Python Developer

40+ Python Developer Interview Questions and Answers for Freshers

Updated 22 Oct 2024

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Q1. How to convert the .txt file into .csv file in python

Ans.

To convert a .txt file into a .csv file in Python, you can use the csv module.

  • Import the csv module

  • Open the .txt file in read mode

  • Open a new .csv file in write mode

  • Use csv.reader to read the .txt file line by line

  • Use csv.writer to write each line to the .csv file

Q2. 6.What are local variables and global variables in Python? 7.When to use a tuple vs list vs dictionary in Python? 8.Explain some benefits of Python 9.What is Lambda Functions in Python? 10.What is a Negative In...

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Ans.

Local variables are variables that are defined within a function and can only be accessed within that function. Global variables are variables that are defined outside of any function and can be accessed throughout the program.

  • Local variables are created when a function is called and destroyed when the function completes.

  • Global variables can be accessed and modified by any function in the program.

  • Using local variables helps in encapsulation and prevents naming conflicts.

  • Globa...read more

Q3. What is the definition between python Arrays and list

Ans.

Arrays are homogeneous data structures while lists are heterogeneous data structures in Python.

  • Arrays are fixed in size while lists are dynamic.

  • Arrays can only contain elements of the same data type while lists can contain elements of different data types.

  • Arrays are faster and more memory-efficient for numerical operations.

  • Lists have more built-in functions and are more versatile for general-purpose programming.

  • Example of array: import array as arr; a = arr.array('i', [1, 2, ...read more

Q4. If we decide to change the domain we should make our-self free for 3-6 months for earning knowledge on the domain. Then only it will reach our goals perfect

Ans.

Agree, taking time to learn the new domain is crucial for success.

  • Learning the new domain will help us understand the business requirements better.

  • It will also help us identify potential challenges and opportunities.

  • We can leverage our existing skills and knowledge to build better solutions.

  • Taking time to learn the new domain will also help us build credibility with stakeholders.

  • We can use this time to network and build relationships with experts in the new domain.

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Q5. define class and functions.why functions are written inside class.what is the role of a class

Ans.

A class is a blueprint for creating objects that have properties and methods. Functions are written inside a class to define its behavior.

  • A class is a user-defined data type that encapsulates data and functions that operate on that data.

  • Functions written inside a class are called methods and are used to define the behavior of the class.

  • The role of a class is to provide a template for creating objects that share common properties and behavior.

  • Classes allow for code reusability...read more

Q6. What is the difference between list and tuples in python?

Ans.

Lists are mutable while tuples are immutable in Python.

  • Lists use square brackets [] while tuples use parentheses ().

  • Elements in a list can be added, removed, or modified while tuples cannot be modified.

  • Lists are used for collections of homogeneous items while tuples are used for heterogeneous items.

  • Lists are generally used for large collections of data while tuples are used for smaller collections or for data that should not be changed.

  • Lists are slower than tuples in terms of...read more

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Q7. 11.What is the namespace in Python? 12.What is a dictionary in Python? 13.What is type conversion in Python? 14.What is the difference between Python Arrays and lists? 15.What are functions in Python?

Ans.

Answers to common Python interview questions.

  • Namespace is a container for storing variables and functions.

  • Dictionary is a collection of key-value pairs.

  • Type conversion is the process of converting one data type to another.

  • Arrays are homogeneous while lists are heterogeneous.

  • Functions are blocks of code that perform a specific task.

Q8. 1. What is Python? 2. What Are Python Advantages? 3. Why do you we use in python Function? 4. What is the break Statement? 5. What is tuple in python?

Ans.

Python is a high-level, interpreted programming language known for its simplicity, readability, and versatility.

  • Python is used for web development, data analysis, artificial intelligence, and more.

  • Advantages of Python include its ease of use, large standard library, and community support.

  • Functions in Python are used to group related code and make it reusable.

  • The break statement is used to exit a loop prematurely.

  • A tuple is an ordered, immutable collection of elements.

