Python: Tuple

What is Tuple

Tuple is like a List , except that it cannot be changed.

• Items can be any type.
• Items need not be all the same type.
• Items cannot change
• Length cannot change.
• Access to any item is constant time.

Create Tuple by Literal Expression

()

Empty tuple.

(a,)

Tuple with 1 item a.

(a, b, c)

Tuple with item a, b, c.

a,

Tuple with 1 item a.

a, b, c

Tuple with item a, b, c.

Convert Iterable to Tuple

tuple(iterable)

Return a new tuple with items of iterable.

x = tuple([3, 4, 5])
y = 3, 4, 5

print(x)
# (3, 4, 5)

print(y)
# (3, 4, 5)

print(x == y)
# True

Tuple Cannot Change

Tuple cannot be changed, not item, and not length.

# tuple cannot be changed
xx = (3, 4, 5)
xx[0] = 9  # TypeError: 'tuple' object does not support item assignment

Nested Tuple and List

List and tuple can contain mixed datatypes, and nested in anyway.

# list and tuple can contain mixed datatypes, and nested in anyway

xx = [3, "4", [11, "12"], ("a", 2), 5]
yy = (3, "4", [11, "12"], ("a", 2), 5)