Introduction

Tuples are immutable lists.

 >>> my_tuple = (1,2,3)
 >>> my_tuple
 (1,2,3)

Parentheses are not what makes a tuple a tuple, it’s the commas.

 >>> my_2nd_tuple = 1,2,3
 >>> my_2nd_tuple
 (1,2,3)

tuple( ) function

 >>> my_3rd_tuple = tuple( [1,2,3] )
 >>> my_3rd_tuple
 (1,2,3)

Tuples are immutable!

 >>> my_3rd_tuple[1]
 2
 >>> my_3rd_tuple[1] = 5
 TypeError!

Packing & Unpacking

Simultaneous assignment is actually a tuple of values being assigned to another tuple.

 >>> a, b = 1, 2
 >>> a
 1
 >>> b
 2

Unpacking

 >>> c = (3,4)
 >>> c
 (3,4)
 >>> d, e = c
 >>> d
 3
 >>> e
 4

Packing

 >>> f = d, e
 >>> f
 (3, 4)
 >> f == c
 True

Swapping

 >>> del a
 >>> del b
 >>> a = 1
 >>> b = 2
 >>> a, b = b, a
 >>> a
 1
 >>> b
 2

EXERCISE

The following is a function that takes a String and returns 4 versions of it in a tuple: uppercased, lowercased, capitalized and reversed.

def stringcases(my_string):
  return my_string.upper(), my_string.lower(), my_string.title(), my_string[-1::-1]