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Q9. What is python

Ans.

Python is a high-level programming language known for its simplicity and readability.

  • Python is an interpreted language, which means it does not need to be compiled before running.

  • It has a large standard library that provides many useful modules and functions.

  • Python supports multiple programming paradigms, including procedural, object-oriented, and functional programming.

  • It is widely used in web development, data analysis, artificial intelligence, and scientific computing.

  • Pyth...read more

Frequently asked in,

Q10. What's the difference between tester and developer

Ans.

Testers focus on finding defects while developers focus on creating software.

  • Testers are responsible for testing the software and finding defects.

  • Developers are responsible for creating the software and fixing defects.

  • Testers use test cases and scenarios to ensure the software meets requirements.

  • Developers use programming languages and tools to create software.

  • Testers work closely with developers to ensure defects are fixed.

  • Developers work closely with testers to understand a...read more

Q11. What is the difference between list ans tuple?

Ans.

Lists are mutable while tuples are immutable.

  • Lists are enclosed in square brackets [], while tuples are enclosed in parentheses ().

  • Elements in a list can be added, removed or modified, while elements in a tuple cannot be modified.

  • Lists are used for collections of homogeneous items, while tuples are used for collections of heterogeneous items.

  • Lists are generally used for sequences that need to be modified frequently, while tuples are used for sequences that are accessed freque...read more

Q12. which is muteable in python? (list,tuple,string,int,float)

Ans.

Lists are mutable in Python.

  • Lists can be modified after creation, allowing for addition, removal, and modification of elements.

  • Tuples, strings, integers, and floats are immutable in Python.

  • Example: list_example = [1, 2, 3]; list_example[1] = 5 # modifies the list element at index 1 to 5.

Q13. Design a CRUD App which supports AYSNC and AWAIT Operations in Fast API

Ans.

Design a CRUD App with AYSNC and AWAIT Operations in Fast API

  • Use FastAPI framework for building the CRUD operations

  • Implement async and await keywords for asynchronous operations

  • Utilize SQLAlchemy for database operations

  • Include endpoints for Create, Read, Update, and Delete operations

Q14. What is lambda functions is python

Ans.

Lambda functions are anonymous functions that can be defined in a single line of code.

  • Lambda functions are defined using the lambda keyword.

  • They can take any number of arguments, but can only have one expression.

  • They are often used as arguments for higher-order functions.

  • Example: lambda x: x**2 defines a lambda function that squares its input.

Q15. how to build our-self for technology needs?

Ans.

To build ourselves for technology needs, we need to constantly learn and adapt to new technologies and trends.

  • Stay updated with the latest technologies and trends in the industry

  • Attend conferences, workshops, and webinars to learn new skills

  • Practice coding regularly and work on personal projects to improve skills

  • Collaborate with other developers and participate in open source projects

  • Read blogs, articles, and books related to technology

  • Be open to learning new programming lang...read more

Q16. how to reverese a dictionary in python

Ans.

Reverse a dictionary in Python

  • Create a new dictionary with values as keys and keys as values

  • Use dictionary comprehension to create the new dictionary

  • If there are duplicate values, use a list comprehension to create a list of keys

  • Use the built-in function 'reversed' to reverse the order of the keys or values

Q17. What is reang

Ans.

reang is not a recognized term in Python development.

  • reang is not a Python keyword, module, or function.

  • There is no known reference or documentation for reang in Python.

  • It is possible that reang is a typo or a mispronunciation of another term.

Q18. What is while loop

Ans.

A while loop is a control flow statement that allows code to be executed repeatedly based on a condition.

  • The loop continues until the condition becomes false

  • The condition is checked before each iteration

  • The loop body must include a way to modify the condition to avoid an infinite loop

Q19. What is python programminv language

Ans.

Python is a high-level programming language known for its simplicity and readability.

  • Python is an interpreted language, meaning it does not need to be compiled before running.

  • It has a large standard library that provides many pre-built functions and modules.

