# ch15/example1.py

import sys

print(f'Reference count when direct-referencing: {sys.getrefcount([7])}.')

a = [7]
print(f'Reference count when referenced once: {sys.getrefcount(a)}.')

b = a
print(f'Reference count when referenced twice: {sys.getrefcount(a)}.')

###########################################################################

a[0] = 8
print(f'Variable a after a is changed: {a}.')
print(f'Variable b after a is changed: {b}.')

print('Finished.')