range with list

Using the list function we can tell the range object to generate the whole list immediately. Either using the variable that holds the range object, or wrapping the range() call in a list() call.

The sys module provides function called sys.getsizeof() that returns the size of a Python object in the memory. As you can see the size of the range object is 48 bytes while the size of the 3-element list is 112 bytes. It seems the range object uses less memory than even such a short lists. On the next page we'll see a more detailed analyzis.

import sys

rng = range(3, 9, 2)
numbers = list(rng)
print(rng)        # range(3, 9, 2)
print(numbers)    # [3, 5, 7]

others = list(range(2, 11, 3))
print(others)   # [2, 5, 8]

print(sys.getsizeof(rng))     # 48
print(sys.getsizeof(numbers)) # 112

• range
• list
• getsizeof