On Mar 30, 2:09 pm, Michael Bentley <[EMAIL PROTECTED]> wrote: > On Mar 30, 2007, at 10:38 AM, kevinliu23 wrote: > > > > > > > I want to be able to insert a '-' character in front of all numeric > > values in a string. I want to insert the '-' character to use in > > conjunction with the getopt.getopt() function. > > > Rigt now, I'm implementing a menu system where users will be able to > > select a set of options like "2a 3ab" which corresponds to menu > > choices. However, with getopt.getopt(), it'll only return what I want > > if I input -2a -3ab as my string. I don't want the user have to insert > > a '-' character in front of all their choices, so I was thinking of > > accepting the string input first, then adding in the '-' character > > myself. > > > So my qusetion is, how do I change: > > > "2a 3ab" into "-2a -3ab". > > Will the first character always be a digit? > > for i in yourstring.split(): > if i[0].isdigit(): > yourstring = yourstring.replace(i, '-%s' % (i,)) > > Or are these hex numbers?- Hide quoted text - > > - Show quoted text -
Your replace strategy is risky. If: yourstring = "1ab 2bc 3de 11ab" it will convert to -1ab -2bc -3de 1-1ab -- Paul -- http://mail.python.org/mailman/listinfo/python-list
