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Python interview questions


There are several things that can go wrong while hiring a python developer: from relying heavily on the CV to not assessing the candidates on skills that are important to you. And with these multitude of things that can go wrong with the process, we thought we'll make this process a tad easier by providing a list of Python Interview Questions for experienced professionals.

How do you determine if he or she is, in fact, in the top one percent of candidates? Well, it’s easy if the goal is to just find someone who has simply listed Python on their resume. But if the goal is to find a great Python developer, then the challenge is difficult one.

Hiring a Python developer requires precise preparation and a careful approach, a well-defined and well-planned hiring process. This article has interview question for experienced python developers and some tips on how you could identify the best python developers.

So, lets get started with the Python technical screening questions: 

Python Interview Questions

When structuring your interview, spend time figuring out which questions you want to ask. Below is the list of some balanced coding and practical sample core python interview questions for experienced.

Read them, bookmark them, comment on them, or even contribute your own.

1. What will be the output of the code below in Python 2? Explain your answer.

def div1(x,y):

print "%s/%s = %s" % (x, y, x/y)

def div2(x,y):

print "%s//%s = %s" % (x, y, x//y)





Also, how would the answer differ in Python 3 (assuming, of course, that the above [print] statements were converted to Python 3 syntax)?

2. What are the key differences between Python 2 and 3?

3. What are some alternative implementations to C Python? When and why might you use them?

4. How does Python's garbage collection work?

5. What is the difference between range and xrange? How has this changed over time?

6. Here's a function (Provide a function). Optimise it for me.

7. What will be the output of the code below?

List = [‘a’, ‘b’, ‘c’, ‘d’, ‘e’]

print list [10:]

8. How does the GIL impact concurrency in Python? What kinds of applications does it impact more than others?

9. How do you iterate over a list and pull element indices at the same time?

10. How do you enforce ordering for a dictionary-style object?

11. How many ways can you append or concatenate strings? Which of these ways is fastest? Easiest to read?

12. What is PYTHON STARTUP and how is it used?

13. Write a code for downloading a CSV in Python 2 and Python 3. (Provide a link to CSV file)

14. I'm getting a maximum recursion depth error for a function. What does this mean? How can I mitigate the problem?

15. Here's a class hierarchy with some methods defined. When I call this function, what gets printed?

Apart from these technical questions, ask these following general questions to find out more about candidates Python skills

16. What’s your favourite standard library module?

17. Tell me something you don't like about Python.

18. What was the most interesting project you have participated in? Can you describe it and tell why you consider it to be so interesting?

19. Do you like to participate in the analysis, design and deployment phases of a project or do you prefer to concentrate on the pure development of well-described task? Why?

20. I have noticed you listed Skill X on your CV. What’s your opinion about it?

21. Do you remember any programming project decision you made that was a failure? Why do you think it was a mistake? Why did it happen? What did you learn from this experience?

22. What is the difference between list and tuples? 

23. Explain what Flask is and its benefits?

24. Is Django better than Flask?

25. Mention the differences between Django, Pyramid, and Flask.

26. Discuss Django architecture.

27. Explain how you can set up the Database in Django.

28. Give an example of how you can write a VIEW in Django?

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

30. What are Python namespaces? Why are they used?

31. What is Scope Resolution in Python?

32. What are Dict and List comprehensions?

33. What are common built-in data types in Python?

34. What is Lambda in Python? How is it used?

35. How do you copy an object in Python?

36. What are modules and packages? 

37. What is self in Python language? 

38. What is break, continue, and pass? 

39. What is the use of help() and dir() functions?

40. How are arguments passed by value and reference? 

41. What does *args and *kwargs mean? 

42. What are negative indexes and why are they used?

43. What type of language is Python? Scripting or Programming? 

44. What is PYTHONPATH?

45. Name the type conversions involved in this language. 

In addition to these Python Interview Questions, look whether the candidate stays up to date with the latest developments? Ask them questions related to trending technologies and updations. See if the candidate is active on Github? Ask them which blogs or industry leaders they follow? Do they contribute to any open source software projects? Do they help people on question answer forums? In short, how strong is their interest in python?

Moreover, you can try giving a task or project to the candidate with a real issue that you had encountered previously on your Python-focused software architecture problems.

When interviewing candidates, ask broad questions, remember it’s not always the correct answer the candidate gives, but the thought process and problem-solving skills he applies.

Lets move ahead, and

Look for the Important Python Skills Checklist

Python Interview Question for Experienced

There is no-where a complete list of skills that hiring managers might be looking for in a Python developer. But, these are the basic skills required for a Python developer.

Must have Skills

  • Core Python (I know this obvious but just to make it a quick checklist
  • Web frameworks (such as Django)
  • Object-relational mappers
  • Understanding of multi-process architecture
  • Understanding of how to use RESTful APIs
  • Should know how to build Python application

Nice to have Skills

  • Basic understanding of front-end technologies, such as JavaScript, HTML5, and CSS3
  • Database knowledge
  • Understanding of Systems administration and Script-writing
  • Other programming languages like Java or C++
  • Also understand the candidate’s communication skills, problem-solving and decision-making ability while assessing him for above skills.

So, these are some of the important skills which Python developers must have. But, apart from these, another easy way is to start screening candidates is with online skill assessment tests. 

Start with evaluating candidates with Python Online Tests

Before bringing in the candidates for the interview, make sure to assess the candidates with online python coding test. These skill tests will help you to determine the top one percent of python developers among the ones you were successful in attracting.

As an employer, you can easily evaluate candidate’s knowledge on various concepts, frameworks, and coding with this advanced python coding test for experienced.

These Simulation-based Python online tests prove to be the most reliable way of testing candidate’s python programming skills. Evaluate the knowledge of candidates and coding style with the assessments that are created by a team of Subject Matter Experts. These tests give balanced emphasis to both theory and coding questions.

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Just a two step process to Hire Python Developers that fit your needs

It is just a two step process after you source candidates.

First: Assess candidates with the python online coding test 

Second: Interview only those relevant candidates who passed the test

With python coding skills assessment, you will be 70 percent sure that the candidate is a good and competent python developer. Our online assessment platform has features like image proctoring, window violation, and powerful reports that give you a fair idea of the practical knowledge of the candidate. Now just to be 100 percent sure you need to conduct the last step, interview.

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Got a question?

We would love to hear more questions from you that you think are essential for evaluating Python developers. And, if you got a question, we’re all ears!

Nikita, iMocha
Nikita, iMocha
Content Writer at iMocha

Topics: Tech Recruitment, Skills Assessment

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