"""
A tuple is a sequence of immutable Python objects. Tuples are sequences, just like lists. The main difference between the tuples and the lists is that the tuples cannot be changed unlike lists. Tuples use parentheses, whereas lists use square brackets.
"""
tup1 = ('physics','chemistry',1997,2000)
print(tup1)
tup1[0] = 0
print(tup1)