[Python tutorial] 8. Data type - Tuple

Tuples

• ordered (indexed)
• unchangeable
• allow duplicate values

thistuple = ("apple", "banana", "cherry", "apple", "cherry") # allow duplicate values

# Data Types: any data types
tuple1 = ("apple", "banana", "cherry")
tuple2 = (1, 5, 7, 9, 3)
tuple3 = (True, False, False)
tuple4 = ("abc", 34, True, 40, "male")

Create Tuple With One Item: (...,)

thistuple = ("apple",)

thistuple = ("apple") # NOT a tuple
print(type(thistuple))
<class 'str'>

Constructor: tuple((_,))

thistuple = tuple(("apple", "banana", "cherry"))

Access Tuple Items

thistuple = ("apple", "banana", "cherry", "orange", "kiwi", "melon", "mango")

# Indexing
print(thistuple[1]) # banana

# Negative Indexing
print(thistuple[-1]) # mango

# Range of Indexes
print(thistuple[2:5]) # ('cherry', 'orange', 'kiwi')
print(thistuple[:4]) # ('apple', 'banana', 'cherry', 'orange')
print(thistuple[2:]) # ('cherry', 'orange', 'kiwi', 'melon', 'mango')
print(thistuple[-4:-1]) # ('orange', 'kiwi', 'melon')

Check if Item Exists

if "apple" in thistuple:
  print("Yes, 'apple' is in the fruits tuple")

Update Tuples

Tuples are unchangeable

tuple -> list -> change item -> tuple

# Change Tuple Values
x = ("apple", "banana", "cherry")
y = list(x) # tuple -> list
y[1] = "kiwi" # change item
x = tuple(y) # list -> tuple

# Add Items
thistuple = ("apple", "banana", "cherry")
y = list(thistuple) # tuple -> list
y.append("orange") # append list
thistuple = tuple(y) # list -> tuple

# Remove Items
thistuple = ("apple", "banana", "cherry")
y = list(thistuple) # tuple -> list
y.remove("apple") # remove item
thistuple = tuple(y) # list -> tuple

Join Tuples

# +
thistuple = ("apple", "banana", "cherry")
y = ("orange",)
thistuple += y

Multiply Tuples: *

fruits = ("apple", "banana", "cherry")
mytuple = fruits * 2

del keyword

thistuple = ("apple", "banana", "cherry")
del thistuple

Unpack Tuples

fruits = ("apple", "banana", "cherry")
(green, yellow, red) = fruits # unpack

print(green)
print(yellow)
print(red)

apple
banana
cherry

Asterisk*

fruits = ("apple", "banana", "cherry", "strawberry", "raspberry")
(green, yellow, *red) = fruits # * list

print(green)
print(yellow)
print(red) # list

apple
banana
['cherry', 'strawberry', 'raspberry']

fruits = ("apple", "mango", "papaya", "pineapple", "cherry")
(green, *tropic, red) = fruits

print(green)
print(tropic)
print(red)

apple
['mango', 'papaya', 'pineapple']
cherry

Loop Tuples

thistuple = ("apple", "banana", "cherry")

# for loop
for x in thistuple:
  print(x)

# Index Numbers: range() & len()
for i in range(len(thistuple)):
  print(thistuple[i])

# While Loop
i = 0
while i < len(thistuple):
  print(thistuple[i])
  i = i + 1

Tuple Methods

Method	Description
count()	Returns the number of times a specified value occurs in a tuple
index()	Searches the tuple for a specified value and returns the position of where it was found