Can anyone please give me answer. Since in both the cases I can pass anything, then what is the difference between two.
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This question has already answer here: http://stackoverflow.com/questions/6231973/difference-between-list-list-listt-liste-and-listobject – Chandra Prakash Dec 18 '14 at 18:52
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Never used the `?` before, but I know you can put restrictions on what `
` is. Can you do the same for `?` – DJ Burb Dec 18 '14 at 18:52