Python Interview Questions

1.What is Python and why is it important?

Ans: Python is a high-level, interpreted, and general-purpose programming language. It is important because it is easy to learn, has a large community and many libraries, and is used in various fields such as data science, web development, and machine learning.

2.What is the difference between a tuple and a list in Python?

Ans: A tuple is an immutable and ordered collection of elements, while a list is a mutable and ordered collection of elements. Tuples are defined using parentheses, while lists are defined using square brackets.

3.What are the benefits of using Python?

Ans: Easy to learn and read, has a large community, a vast collection of libraries, supports multiple programming paradigms, used in a variety of fields such as web development, data science, and machine learning.

4.What is PEP 8 and why is it important?

Ans: PEP 8 is the Python style guide that provides guidelines for writing readable and maintainable code. It is important because it ensures that all code written in Python follows a consistent style, making it easier to read and maintain.

5.How do you define a function in Python?

Ans: A function in Python is defined using the "def" keyword followed by the function name and the function's inputs within parentheses. The code within the function is indented and ends with a return statement if a value is to be returned.

6.What is a decorator in Python?

Ans: A decorator in Python is a special type of function that can modify or extend the behavior of another function. Decorators are defined using the "@" symbol and are applied to functions using the "@" symbol followed by the decorator name.

7.What is the difference between deep and shallow copying in Python?

Ans: Shallow copying in Python creates a new object that points to the same objects as the original object. Deep copying creates a new object with a new memory location and a new set of objects, independent of the original object.

8.What is a module in Python?

Ans: A module in Python is a collection of functions and variables that can be imported into another Python script. Modules can be created using a .py file or by writing code in the built-in Python module named "module".

9.What is Python used for?

Ans: Python is a general-purpose programming language that can be used for a wide range of tasks, including web development, data analysis, machine learning, and scientific computing.

10.What is the difference between list and tuple in Python? 

Ans: Lists are mutable (can be changed), while tuples are immutable (cannot be changed). Lists use square brackets ([]), while tuples use parentheses (()).

11.What is a dictionary in Python? 

Ans: A dictionary in Python is an unordered collection of key-value pairs, where each key maps to a specific value. Dictionaries use curly braces ({}).

12.How do you check if a variable is an instance of a specific type in Python? 

Ans: You can use the is instance() function to check if a variable is an instance of a specific type in Python. For example: is instance(var, int).

13.How do you convert a string to a number in Python? 

Ans: To convert a string to a number in Python, you can use the int() or float() functions, depending on whether the string represents an integer or a floating-point number. For example: int("123") or float("3.14").

14.How do you sort a list in Python? 

Ans: You can use the sorted() function to sort a list in Python. For example: sorted([3, 1, 4, 1, 5, 9, 2, 6, 5, 3, 5]). You can also use the sort() method on a list object to sort the list in-place.

15.How do you reverse a string in Python? 

Ans: Using string slicing:

Python code:

def reverse_string(s):
return s[::-1]

This function takes a string s as input and returns a new string that is the reverse of the input string. The slice s[::-1] takes all characters of the string s, starting from the end and going to the start, with a step of -1.

16. How would you check if a number is a palindrome in Python?

Ans:

python code:

def is_palindrome(num):
return str(num) == str(num)[::-1]

This function takes a number num as input and returns True if it's a palindrome, and False otherwise. The function converts the number to a string, and then checks if the string is equal to its reverse by slicing.

17. How would you remove duplicates from a list in Python?

Ans:

python Code:

def remove_duplicates(1st):
return list(set(1st))

This function takes a list 1st as input and returns a new list with duplicates removed. The function converts the input list to a set, which does not allow duplicates, and then back to a list.