() and join() methods of strings, along with slicing. Like this: > > > > fullstring = """foo > > bar > > baz""" > > > > sansfirstline = '\n'.join(fullstring.split('\n')[1:]) > > > > The last line does this: > > 1. fullstring.split('\n') turns it into a list of ['foo', 'bar', 'baz'] > > 2. the [1:] slice removes the first element, making it ['bar', 'baz'] > > 3. Finally, '\n'.join() turns the list into a string separated by > > newlines ("""bar > > baz""") > > This, of course, worked like a charm. I really need to study the string > methods. In the work I'm doing they are going to come in very handy. > Thank you, Chris! Let me toss out a couple of other possibilities. Not necessarily better, but if you're learning about strings, you might as well learn some other ways to do it: s = """foo bar baz""" print "using index..." i = s.index('\n') print s[i+1:] print "using regex..." import re print re.sub(r'^[^\n]*\n', '', s) I'll admit, the split/slice/join solution is probably the easiest to implement (and to understand when you're reading the code). But, it copies all the data twice; once when split() runs, and again when join() runs. Both the index and regex solutions should only do a single copy. For huge strings, this might matter. For a three-liner as in your example, it doesn't make any difference.
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