--- John Fouhy <[EMAIL PROTECTED]> wrote: > Hi Hoffmann, > > On 11/04/06, Hoffmann <[EMAIL PROTECTED]> wrote: > > I have a list: list1 = [ 'spam!', 2, ['Ted', > 'Rock'] ] > > and I wrote the script below: > > > > i = 0 > > while i < len(list1): > > print list1[i] > > i += 1 > > Have you read about "for" loops? The pythonic way > of looping through > a list is to do something like this: > > for item in list1: > print item > > This will produce the same output as your code > above, but is much > nicer to read :-) > > > I also would like to print the length of each > element > > of that list: > > > > spam! = 1 element > > 2 = 1 element > > ['Ted', 'Rock'] = 2 elements > > The challenge here is that your list contains a > mixture of different types. > > For example, the len() function will tell us that > ['Ted', 'Rock'] has > two elements. But it would also tell us that > 'spam!' has five > elements, and it would raise an exception if we > tried to find the > length of 2. > > So you will need to ask python about the type of > element you're > looking at. One possibility that might work for you > is this: > > for item in list1: > if isinstance(item, (tuple, list)): > print len(item) > else: > print 1 > > May I ask why you're doing this? This feels like a > situation where > you need to think clearly what your goals are before > you go diving > towards a solution :-) > > -- > John. > _______________________________________________ > Tutor maillist - Tutor@python.org > http://mail.python.org/mailman/listinfo/tutor >
Hi John, This is just a version of a book exercise (How to think like a computer scientist - learning with python, by Downey, Elkner, and Meyers), page 84. Thanks, Hoffmann __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
