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what is the difference between range & xrange (py)

Posted by python_myfav (python_myfav), 26 March 2005
i just want to know the difference between range and xrange in python.
i tried out many examples but i find them to be similar  

Posted by admin (Graham Ellis), 26 March 2005
You'll find that they often appear to be identical, BUT ...

The range function generates an internal temporary list which is (usually) then handled item by item, whereas xrange produces an interator through which you can pass without the expense of what could be a large temporary list object.


for x in range(10000):
will generate a list of ten thousand elements, and will then loop through each of them in turn

for x in xrange(10000):
will genarate ten thousand integers one by one, passing each to the variable x in turn.

So xrange is the one to use if you're looking to generate a huge list of numbers to pass through in something like a for loop, but range is much more flexible as it truely generates an anonymous list.

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