2009/10/19 Eduardo Vieira <eduardo.su...@gmail.com>:
> mylist = ['John', 'Canada', 25, 32, 'right']
> a = [item.upper() for item in mylist if type(item) == type('good')]
Usually it is recommended to use hasattr() instead of type()
hasattr(s, 'upper')
> returned this: ['JOHN', 'CANADA', 'RIGHT']
> I was expecting this: ['JOHN', 'CANADA', 25, 32, 'RIGHT']
> So, actually the "if" acted like a filter.
> In order to use a list comprehension I created this function instead.
> def upperfy(item)
> try:
> item = item.upper()
> except AttributeError:
> pass
> return item
I would move return item under the except and remove the pass, other
might disagree on this.
> a = [upperfy(item) for item in mylist]
You can use this which gives the added benefit that you can document
why you are using this within the function. But you can include else
in list comprehension.
a = [item.upper() if hasattr(item, 'upper') else item for item in mylist]
Your case it might be "overkill" to use the function.
Greets
Sander
_______________________________________________
Tutor maillist - Tutor@python.org
To unsubscribe or change subscription options:
http://mail.python.org/mailman/listinfo/tutor
