LC 263 / LING 398
Elsayed Issa
Fall 2024

Tuple Methods

Method	Meaning
index()	finds the first occurrence of a value.
count()	returns the number of times a value is in a tuple.

index(value)

• finds the first occurrence of a value. It takes one required argument (value).

thistuple = (1, 3, 7, 8, 7, 5, 4, 6, 8, 5)

x = thistuple.index(8)

print(x) 

3

count(value)

• returns the number of times a value is in a tuple.

• It takes one required argument (value).

thistuple = (1, 3, 7, 8, 7, 5, 4, 6, 8, 5)

x = thistuple.count(5)

print(x) 

2

Set Methods

Method	Meaning
add()	adds an element to the set.
update()	updates the current set, by adding items from another iterable.
pop()	removes a random item from the set.
remove()	removes a specified element from the set. It requires one argument (item).
discard()	removes the specified item from the set.
clear()	removes all elements in a set.
clear()	removes all elements in a set.

add(elmnt)

• adds an element to the set. It takes one required argument (the element we want to add)

colors = {"red", "blue", "green"}

colors.add("orange")

print(colors) 

{'red', 'green', 'blue', 'orange'}

update(iterable)

• updates the current set, by adding items from another any other iterable.

# notice: red is repeated but it will appear once in the new updated set
x = {"red", "blue", "green"}
y = {"brown", "red"}

x.update(y)

print(x)

{'brown', 'red', 'green', 'blue'}

pop()

• removes a random item from the set.

colors = {"red", "blue", "green"}

colors.pop()

print(colors) 

{'green', 'blue'}

remove(item)

• removes a specified element from the set. It requires one argument (item).

colors = {"red", "blue", "green"}

colors.remove("blue")

print(colors)

{'red', 'green'}

discard(value)

• removes the specified item from the set.

colors = {"red", "blue", "green"}

colors.discard("red")

print(colors) 

{'green', 'blue'}

clear()

• removes all elements in a set.

colors = {"red", "blue", "green"}

colors.clear()

print(colors) 

set()

Some other methods

union(set1, set2)

x = {"apple", "banana", "cherry"}
y = {"google", "microsoft", "apple"}

z = x.union(y)

print(z) 

intersection()

x = {"apple", "banana", "cherry"}
y = {"google", "microsoft", "apple"}

z = x.intersection(y)

print(z) 

difference()

x = {"apple", "banana", "cherry"}
y = {"google", "microsoft", "apple"}

z = x.difference(y)

print(z)