Home / Python interview questions. Part II. Middle

Python interview questions. Part II. Middle

Python interview questions. Part II. Middle

I am starting a series of posts about my own base of interviewing questions. Of course, it is not full and it doesn't have any answers and maybe some of the questions seem weird or even stupid, but I think they are good for finding the right candidate for Python position.


Questions

Q: What is the output: -12 % 10?

Q: What is the output: -12 // 10?

Q: What is the sequence of call operators in the expression a * b * c?

Q: What is the difference between Python 2 and 3?

Q: Why you shouldn't make the default argument to be an empty list?

Q: What id() function in Python is for?

Q: What is yield?

Q: What are iterators in Python?

Q: What are generators in Python? How are they different from iterators?

Q: How do you create a dictionary which can preserve the order of pairs?

Q: What is context managers? How are they different from try ... finally?

Q: What functions need to be redefined in class A in order for its instances to implement the context managers protocol?

Q: What is synchronous code? What is asynchronous code? How to write asynchronous code?

Q: What is unittest in Python?

Q: How can you copy an object in Python?

Q: How memory is managed in Python?

Q: How garbage collector works in Python? Describe Python's garbage collection mechanism in brief.

Q: How can you share global variables across modules?

Q: What is the attribute __slots__?

Q: What are metaclasses in Python?

Q: How to create a class without class statement?

Code involving questions

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 with 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 this code?

    def foo():
         from .module import *
         print(f'{bar()}')

Q: The file is located in /usr/lib/python/person.py. The program starts as python /usr/lib/python/person.py. What is the output?

    class Person:
        def __init__(self, name):
            __name__ = name
    
        def getAge(self):
            print(__name__)
    
    p = Person('John')
    p.getAge()

Q: Write timeit decorator for measure time of function execution.

Q: Write repeater decorator that will catch errors several times(customizable).

Q: What's the output?

    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: Add some code to make it work

    class Repeater:
        ...
    class RepeaterIterator:
        ...
    
    repeater = Repeater('Hello')
    for I in repeater:
        print (i)  # hello

Q: Write the code for getting unique values from list complex types.

Q: We have the following code with the unknown function f(). In f(), we do not want to use return, instead, we may want to use 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?

    x = [[0], [1]]
    print(len(' '.join(list(map(str, x)))))

Q: Write a program that prints the numbers from 1 to 20. But for multiples of three print “Fizz” instead of the number and for the multiples of five print “Buzz”. For numbers which are multiples of both three and five print “FizzBuzz”.

Q: Output? What is wrong? How to fix?

    class Developer(object):
        coffee_cups = 0
    
        def __init__(self, name):
            self.name = name
            self.coffee_cups += 1
    
        def speak(self):
    
            print("I'm %s and I've had %d cups of coffee today" % (self.name, self.coffee_cups))
    
    rover = Developer("Steve")
    spot = Developer("Bob")

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Python interview questions. Part I. Junior

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Python interview questions. Part III. Senior

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