🐍2.5what is list ?

 In a Python interview, you may be asked about lists, as they are one of the most commonly used data structures in Python. Here’s how you can explain Python lists clearly and concisely:

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In an interview, you can define a Python list concisely and clearly. Here's a structured way to answer:

What is a List in Python?

A list in Python is an ordered, mutable (changeable), and heterogeneous collection that can store multiple elements in a single variable. Lists allow duplicate values and can contain different data types, such as integers, strings, floats, and even other lists.

Key Features of Lists:

1. Ordered – Elements maintain the sequence in which they are inserted.
2. Mutable – You can modify elements by adding, removing, or updating values.
3. Heterogeneous – Lists can contain different data types.
4. Allows Duplicates – The same value can appear multiple times.
5. Dynamic Size – Lists can grow or shrink as needed.

Example of Creating a List:

my_list = [1, "hello", 3.5, [2, 4, 6]]

Commonly Asked Interview Questions on Lists:

1. What is the difference between a list and a tuple?

   • Lists are mutable, while tuples are immutable.

2. How do you remove duplicates from a list?

   my_list = [1, 2, 2, 3, 4, 4]
   unique_list = list(set(my_list))
   print(unique_list)  # Output: [1, 2, 3, 4]
   

3. How do you reverse a list?

   my_list[::-1]  # Using slicing  
   my_list.reverse()  # Using built-in method  
   

4. What are some important list methods?

Method	Example	Explanation
append()	list.append(6)	Adds an element at the end. Add only single character.
extend()	list.extend([7, 8])	Adds multiple elements to the list.Adds all elements of an iterable (list, tuple, etc.)
insert()	list.insert(2, "new")	Inserts an element at a specific index.
remove()	list.remove(3)	Removes the first occurrence of a value.
pop()	list.pop(1)	Removes and returns an element by index.
index()	list.index(4)	Returns the index of the first occurrence of a value.
count()	list.count(2)	Counts occurrences of a value.
sort()	list.sort()	Sorts the list in ascending order.
reverse()	list.reverse()	Reverses the list in place.
copy()	new_list = list.copy()	Returns a shallow copy of the list.
clear()	list.clear()	Removes all elements from the list.

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