Frequently Asked Python Interview Questions | iCert Global

Python is one of the top skills among programmers these days. On this Python interview question blog, I am going to show you some of the top Python interview questions for 2025.

Q1. How is a list different from a tuple in Python?

A list is a collection of things you can modify by inserting, deleting, or modifying them after you have created it. It is placed in square brackets like this: [1, 2, 3]. A tuple is a group of items put together, but once you make it, you can’t change it. It is placed in parentheses like this: (1, 2,  Therefore, the primary distinction is:

• Lists are mutable type (can be changed).

• Tuples cannot be modified; they are immutable.

Q2. What are the main characteristics of Python?

Python is a special kind of programming language referred to as an interpreted language. That is, you can execute your program without having it translated into another form, as opposed to some other programming languages.

In Python, you do not have to tell Python what type of data a variable will contain. For instance, you can initially assign x = 111 and later modify it to x = "I'm a string" without any problems. This is referred to as being dynamically typed.

Q3. Is Python a programming language or a scripting language?

Python is scriptable but is primarily a general-purpose programming language. That is, you can do lots of types of coding with it, rather than only little scripts.

Q4. What is meant by Python is an interpreted language?

An interpreted language executes code one line at a time, without first translating it to machine code. Python does this, so it is an interpreted language.

Q5. What is PEP 8?

PEP 8 is a guide that shows you how to write Python code in a readable and comprehensible way.

Q6. Some of the advantages of using Python?

• Python is simple to use, read, and learn.

• It runs the code one line at a time and stops if it finds a mistake.

• You don't need to inform Python how much data a variable holds; Python determines that automatically while running.

• Python is open and free for everyone to use.

Q7. What are Python namespaces?

A namespace is like a box that keeps the names of things like variables and functions. Python keeps these names and their places in memory.

 There are four kinds of namespaces:

• Built-in: Names provided by Python automatically.

• Global: Names declared in the top-level program.

• Enclosing: Names inside outer functions.

• Local: Names used in small functions.

Q8. What are Python decorators?

Decorators enable you to put additional functionality into a function without altering the function's code. You put the decorator in front of the function with the @ symbol.

Q9. What are the standard basic data types in Python?

• Numbers: They are integers (e.g., 1), decimal numbers (e.g., 7.9), or complex numbers (e.g., 3 + 4i).

• A list is a group of items arranged in a certain order. The items may be of different types. For instance, [5, 'market', 2.4].

• Tuple: A tuple is like a list. It is a group of items in a particular order, but you cannot modify it once you have created it. For instance, (3, 'tool', 1).

• String: A string is a collection of words or letters in single or double quotes, such as "Sana" or 'She is going to the market'.

• A set is a collection of different things, but they don’t follow any order. For instance, {7, 6, 8}.

• Dictionary: A dictionary is a collection of pairs of keys and values. You retrieve the value by the key. For example, {1: 'apple', 2: 'mango'}.

• Boolean: It has just two values — True or False.

Q10. How are .py files different from .pyc files?

• .py files are the Python code files that programmers write.
• .pyc files are special files made by Python when it runs the code. These files help the program run faster the next time..

Q11. What is Python slicing?

Slicing allows you to get a slice of a string, tuple, or list. You may slice as follows: [start:end:step].

• start is where you start (counting begins at zero).

• end is where you finish (but the final product is not counted).

• step is how many items you skip with each step. If you don't include step, it will take each item separately.

• Negative numbers are used to count from the end.

• If you have the list [1, 2, 3, 4, 5, 6, 7, 8], then [-1:2:2] is equivalent to beginning at the last element (8), going to the third element, and taking every second element. This results in [8, 6, 4].

Q12. What are Python Literals? Enumerate the different types.

A literal is a value written right in the code. It is a fixed value that never changes.

There are 5 types of literals in Python:

• String literals: Phrases or sentences placed in quotes. Example: name = "Tanya"

• Character literal: One letter in quotation marks. For instance: a = 't'

• Numeric literals: Whole numbers, decimals, or complex numbers. e.g., a = 50

• Boolean literals: True or False.

• Literal collections: Sets of values like:

• List: [1, 2, 3, 'Amit']

• Tuple: (5, 6, 7, 8)

• Dictionary: {1: 'apple', 2: 'mango', 3: 'banana'}

• Set: {'Rohit', 'Mohan', 'Tanya'}

• There is also a special term called None, which refers to no value or null.

Q13. What modifications have been implemented in Python 3.9?

Some new things in Python 3.9 are:

• New approaches to merger and updating dictionaries with | and |=

• New ways to remove parts from the beginning or end of a string.

Q14. How does memory handling occur in Python?

Python manages memory in a special area called private heap space in which Python data and objects get stored. The programmer can’t directly use the heap space — Python takes care of it on its own.

Q15. What is a namespace in Python?

A namespace is an environment that maintains names unique so that there is no confusion. It makes sure that each name (variable or function names) is unique and understandable.

Q16. What is PYTHONPATH?

PYTHONPATH is a special system variable used by Python to find the files (modules) you require. Python searches in the paths specified in PYTHONPATH when you import a module.

Q17. What are Python modules? List some of the built-in modules.

A Python module is a Python file. It can be made up of functions, classes, or variables. It has the .py extension.

Q18. What are local and global variables in Python?

• Global variables are made outside any function and can be used anywhere in the program.
• Local variables are made inside a function and can only be used inside that function.

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Conclusion

This post talks about important Python questions to help you prepare for interviews confidently. Solving these basic and advanced questions will improve your coding abilities. Practice regularly, and you will be ready to do well in your Python interview!

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