40 interview questions on Python for developers (2026)

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nested lists

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list comprehension

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Antoine Brennerat Dec 2, 2021

40 interview questions on Pythonfor developers (2026)

Test your technical skills before an interview of Python with 40 corrected questions. Beginner, Intermediate or Expert level.

40 interview questions on Pythonfor developers (2026)

Test your technical skills before an interview of Python with 40 corrected questions. Beginner, Intermediate or Expert level.

Why is the output of the following code undefined? ``` def f(n): return n + 1 f(n) ```

Write a Python program to open a file in binary mode and write a string to it.

What is the output of the following code? ``` import asyncio async def read_data(): with open('data.txt', 'r') as f: data = f.read() return data async def main(): data = await read_data() print(data) if __name__ == '__main__': asyncio.run(main()) ```

In Python, what is the output of the following code? `valueA = 10; valueB = 10; valueA is valueB`

Create a list of 10 elements in Python

Change the value of a nested list element in Python

Write a Python function that returns a list of the first n numbers of the Fibonacci sequence.

What is the output of the following Python code? ``` G = '123' print(G + 1) ```

Write a Python code that will wait for 40 seconds.

Python: Decorator that prevents the creation of an instance of a class

Write a Python function that returns a copy of anotherlist with number appended to the end.

In Python, which of the following statements are true about the keyword 'with':

Write a Python class with a method that takes two arguments.

Explain the use of super in Python

Write a Python function that returns the sum of the first n integers.

What is the output of the following code? ``` print("\u0041") ```

Define a class method in Python

What is the output of the following code? ``` def f(x): if x == 0: return 1 else: return f(x - 1) + f(x - 2) print(f(3)) ```

What is the value of valueA after the following code is executed? ``` valueA = 10 valueB = 20 valueA = valueB ```

Write a Python code that returns the first element of a list if the list is not empty, otherwise return None.

What is the output of the following code? ``` import asyncio async def read_data(): with open('data.txt', 'r') as f: data = f.read() return data async def main(): data = await read_data() print(data) if name == 'main': asyncio.run(main()) ```