range vs xrange in Python

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examples/lists/xrange.py

from __future__ import print_function
import sys

r = range(1000)
x = xrange(1000)

for v in r:   # 0..999
    pass
for v in x:   # 0..999
    pass

print(sys.getsizeof(r))  # 8072
print(sys.getsizeof(x))  # 40

In Python 2 range creates a list of values range(from, to, step) and xrnage creates and iterator. In Python 3 range creates the iterator and if really necesary then list(range()) can create the list.

range vs. xrange in Python