''' Purpose: consider parameter passing nuance in Python
'''

import tale

city1 = 'London'

city2 = 'Paris'

# attempt to switch value from city1 to city2, value from city2 to city1
tale.f( city1, city2 )
# this will NOT work

# city1 will still hold 'London' NOT 'Paris'
# city2 will still hold 'Paris' NOT 'London'
print( city1, city2 )
# so we print 'London Paris'