tuples are immutable in python code example

Example: are tuples in python mutable

>>> dum = ('1861-10-23', ['poetry', 'pretend-fight'])
>>> dee = ('1861-10-23', ['poetry', 'pretend-fight'])
>>> dum == dee
True
>>> dum is dee
False
>>> id(dum), id(dee)
(4313018120, 4312991048)