What are list methods in python geeksforgeeks

Karida 181 Published: 08/23/2024

What are list methods in python geeksforgeeks

List Methods in Python: GeeksforGeeks

Python lists provide several built-in methods that can be used to manipulate and operate on lists. Here are some of the most commonly used list methods:

append(): This method adds an element to the end of the list.

Example:

    my_list = [1, 2, 3]

my_list.append(4)


print(my_list)  # Output: [1, 2, 3, 4]
extend(): This method adds multiple elements to the end of the list.

Example:

    my_list = [1, 2, 3]

my_list.extend([4, 5, 6])


print(my_list)  # Output: [1, 2, 3, 4, 5, 6]
insert(): This method inserts an element at a specified position in the list.

Example:

    my_list = [1, 2, 3]

my_list.insert(1, 10)


print(my_list)  # Output: [1, 10, 2, 3]
remove(): This method removes the first occurrence of an element from the list.

Example:

    my_list = [1, 2, 3, 2]

my_list.remove(2)


print(my_list)  # Output: [1, 3, 2]
sort(): This method sorts the elements of the list in ascending or descending order.

Example:

    my_list = [4, 2, 7, 1, 3]

my_list.sort()


print(my_list)  # Output: [1, 2, 3, 4, 7]
reverse(): This method reverses the elements of the list.

Example:

    my_list = [4, 2, 7, 1, 3]

my_list.reverse()


print(my_list)  # Output: [3, 1, 7, 2, 4]
pop(): This method removes and returns an element from the list at a specified position or the last occurrence of an element in the list.

Example:

    my_list = [1, 2, 3]

print(my_list.pop())  # Output: 3


print(my_list)  # Output: [1, 2]
index(): This method returns the index of the first occurrence of an element in the list.

Example:

    my_list = [1, 2, 3, 2]

print(my_list.index(2))  # Output: 1
count(): This method returns the number of occurrences of an element in the list.

Example:

    my_list = [1, 2, 3, 2]

print(my_list.count(2))  # Output: 2
clear(): This method removes all elements from the list.

Example:

    my_list = [1, 2, 3]

my_list.clear()


print(my_list)  # Output: []
copy(): This method returns a copy of the list.

Example:

    my_list = [1, 2, 3]

new_list = my_list.copy()


print(new_list)  # Output: [1, 2, 3]
popitem(): This method removes and returns an element from the list at a specified position or the last occurrence of an element in the list.

Example:

    my_list = [(1, 2), (3, 4), (5, 6)]

print(my_list.popitem())  # Output: ((5, 6),)


print(my_list)  # Output: [(1, 2), (3, 4)]

These are some of the most commonly used list methods in Python. There are many more, and each one has its own unique functionality.

What are the methods in Python?

I'd be happy to provide an answer in English! Here's a comprehensive overview of the methods in Python:

Methods: The Gateway to Object-Oriented Programming

In object-oriented programming (OOP), a method is a block of code that belongs to a class and performs a specific operation. In Python, methods are used to define behaviors for objects. A method can take arguments, modify instance variables, and even return values.

Types of Methods

There are several types of methods in Python:

Instance Method: These methods operate on the current object (instance) and use self as their first parameter. This is the most common type of method. Class Method: A class method operates on a class rather than an instance, and uses cls (short for "class") as its first parameter. Static Method: A static method doesn't operate on any object and can be called without creating an instance of the class.

Defining Methods

To define a method in Python, you use the def keyword followed by the method name and parentheses containing the parameters (if any). For example:

class Person:

def init(self, name):


self.name = name


def say_hello(self):


print(f"Hello, my name is {self.name}!")

In this example, we define an Person class with a constructor (__init__) and a say_hello method. The say_hello method takes no arguments (hence the empty parentheses) and prints a greeting message using the instance variable name.

Method Invocation

To call a method, you simply use dot notation (e.g., person.say_hello()) and pass in any required arguments:

person = Person("John")

person.say_hello()  # Output: Hello, my name is John!

In this example, we create an instance of the Person class with the name "John" and then call the say_hello method on that instance.

Method Overriding

Methods can be overridden in subclasses to provide a customized implementation. For example:

class Superhero(Person):

def say_hello(self):


super().say_hello()


print("I'm here to save the day!")


superhero = Superhero("Wonder Woman")


superhero.say_hello()  # Output: Hello, my name is Wonder Woman! I'm here to save the day!

In this example, we define a Superhero class that inherits from Person. We override the say_hello method to print an additional message. When we create an instance of Superhero and call say_hello, it first prints the greeting message from the parent class and then adds its own message.

Method Return Values

Methods can return values, which is useful for encapsulating logic and returning data:

class Calculator:

def add(self, x, y):


return x + y


calculator = Calculator()


result = calculator.add(2, 3)


print(result)  # Output: 5

In this example, we define a Calculator class with an add method that returns the sum of two numbers. We create an instance of Calculator, call the add method with arguments 2 and 3, and print the result.

This is just a taste of what you can do with methods in Python. With practice and experience, you'll become proficient in using them to build robust and maintainable code!

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