Python Interview Questions and Answers

1. What is Python?

Python is a high-level object oriented programming language that can run on different platforms like Windows, Linux, Unix, and Macintosh. Python is widely used in Data Science, Machine Learning, and Artificial Intelligence domain. Python enables ease of coding to develop applications.

2. What are the various applications of Python?

Python is used in multiple software domains and the applications are listed below. Various Types of application in Python is the commonly asked Python Interview questions.

Game development
Operating systems
Language development
Web and Internet Development
GUI based desktop applications
Scientific and computational applications
Image processing and graphic design applications
Enterprise and business applications development

3. List out the advantages of Python?

Interpreted: Python is an interpreted language. It does not require a prior accumulation of code and it executes instructions directly.

Free and open-source: It is an open-source project which is publicly available to use. It can be downloaded free of cost.

Portable: Python programs can run on various platforms without affecting its performance.

Extensible: It is highly flexible and extensible with any module.

Object oriented: Python permits to implement the Object-Oriented concepts to build an application solution.

Built-in data structure: List, Tuple, and Dictionary are useful integrated data structures that are provided by Python.

4. What is the difference between list and tuple?

The primary difference between list and tuple is that the list is mutable while tuple is not. Tuple could be hashed, for instance as a key for dictionaries.

5. What are Python decorators?

A Python decorator is a particular change that we make in Python syntax to alter its functions easily.

6. How are the arguments passed by value or by reference?

Everything in Python is an object and all the variables hold references to the objects. The reference values are placed according to the functions and you cannot change the value of the references. If needed you can change the objects if it has mutable features.

7. What is Dictionary and List comprehensions in Python?

These are the syntax constructions that are used in Python, created to ease the Dictionary or List based on the existing or current iterable.

8. What are the built-in types that Python provides?

Python provides two built-in types. They are Mutable and Immutable types of built-in types.

9. What is namespace in Python?

Name space in Python is the frequently asked questions in Python interview. In Python, every new name introduced has its place where it lives and can be hooked. It is called a namespace. It is like a box where a variable name is graphed to the object placed. Whenever the variable is searched out in the bar, this box will be searched, to get the related object.

10. What is lambda in Python?

It is a single expression, also an anonymous function predominantly used as an inline function.

11. What do you mean by the term pass in Python?

The term Pass meaning, a no-operation Python statement, or in other words, it means a place holder in a compound statement, where there should be a blank space left and nothing has to be filled there.

12. Why do lambda forms in python does not have statements?

The lambda form in Python does not have statements since it is used to make a new function object and return them at runtime.

13. What is a unit test in Python?

A unit testing framework in Python is known as a unit test. It supports the function like sharing of setups, shutdown code for tests, automation testing, aggregation of tests into collections etc.

14. What is slicing in Python?

A Mechanism to choose a range of items from sequence types like tuple, list, strings, etc. is called slicing.

15. What are the generators in Python?

The means of implementing iterators are called generators. It is a normal function in Python, except it yields expression in the functions.

16. What is docstring in Python?

The Python documentation string is called docstring, it is the means of documenting Python functions, modules and classes.

17. How do you copy an object in Python?

For copying an object in Python, you can try the code copy.copy () or copy.deepcopy() for the generic cases. You cannot copy all the objects but you can copy most of them.

18. What is a negative index in Python?

Python sequences could be indexed in positive and negative numbers. For instance, the Positive index, 0 is the first index, 1 is the second index and so on. For the Negative index, (-1) is the last index and (-2) is the second last index and so on.

19. Mention the rules for local and global variables in Python?

Local variables: When a variable is assigned to a new value anywhere within the function’s body, it’s deceived to be local variables.

Global variables: Variables that are referenced only inside a function are global variables.

20. Explain how to delete a file in Python?

We can delete a Python file by using a command like os.unlink(filename) or os. remove filename.

21. What is PEP 8?

PEP 8 is the coding convention, which is a set of recommendations, on how to write your Python code and make it more readable.

This is frequently asked questions in Python interview.

22. How Python is interpreted?

Python is an interpreted language and it runs directly from the source code. Python converts all the source code that is written by the developer to an intermediate language, that is again translated into machine language which has to be executed.

23. What is meant by Python literals?

Literals are also known as data that is given in a variable or constant. Python supports the following literals: String Literals, Numeric literals and Boolean Literals.

24. What does zip() function in Python?

The Python zip() function is used in transforming multiple lists, like list1, list2, list3, and many others into a single list of tuples. This method takes an iterable and returns a tuple of the iterable. When we don’t pass an iterable, it returns as an empty iterator. See this example:

list1 = [‘A’,’B’,’C’] and list2 = [20,50,60].

zip(list1, list2) # results in a list of tuples say [(‘A’,20),(‘B’,50),(‘C’,60)]

Note: In case the given lists are of various lengths, the zip stops generating tuples after the first list ends.

25. What is the swap case() function in Python?

It is the string’s function that converts all uppercase characters into lowercase and vice versa. It is used in altering the existing case of the string. These are the general Python related questions that are put forth to the candidates in the Python Interview Questions for freshers.

26. Why do we use the join () function in Python?

We use the join () function method to concatenate a string with the iterable object. It comes back to a new string that is the concatenation of the strings in iterable. This throws an exception TypeError if the iterable contains any non-string values.