blah1.py

x = 1
y = x
x += 2
print("numbers:", x, y)
# numbers: 3 1

x = ("hello",)
y = x
x += ("world",)
print("tuples:", x, y)
# tuples: ('hello', 'world') ('hello',)

x = ["hello"]
y = x
x += ["world"]
print("lists:", x, y)
# lists: ['hello', 'world'] ['hello', 'world']


# Program output:
# numbers: 3 1
# tuples: ('hello', 'world') ('hello',)
# lists: ['hello', 'world'] ['hello', 'world']