xrange in python 3??

[king_koder]

What does xrange do in python?? And how do I implement a similar function in Python3??

[Gribouillis]

In a terminal:

$ pydoc xrange

class xrange(object)
 |  xrange([start,] stop[, step]) -> xrange object
 |  
 |  Like range(), but instead of returning a list, returns an object that
 |  generates the numbers in the range on demand.  For looping, this is 
 |  slightly faster than range() and more memory efficient.

AN object like xrange(10) implements the iterator protocol: it has a method __iter__ which returns an object with a __next__ method, so you can write

>>> r = xrange(10)
>>> it = iter(r)
>>> next(it)
0
>>> next(it)
1
>>> next(it)
2

# or
>>> for number in r: ...

but the list [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] is never built.
In python 3, range replaces xrange so that

python 2    |  python 3
------------------------
xrange(10)  |  range(10)
range(10)   |  list(range(10))

If you want a python 3 behavior in python 2, you can write

import sys
if sys.version_info < (3,):
    range = xrange

[Utopia_Tz]

Hi
The xrange is changed to range.
In 3.x range's function is similar xrange.
So just use range instead of xrange.

[Gribouillis]

Hi
The xrange is changed to range.
In 3.x range's function is similar xrange.
So just use range instead of xrange.

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