Python developer Interview Questions
Last updated 3 January 2025
Whether you are preparing to interview a candidate or applying for a job, review our list of top Python developer interview questions and answers.
- How long have you been coding primarily in Python? See answer
- What are the main advantages of using Python? See answer
- How do you identify bugs in your code? See answer
- Tell us about the common mistakes developers make while using Python. See answer
- What is the difference between shallow and deep copy while using Python? See answer
- How do you keep track of your code versions? See answer
- What is your experience with multi threading? See answer
- Have you used Python in any of your personal projects? See answer
- How do you deal with disagreements with a team member while working on a project? See answer
- Why should we hire you as a Python developer? See answer
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How long have you been coding primarily in Python?
Developers utilise a variety of coding languages while working for different companies and projects. This question helps you to learn whether the candidate’s experience in Python is adequate for your company’s needs. What to look for in an answer:
- Extensive experience in Python
- They are comfortable with the language
- Passionate about developing in Python
Example:
While I began coding with Java, I have used Python for the last five years as it is a more efficient language to read and code. I also like that it is a versatile language that can operate on different systems.
What are the main advantages of using Python?
This question helps you to understand why the candidate has chosen to learn Python. You can determine whether they are the right fit for your company based on their coding style and level of proficiency. What to look for in an answer:
- Advanced knowledge of Python
- Practical application of Python’s strengths
- Coding style aligns with the company’s goals
Example:
The main advantage of Python is that it is more accessible and easier to learn for new developers. Python also has a much higher readability than other coding languages like Java or C++. Another reason for Python’s popularity is its flexibility. Whenever I encounter any problem while coding, I always have more than one tested way to resolve it.
How do you identify bugs in your code?
Python developers must be able to efficiently identify bugs in their code and resolve them immediately. This question helps you to evaluate the candidate’s troubleshooting and diagnostic abilities. What to look for in an answer:
- Problem-solving skills
- Proficiency in diagnostic tools
- Proven experience in bug fixing
Example:
As a developer, I am diligent in identifying and fixing bugs on a timely basis. I use PyChecker to search for bugs in the source code. PyChecker also recognises the complexity of the bug so that I can resolve it effectively.
Tell us about the common mistakes developers make while using Python.
An experienced Python Developer would be well-versed in the common mistakes they can make while using the language. This question helps you assess the candidate’s level of knowledge in Python. What to look for in an answer:
- Extensive experience in the language
- Candidate can handle coding mistakes
- Ability to avoid common mistakes
Example:
Most beginners make the mistake of using tabs instead of spaces. Often, developers forget to regularly run code analysis to identify errors like typos and undefined variables. There are other issues, like the use of generic identifiers, that are frustrating but easy to fix.
What is the difference between shallow and deep copy while using Python?
As an employer, you want to hire a Python developer with profound knowledge of the advanced aspects of the language. This question helps you to test whether the candidate is familiar with the different coding and programming features of Python language. What to look for in an answer:
- Advanced knowledge of Python
- Ability to explain complex concepts
- Practical experience in using shallow and deep copy within Python
Example:
Deep copy stores previously copied values. It does not copy any reference pointers to certain objects. Instead, it makes copies for each object that has been called and slows down program execution. However, shallow copies are used when a new instance type is created and keep the copy values in the new instance. Shallow copy has a much faster program execution as it does not make as many copies as a deep copy.
How do you keep track of your code versions?
This question is a great way to assess the candidate’s organisation skills so that you can hire a Python developer who is not only a great coder but also knows how to organise and maintain data properly. What to look for in an answer:
- General organisation skills
- Diligent in tracking code changes
- A systematic approach to version control
Example:
I believe that version control is essential for Python developers as it helps in keeping the track of the changes made to the base code and deal with bugs systematically. I save each version under its own file name so that it is easier to prevent and correct mistakes.
What is your experience with multi threading?
Python is designed with the intent to run a single thread at a time. If your organisation has a certain policy towards using multi threading workarounds, this question is a great way to check if the candidate’s coding preferences align with your company’s policy. What to look for in an answer:
- Understanding of Python’s relationship with multi threading
- Pros and cons of multi threading
- Coding style aligns with the company’s policy
Example:
I prefer not to use multi threading while coding in Python as it creates many potential problems. While it lets us access more than a single thread simultaneously, it also exponentially increases the pressure on the CPU and memory. Multi threading also makes the code more difficult to debug. These are some of the reasons why I avoid multi threading.
Have you used Python in any of your personal projects?
It helps to know if the candidate is interested in using Python beyond professional purposes. This question lets you learn if the candidate is passionate about Python and whether their skill set will benefit your company. What to look for an answer:
- Passion for coding in Python
- Innovation and creativity
- Versatile application of the language
Example:
I am quite fond of Python as a coding language, having created many websites using Python. I am also using Python to develop my second Android app, leveraging my experience and expertise while pushing my coding limits.
How do you deal with disagreements with a team member while working on a project?
This question will help you gauge if the candidate is a team player and possesses the necessary skills to communicate and collaborate with the rest of the coding team. Ideally, you would like to hire an employee who can effectively resolve disagreements and arguments while working with others to benefit your company. What to look for in an answer:
- Professionalism
- Communication and clarity
- Ability to resolve issues peacefully
Example:
In my first coding job at a startup company, I was part of a dedicated team who would work hard to achieve the company’s goals. However, one of my coworkers was not as dedicated, and I felt that I had to compensate for his lack of productivity. I communicated my misgivings to him, but ultimately I had to escalate the problem to my manager, who effectively conveyed the need for professionalism and dedication. After that, we collaborated to create an impressive product that satisfied our company’s needs.
Why should we hire you as a Python developer?
This question allows the candidate to explain their value as a prospective hire in a competitive job market with several qualified Python developers. The candidate should understand your organisation’s needs and express how their skill set will aid your company. What to look for in an answer:
- Honesty and confidence
- Understanding of company goals
- They should be aware of how their skills can help your company
Example:
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