Loop structures: Difference between revisions

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@@ Line 747: / Line 747: @@
 ===for===
+Typically for is used to iterate over items in an iteratable:
- for i in range(10):
-     print i
- else:
-     # break was not called
-     foo()
  for x in ["foo", "bar", "baz"]:
      print x
+It is also used to create indexes:
-''Does range(10) return an array?  The above two examples may be redundant.''
+ for i in xrange(10):
+     print numbers[i]
+Optional else is executed if break was not use to stop the loop:
+ for i in numbers:
+     if item < 0:
+         break
+ else:
+     print 'all numbers are positive'
 ==[[Ruby]]==