Chris Angelico <ros...@gmail.com>: > Or, even more likely and even more Pythonic: > >>>> [fields[i] for i in selector] > ['y', 'y', 'x'] > > As soon as you get past the easy and obvious case of an existing > function, filter and map quickly fall behind comprehensions in utility > and readability.
The general need is contexts where you need fields[?] act as a function. Of course, lambda i: fields[i] does it. However, weirdly, dicts have get but lists don't. Ok, dict.get() provides for a default value, but couldn't that come in handy for lists as well? Again, lambda would do it for both dicts and lists: lambda i: fields[i] if i >= 0 and i < len(fields) else default lambda key: fields[key] if key in fields else default Marko -- https://mail.python.org/mailman/listinfo/python-list
