Drew a écrit : > When is it appropriate to use dict.items() vs dict.iteritems. Both > seem to work for something like: > > for key,val in mydict.items(): > print key,val > > for key,val in mydict.iteritems(): > print key,val > > Also, when is it appropriate to use range() vs xrange(). From my > understanding, xrange() essentially gives you an iterator across a > range, so it should be used when iterating. Should you only use > range() when want to physically store the range as a list?
iteritems and xrange only provide values when requested. items and range build complete list when called. Both work, you may prefer xrange/iteritems for iteration on large collections, you may prefer range/items when processing of the result value explicitly need a list (ex. calculate its length) or when you are going to manipulate the original container in the loop. A+ Laurent. -- http://mail.python.org/mailman/listinfo/python-list
