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Programming in Python

Basic List Operations

Explore basic list operations in Python such as updating, concatenation, cloning, and searching to handle and manipulate data structures efficiently. Understand key concepts like aliasing and identity to avoid common pitfalls and improve your programming skills in managing lists.

We'll cover the following...

Some basic list operations are given below.

Mutability

Unlike strings, lists are mutable (changeable). Lists can be updated, as shown below:

Python 3.8
animals = ['Zebra', 'Tiger', 'Lion', 'Jackal', 'Kangaroo']
ages = [25, 26, 25, 27, 26, 28, 25]
animals[2] ='Rhinoceros'
print(animals)
ages[5] = 31
print(ages)
ages[2:5] = [24, 25, 32] # sets items 2 to 4 with values 24, 25, 32
print(ages)
ages[2:5] = [ ] # delete items 2 to 4
print(ages)

Concatenation

One list can be concatenated (appended) at the end of another, as shown below:

Python 3.8
lst = [12, 15, 13, 23, 22, 16, 17]
lst = lst + [33, 44, 55]
print(lst) # prints [12, 15, 13, 23, 22, 16, 17, 33, 44, 55]

Merging

Two lists can be merged to create a new list, as shown below:

Python 3.8
s = [10, 20, 30]
t = [100, 200, 300]
z = s + t
print(z) # prints [10, 20, 30, 100, 200, 300]

Conversion

A string, tuple, or set can be converted into a list using the ...