  • Python supports multiple programming paradigms, including procedural, object-oriented, and functional programming.

  • It is widely used in web development, data analysis, artificial intelligence, and scientific computing.

  • Pytho...read more

Q20. What is a set in python?

Ans.

A set is an unordered collection of unique elements in Python.

  • Sets are created using curly braces or the set() function.

  • Sets do not allow duplicate elements.

  • Sets can perform mathematical operations like union, intersection, difference, and symmetric difference.

  • Sets are mutable, meaning you can add or remove elements from a set.

  • Sets are useful for removing duplicates from a list or checking for membership of an element.

Q21. How many keywords are python?

Ans.

Python has 35 keywords.

  • Python has a set of reserved words that cannot be used as variable names or identifiers.

  • These keywords are used to define the syntax and structure of the Python language.

  • Examples of Python keywords include 'if', 'else', 'for', 'while', 'def', 'class', 'import', etc.

Q22. List and tuple difference

Ans.

Lists and tuples are both sequence data types in Python, but they have some key differences.

  • Lists are mutable, meaning their elements can be changed, added, or removed, while tuples are immutable.

  • Lists are defined using square brackets [], while tuples are defined using parentheses ().

  • Lists are typically used for collections of similar items, while tuples are used for heterogeneous data.

  • Lists have more built-in methods for manipulation, such as append(), extend(), and remove(...read more

Q23. Can we change the domain ?

Ans.

Yes, we can change the domain by updating the DNS records and configuring the web server accordingly.

  • Update the DNS records to point to the new domain

  • Configure the web server to recognize the new domain

  • Redirect the old domain to the new domain to avoid broken links

  • Update any links or references to the old domain in the codebase

Q24. Nothing to worry Do you oopa concept? Do you know python?

Ans.

Yes, I am familiar with object-oriented programming concepts and have experience with Python.

  • Yes, I am familiar with object-oriented programming concepts such as classes, objects, inheritance, and polymorphism.

  • I have experience using Python for various projects and tasks.

  • I understand the principles of encapsulation, abstraction, and inheritance in Python.

Q25. What is python benefits?

Ans.

Python benefits include simplicity, versatility, and a large community support.

  • Python is easy to learn and read, making it a great language for beginners.

  • Python has a wide range of applications, from web development to data analysis and machine learning.

  • Python has a large and active community, providing extensive documentation, libraries, and frameworks.

  • Python's simplicity and readability contribute to faster development and easier maintenance of code.

  • Python supports multiple...read more

Q26. what is a suite in python

Ans.

A suite in Python is a group of statements that are executed together as a single block.

  • Suites are used in control structures like if, while, for, etc.

  • Suites are defined by their indentation level.

  • Suites can contain one or more statements.

  • Suites can also be empty.

Q27. Why python is used in reality

Ans.

Python is used in reality due to its simplicity, versatility, and wide range of applications.

  • Python is easy to learn and read, making it a popular choice for beginners.

  • It has a large standard library and many third-party modules, allowing for rapid development.

  • Python is used in web development, data analysis, machine learning, scientific computing, and more.

  • It is cross-platform and can run on various operating systems.

  • Python is also used in automation, scripting, and testing....read more

Q28. What is for loop

Ans.

A for loop is a control flow statement that iterates over a sequence of elements and executes a block of code for each element.

  • A for loop is used to iterate over a sequence such as a list, tuple, or string.

  • It consists of an initialization, condition, and increment/decrement statement.

  • The loop continues until the condition is false.

  • The code block inside the loop is executed for each element in the sequence.

  • Example: for item in my_list: print(item)

Q29. What is nested loop

Ans.

A nested loop is a loop inside another loop. It allows iterating over multiple levels of data structures.

  • Nested loops are used when we need to perform repetitive tasks within repetitive tasks.

  • The inner loop is executed for each iteration of the outer loop.

  • Nested loops can be used to iterate over multi-dimensional arrays or nested data structures.

  • Example: Printing a multiplication table using nested loops.

