> -----Original Message----- > From: [EMAIL PROTECTED] [mailto:python- > [EMAIL PROTECTED] On Behalf Of cesco > Sent: Wednesday, January 09, 2008 5:34 AM > To: python-list@python.org > Subject: alternating string replace > > Hi, > > say I have a string like the following: > s1 = 'hi_cat_bye_dog' > and I want to replace the even '_' with ':' and the odd '_' with ',' > so that I get a new string like the following: > s2 = 'hi:cat,bye:dog' > Is there a common recipe to accomplish that? I can't come up with any > solution... >
For those of us who still think in Perl, here's an easy to read, lazy solution: s = 'hi_cat_bye_dog' print s s = re.sub(r'_(.*?(_|$))', r':\1', s) ## every odd '_' to ':' print s s = re.sub(r'_', r',', s) ## every even '_' to ',' print s > hi_cat_bye_dog > hi:cat_bye:dog > hi:cat,bye:dog The equivalent Perl code: my $s = 'hi_cat_bye_dog'; print $s, "\n"; $s =~ s/_(.*?(_|$))/:$1/g; print $s, "\n"; $s =~ s/_/,/g; print $s, "\n"; -- http://mail.python.org/mailman/listinfo/python-list
