For more details, see Python’s documentation. Now, let’s say we create a list with a string in it, like this: x = ["Hello there", 2, False] The string remains in memory until either the list ...

His research group, led by Ph.D. student Orian Leitersdorf in collaboration with researcher Ronny Ronen, has developed PyPIM ...

Not sure about rational support, but SmallTalk and ABC (predecessor to Python) have 'exact' or something, at least for integers, so you can do silly things like 1000!, if you have enough memory ...