• range() (Python 3):
  • Returns an immutable sequence object.
  • Uses less memory for large ranges by generating numbers on the fly.
• range() (Python 2):
  • Returns a list of integers.
• xrange() (Python 2):
  • Returns an iterator that generates numbers on the fly (memory efficient).

Note:

In Python 3, xrange() was removed, and range() behaves like xrange() in Python 2.