Return an enumerate object. must be a sequence, an , or other object which supports iteration. The method of the iterator returned by returns a tuple containing a count (from which defaults to 0) and the values obtained from iterating over .If no argument is given, is returned.
When a function is passed as an argument to a higher-order function, labels must match in both types. Neither adding nor removing labels are allowed. In practice, such problems appear mostly when using objects whose methods have optional arguments, so that writing the type of object arguments is often a good idea.
It’s more often useful to treat special functions as ordinary functions. For example, we could use to add 3 to every element of a list by first a function , like this: When does printing a function not show what environment it was created in?
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is a user-friendly version and wrapper of by default returning a vector, matrix or, if , an array if appropriate, by applying . is the same as .