PYTHON INTERVIEW QUESTIONS AND ANSWERS

Python Programming is booming right now. Learning Python can give you a good salary hike and help you advance in your career. So before going into your next job interview, don’t forget to go through all these important python interview questions and answers that will help you.

Q1. What is the main difference between tuple and list data types?

The main difference is that lists are slower but they can be modified, while tuple works fast but cannot be modified.

Q2. Why is python gaining popularity?

It is very easy to learn for beginners because it has a simple syntax.

Python has excellent libraries which are very useful in Machine Learning and Data Science.

It is faster than any other programming language.

It is versatile. We can jump from the mobile application field to web designing or from machine learning to Data Science.

Q3. What are the data types in python?

There are 6 different data types:

String

Tuple

List

Dictionary

Number

Set

Q4. What is “Pickling” and “Unpickling” in python?

Pickling is the process by which python objects are converted to byte streams and Unpickling is the process by which a byte stream is converted into a python object.

Q5. What is the “lambda” function in Python?

In Python, lambda is an anonymous function i.e., function with no name. A lambda function can take any number of arguments but can only use one expression.

Q6. When do we use “pass” in python?

Empty code is not allowed in loops, class, or in if statements in any programming language so in Python, pass works as a placeholder for future code.

Q7. What is the difference between set and dictionary?

A set is an unordered, mutable, and iterable data type with unique elements, while a dictionary is an unordered, mutable, iterable data type with key: value pairs that hold unique key values.

Q8. Is python an interpreted language or compiled language?

Python is an interpreted language. It runs directly from the source code, with no intermediary step.

Q9. What is the difference between a compiled language and interpreted language?

In the compiled language, once the program is compiled it is expressed in the instructions of the target machine, while in interpreted language the instructions are not directly executed by the target machine.

Q10. What is monkey patching in python?

The term monkey patching refers to run-time modification of a class or module.

Q11. Does python have access specifiers?

Python uses single and double underscore as the access specifier. A single underscore is used before the name of the variable to make it protected and a double underscore is used before the name of a variable to make it private.

Q12. What does an object() do?

In Python, it returns an object that has no features and attributes. It is a base for all classes. It holds built-in properties which are default for all classes. It does not take any parameters.

Q13. What is the difference between python arrays and lists?

The only difference between array and list is that array can store only homogeneous data type elements whereas list can store heterogeneous data type elements.

Q14.What is PEP 8 and why is it important?

PEP is a Python Enhancement Proposal. PEP is an official design document providing information to the Python community for a new feature for Python or its processes.

Q15. What are decorators in Python?

Decorators are functions that add functionality to an existing function without changing the structure of the function itself. They are represented by the @decorator_name and are called in a bottom-up fashion.

Q16. How do you copy an object in Python?

In Python, the assignment operator does not work for copy objects. It only creates a binding between the existing object and the target variable. In this programming language, a copy module is used to create copies of an object.

Q17. What is the “self” keyword?

In python, self keyword is used to define an instance of a class. It is used as the first parameter. It helps in distinguishing between the attributes and methods of a class from its local variables.

Q18.What is __init__?

In Python, __init__ is a constructor method in Python. Whenever a new object is created, it is called automatically.

Q19. What is the difference between function and decorators in Python?

A function is a block of code that performs a specific task whereas a decorator is a function that modifies another function.

Q20. What is docstring?

A Python documentation string is a string literal specified in source code that is used as a comment to document a specific segment of code. It appears right after the definition of a class, method, or function.

Q20. What is docstring?

Q21. What is the difference between comment and docstring?

Comment: Comments help users to understand the program in a better way. They are completely ignored by the Interpreter. In Python, we use the hash symbol to write comments.

Docstring: In Python, docstring appears right after the definition of a class, method, or function. If we do not assign strings to any variable, they act as a comment. It is accessed by using __doc__ attributes.

Q22.What is help() and dir() functions?

In Python, help() is a useful built-in function that can be used to return the Python documentation of that particular object, attributes, data type, etc while dir() shows a list of attributes for that object passed in as an argument.

Q23. Q14.What is a dynamically typed language?

In dynamically typed language, we don’t need to declare the type of variable at the time of assigning a value to a variable.

Q24. How is memory managed in Python?

Memory management in Python is done by private heap space of Python. All Python data structures and objects are located in this private heap.

Q25.What are Python libraries?

Collection of Python packages is called a library. It is used to make the code easy for the programmer. Some of the libraries are-NumPy, Pandas, Scikit-learn, and many more.

Q26. What is unittest in Python?

A unit testing framework is known as unittest. It supports automation testing, aggregation of tests into collections, sharing of setups, etc.

Q27.What is slicing?

Slicing means obtaining a substring from the given string by slicing it from one index to another index.

Q28. What are generators in Python?

Python provides a generator to create our own iterator function. A generator is a function which does not return a single value, instead, it returns an iterator object with a sequence of values. In a generator function, yield statement is used instead of return statement.

Q29. What is the difference between xrange and range?

range(): range returns a Python list object. List takes space in the memory so it is slower than xrange().

xrange(): This function returns an xrange object. In xrange only a particular range is displayed on demand so it is faster than range().

Q30. What is module and package in Python?

Module is a way to structure a program. Every Python file is a module while the folder of Python programs is a package of modules. A package can have modules or subfolders.

This brings us to the end of the blog on the top python interview questions and answers. We hope that these python interview questions were helpful and you are now better equipped to attend your upcoming interview sessions. Happy learning, and good luck!