50+ Frequently Asked Python Interview Questions

Here is a set of 50+ Frequently Asked Python Interview Questions most favourite questions of every interviewer while hiring for any software company. Follow up these:

 

1. What do you understand by “Python”?

Python is a high-level, interpreted, interactive and object-oriented scripting language. Python is designed to be highly readable. It uses English keywords frequently whereas other languages use punctuation, and it has fewer syntactical constructions than other languages.

 

2. Explain memory management in Python?

Python memory is managed by Python private heap space. All Python objects and data structures are located in a private heap. The programmer does not have access to this private heap and the interpreter takes care of this Python private heap.

 

4. How will you get to know the version of Python you are using?

The version property under the sys module will give the version of Python that we are using.

>>> import sys

>>> sys.version

 

5. Explain generator functions in Python?

Any function that contains at least one yield statement is called a generator function instead of a return statement. The difference between return and yield is, return statement terminates the function, and yield statement saving all its states pauses and later continues from there on successive calls.

 

6. How do you decide to choose between a list over a tuple?

When there is an immutable ordered list of elements we choose tuple. Because we cannot add/remove an element from the tuple. On the other hand, we can add elements to a list using append () or extend() or insert(), etc., and delete elements from a list using remove() or pop().

 

7. Determine the output of:

  1. def f(x,l=[]):
  2.     for i in range(x):
  3.         l.append(i*i)
  4.     print(l)
  5.  
  6. f(2)
  7. f(3,[3,2,1])
  8. f(3)

Output

  1. [0, 1]
  2. [3, 2, 1, 0, 1, 4]
  3. [0, 1, 0, 1, 4]

 

8. Explain the terms *args & **kwargs? And why would we use them?

Use *args when we aren’t sure how many arguments are going to be passed to a function, or if we want to pass a stored list or tuple of arguments to a function. **kwargs is used when we don’t know how many keyword arguments will be passed to a function, or it can be used to pass the values of a dictionary as keyword arguments. The identifiers *args and **kwargs are a convention.

 

9. What is Anonymous Function or Lambda Function?

A function which doesn’t contain any name is known as an anonymous function lambda function

Example:

myfunction=lambda x:x*x

a=myfunction(10)

print(a)

Output: 100

 

10. Is Python Supports for Data science and machine learning ?

a) Yes

 

11. What are datasciene and machine learning libraries in python ?  

a) Numpy, SciPy, Pandas, IPython, Scikit learn libraries

 

12. What are deeplearning libraries in python?

Tensorflow, Keras, Pytorch etc

 

13. What PEP 8 : Coding Style in Python ?

PEP 8, sometimes spelled PEP8 or PEP-8, is a document that provides guidelines and best practices on how to write Python code. It was written in 2001 by Guido van Rossum, Barry Warsaw, and Nick Coghlan. The primary focus of PEP 8 is to improve the readability and consistency of Python code.

PEP stands for Python Enhancement Proposal, and there are several of them. A PEP is a document that describes new features proposed for Python and documents aspects of Python, like design and style, for the community.

 

14.How can you do debugging in python ?

We can do by using inbuilt module pdb. The module pcb defines an interactive source code debugger for Python programs.

 

15. What are the tools available in python to find bugs ?

You can use Pychecker to find bugs in program.

 

16. What are major differences between from python 2 and python 3?

Print Syntax, Libraries, etc. Fore more information refer.

 

17. What are built in data types in python ?

Integers

Floating-Point

Numbers

Complex Numbers

Strings

 

18. How do we execute Python?

Python files first compile to bytecode. Then, the host executes them.

 

19. Explain Python’s parameter-passing mechanism.

To pass its parameters to a function, Python uses pass-by-reference. If you change a parameter within a function, the change reflects in the calling function. This is its default behavior. However, when we pass literal arguments like strings, numbers, or tuples, they pass by value. This is because they are immutable.

 

20. What is the with statement in Python?

The with statement in Python ensures that cleanup code is executed when working with unmanaged resources by encapsulating common preparation and cleanup tasks.
Consider you put some code in a try block, then in the finally block, you close any resources used. The with statement is like syntactic sugar for that.

The syntax of this control-flow structure is:

with expression [as variable]:
….with-block

  1. >>> with open(‘data.txt’) as data:

  • #processing statements

 

 

21. How is a .pyc file different from a .py file?

While both files hold bytecode, .pyc is the compiled version of a Python file. It has platform-independent bytecode. Hence, we can execute it on any platform that supports the .pyc format. Python automatically generates it to improve performance(in terms of load time, not speed).

Python OOPS Interview Questions and Answers

 

22. What makes Python object-oriented?

Again the frequently asked Python Interview Question

Python is object-oriented because it follows the Object-Oriented programming paradigm. This is a paradigm that revolves around classes and their instances (objects). With this kind of programming, we have the following features:

  • Encapsulation
  • Abstraction
  • Inheritance
  • Polymorphism
  • Data hiding

 

23. How many types of objects does Python support objects in python?

They are mutable and immutable. Let’s talk about these.

