No Fluff Guide to Python - P6 - Tuple & Sets

Imagine you have a shopping list. You can write down all the things you need to buy, like milk, eggs, and bread.

A Python TUPLE is like a shopping list. You can store any kind of data in a list, like numbers, strings, and even other lists. But you CANNOT add and remove items from a list.

TUPLE

• A tuple is like a list
• but it is immutable. 
• means that you cannot change the items in a tuple. 
• Tuples are created using the ( ) parentheses. 
• example
• create a tuple with the items "milk", "eggs", and "bread":

shopping_tuple = ("milk", "eggs", "bread")

tuple = ("linux", "mac")
#Tuples are immutable

You can access the items in a tuple using the [ ] brackets. For example, the following code prints the first item in the tuple:

tuple1=("good",1,2,3,"morning")

print(tuple1[0])  
# accessing values using indexing

However, you cannot change the items in a tuple. For example, the following code will give an error:

Immutable: following code doesn't work

tuple[1]="change"  ❌
# a value cannot be changed as they are immutable

• Tuples are often used 
• when you need to store data that will not change
•  example
• store the names of the months of the year

 

tuple = ("linux", "mac")
#Tuples are immutable  

tuple2=("orange","grapes")
print(tuple1+tuple2)  
# tuples can be concatenated 

tuple1=(1,2,3,4)

tuple1.pop()    #tuple cannot be modified ❌
tuple1.append()  #tuple cannot be modified ❌

 

 

 

SET 

• Imagine you have a collection of unique toys. 
• You don't have any duplicates. 
• You can put all of your toys in a box and shake it up. 
• When you open the box
• the toys will be in a different order
• but you will still have the same number of toys.

• A Python set is like a box of unique toys
• You can store any kind of data in a set
• numbers, strings, and even other sets. 
• you cannot have any duplicates in a set.

To create a set, you use the {} curly braces.

set = {"linux", "mac"}
#Sets are mutable and have no duplicate elements 

set1={1,2,3,4,5, 5}
print(set1[0])   
#sets are unordered, so it doesnot support indexing

set2={3,7,1,6,1} 
# sets doesnot allow duplicate values
#-> 3,7,1,6 

set1={"water","air","food"}
set1.add("shelter")   
        # adds an element to the set at random position
print(set1)
set1.add("clothes")
print(set1)
set1.pop()  
        # removes random element from the set
print(set1)


#Output
#{'shelter', 'food', 'water', 'air'}
#{'shelter', 'food', 'air', 'water', 'clothes'}
#{'food', 'air', 'water', 'clothes'}