I'm starting a series of posts about my own database of interview questions. Of course, it's not complete and there are no answers, and some questions may seem strange or even silly, but I think they're good for finding the right Python candidate for the job.
- Python interview questions. Part I. Junior
- Python interview questions. Part II. Middle
- Python interview questions. Part III. Senior
Questions
Q: What is the output of -12 % 10?
Q: What is the output of -12 // 10?
Q: What is the sequence of call operators in the expression a * b * c?
Q: Why shouldn't you make the default arguments an empty list?
Q: What id() function in Python is for?
Q: What is the yield keyword used for in Python?
Q: What is an iterator in Python? Can you write an example?
Q: What is a generator in Python? How are they different from iterators?
Q: What is the difference between __iter__ and __next__?
Q: How do you create a dictionary which can preserve the order of pairs?
Q: What is a context manager? How are they different from try ... finally?
Q: Which functions must be overridden in a class in order for its instances to implement the context manager protocol?
Q: What is the synchronous code? What is asynchronous code? How to write asynchronous code?
Q: What is unittest module in Python? How to write tests in Python?
Q: What is type checking? Why Python is a strongly typed language? Do we have types in Python?
Q: How can you copy an object in Python? How to make a deep copy?
Q: How memory is managed in Python? Why garbage collector exists in Python?
Q: How the garbage collector works in Python? Describe Python's garbage collection mechanism in brief.
Q: How can you share global variables across modules? Is it a good idea to do that?
Q: What is the __slots__ attribute used in a class for?
Q: What are metaclasses in Python?
Q: How to create a class without a class statement?
Code involving questions
Q: How to check that one tuple contains all elements of another tuple?
Q: What will be the output of the following code?
>>> list = ['a', 'b', 'c', 'd', 'e']
>>> print(list[10:]) # []
Q: How can I reload a previously imported module? (we assume that the module is a file module.py)
Q: What will be the output of the following code?
>>> a = [[]]*3
>>> a[1].append(1)
>>> print(a) # [[1], [1], [1]]
Q: What's wrong with the following code?
def foo():
from .module import *
print(f"{bar()}")
Q: The file is located in /usr/lib/python/person.py. The program is run with python /usr/lib/python/person.py. What will the output be?
class Person:
def __init__(self, name):
__name__ = name
def getAge(self):
print(__name__)
p = Person("John")
p.getAge()
Q: Write a timeit decorator to measure the time of function execution.
Q: Write a decorator that will catch errors and repeat the function a maximum of 3 times (configurable).
Q: What's the output of the following code?
class parent:
def __init__(self, param):
self.v1 = param
class child:
def __init__(self, param):
self.v2 = param
obj = child(11)
print(obj.v1 + " " + obj.v2)
Q: Fix the following code to make it work.
class Repeater:
...
class RepeaterIterator:
...
repeater = Repeater("Hello")
for i in repeater:
print(i) # hello
Q: Write code to get unique values from a list of complex types (custom classes). Example: [A(1, "ab"), A(2, "ab"), A(2, "aa"), A(1, "ab)] -> [A(1, "ab"), A(2, "ab"), A(2, "aa")].
Q: We have the following code with the unknown function f(). In f(), we do not want to use a return, instead, we may want to use a generator.
for x in f(5):
print(x,)
The output looks like this:
0 1 8 27 64
Write a function f() so that we can have the output above.
Q: What's the output of the following code?
x = [[0], [1]]
print(len(' '.join(list(map(str, x)))))
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