Immutable objects- Those which do not let us modify their contents. Examples of these will be tuples, booleans, strings, integers, floats, and complexes. Iterations on such objects are faster.

  1. >>> tuple=(1,2,4)

  • >>> tuple

(1, 2, 4)

  1. >>> 2+4j

(2+4j)

Mutable objects – Those that let you modify their contents. Examples of these are lists, sets, and dicts. Iterations on such objects are slower.

  1. >>> [2,4,9]

[2, 4, 9]

  1. >>> dict1={1:1,2:2}

  • >>> dict1

{1: 1, 2: 2}

While two equal immutable objects’ reference variables share the same address, it is possible to create two mutable objects with the same content.

 

24. How to convert string to float in Python?

To convert string to float in a python float is used before the string.

Ex: float (x) – X will be the string which will be converted into a floating point variable.

 

25. How will you reverse the list in Python?

To Reverse object of list in place list. reverses () statement is used.

 

26. What are the rules for global and local variable in python?

If a variable is assigned to a new value inside the function, then it is local and if a variable is defined outside a function then it is globally implicit.

 

27. What is a module in Python?

The module is simply a runnable code in python. It is a Python object with names, attributes that can be used for the purpose of bind and reference. The module can define variables, functions and classes.

 

28. What is scope in Python?

Scope is a region in Python program where it could be used without any qualification. i.e when the unqualified referenced with a name, then it can be looked out in the namespace to find the object.

 

29. What are Tuple in Python?

Tuples are enclosed within the parentheses. It is another sequence of data type that is similar to the list. The values of the tuples are separated by commas.

 

30. What is a package in Python?

A packages in Python can have sub folders and modules. The package is imported by using import package Statement.

Ex: import folder2.subfolder3.module2

 

31. Given the subclass of dictionary:

class DefaultDict(dict):

def __missing__(owned, key):

return []

 

32. Will the code below work? Explain why or why not?

d = DefaultDict()

d[‘plora’] = 156

Explanation:

Yes, it works. Because whenever the key is missing the dictionary instance, will be automatically be instantiated with a list.

 

33. How to perform unit testing in Python?

A unit testing framework called unittest is provided by Python. A unittest module in Python supports automation testing, shutdown code for tests and sharing of setup, independence of the tests from the reporting framework. and aggregation of tests into collections.

 

34.How to remove the last object from a list?

The below statement is used to remove and return the last object from the list

list.pop(obj=list[-1])

 

35. What is the purpose of continue statement in Python?

It causes to execute.

 

36. What is _init.py_ in Python?

_init.py_ is used to import a module in a directory which is called as package import. Usually init.py is an empty py file.

 

37. Explain Iterators in Python?

Several Iterators objects are defined in Python to support iteration over general and specific sequence types, dictionaries.

 

38. What does monkey patching mean in Python?

The term Monkey-patching refers only to dynamic modifications of a class or a module at run time. In other words, it refers to changing code sneakily at runtime..

 

39. Explain pass statement in Python?

It is used when a statement is required syntactically but you do not want any command or code

 

40. List the functional approach that Python is taking.

  • map
  • filter
  • reduce
  • lambda
  • list comprehension

 

41. What is meant by immutable type objects?

Immutable objects are defined as the objects whose content cannot be changed after the creation.

  • Tuple
  • Set
  • Float
  • Frozen
  • Str
  • Int

 

42. What is the syntax of the map?

The syntax of map in Python is given as

map(aFunction, aSequence)

 

43. List the mutable objects in Python?

Mutable object types can be changed after their creation.

  • List
  • Dict
  • Set
  • Byte array

 

44. Give the difference between del () and remove () methods of list?

The del () statement is used when you want to remove a exactly known list element and if the list element is unknown then the remove () statement will be used.

 

45. Name some of the special features of Python.
Following are some of the salient features of python

  • It supports functional and structured programming methods as well as OOP.
  • It can be used as a scripting language or can be compiled to byte-code for building large applications.
  • It provides very high-level dynamic data types and supports dynamic type checking.
  • It supports automatic garbage collection.
  • It can be easily integrated with C, C++, COM, ActiveX, CORBA, and Java.

 

46. Do you have any personal projects?

This shows that you are willing to do more than the bare minimum in terms of keeping your skill set up to date. If you work on personal projects and code outside of the workplace then employers are more likely to see you as an asset that will grow. Even if they don’t ask this question I find it’s useful to broach the subject.

 

47. Is python a case sensitive language?
Yes! Python is a case sensitive programming language.

 

48. What is the output of print str if str = ‘Hello World!’?
It will print the complete string. Output would be Hello World!

 

49. What is the output of print str[0] if str = ‘Hello World!’?

It will print the first character of the string. Output would be H.

50. What is the output of print str[2:5] if str = ‘Hello World!’?
It will print characters starting from 3rd to 5th. Output would be llo.

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