Q30. Decorators in Python

Ans.

Decorators in Python are a way to modify the behavior of a function or class without changing its source code.

  • Decorators are defined using the @ symbol followed by the decorator name.

  • They can be used to add functionality to existing functions or classes.

  • Decorators can be used for logging, timing, authentication, etc.

  • They can also be stacked to apply multiple decorators to a single function or class.

  • Example: @staticmethod, @classmethod, @property are built-in decorators in Pyt...read more

Q31. What is data type

Ans.

Data type is a classification of data based on the type of value it holds.

  • Data type determines the operations that can be performed on the data

  • Examples of data types include integers, strings, booleans, and floats

  • Data types can be static or dynamic depending on the programming language

Q32. What is keyword

Ans.

A keyword is a reserved word in a programming language that has a specific meaning and cannot be used as a variable name.

  • Keywords are used to define the syntax and structure of a programming language.

  • They cannot be used as variable names or identifiers.

  • Examples of keywords in Python include 'if', 'else', 'for', 'while', 'def', 'class', and 'import'.

Q33. What is ORM and which orm you used

Ans.

ORM stands for Object-Relational Mapping, a technique to map objects from an application to tables in a relational database.

  • ORM helps developers interact with databases using objects instead of SQL queries

  • Popular ORMs include SQLAlchemy for Python, Django ORM for Django framework

  • ORMs provide features like data validation, relationship management, and query optimization

Q34. Explain the key Features of python

Ans.

Python is a high-level, interpreted programming language known for its simplicity and ease of use.

  • Dynamic typing and automatic memory management

  • Support for multiple programming paradigms such as procedural, object-oriented, and functional programming

  • Extensive standard library with modules for a wide range of tasks

  • Cross-platform compatibility

  • Easy to learn and read syntax

  • Large and active community with a wealth of resources and support

  • Used in a variety of applications such as w...read more

Q35. What is pep?

Ans.

PEP stands for Python Enhancement Proposal, which is a design document providing information or describing a new feature for Python.

  • PEP is used to propose and discuss new features or changes in Python

  • PEP is maintained by the Python community

  • PEP is assigned a number and categorized based on its type

  • Examples of PEPs include PEP 8 (Style Guide for Python Code) and PEP 20 (The Zen of Python)

Q36. What is function

Ans.

A function is a block of code that performs a specific task and can be called multiple times throughout a program.

  • Functions are defined using the 'def' keyword followed by the function name and parentheses.

  • Functions can take arguments (inputs) and return values (outputs).

  • Functions can be called multiple times throughout a program, making code more efficient and modular.

  • Example: def add_numbers(x, y): return x + y

  • Example: result = add_numbers(2, 3)

Frequently asked in,

Q37. write down 10 properties in css

Ans.

CSS properties control the visual presentation of elements on a webpage.

  • color: sets the color of text

  • font-size: determines the size of text

  • background-color: specifies the background color of an element

  • border: defines the border around an element

  • margin: sets the margin outside an element

  • padding: determines the padding inside an element

  • text-align: aligns text within an element

  • display: specifies how an element is displayed

  • width: sets the width of an element

  • height: determines the...read more

Q38. str="Hello world" print(str[4:8] )

Ans.

The code will print 'o wo', which is the substring of 'Hello world' starting from index 4 up to index 7.

  • The slicing operation str[4:8] extracts characters from index 4 to index 7 (exclusive) from the string 'Hello world'.

  • The index 4 corresponds to the character 'o' and index 7 corresponds to the character 'd'.

  • Therefore, the output of print(str[4:8]) will be 'o wo'.

Q39. Difference between tuple and list

Ans.

Tuple is immutable and ordered while list is mutable and ordered.

  • Tuple uses () while list uses []

  • Tuple cannot be modified while list can be modified

  • Tuple is faster than list for accessing elements

  • Tuple is used for fixed data while list is used for dynamic data

Frequently asked in,

Q40. write down 10 tags in html

Q41. give an example of slicing

Ans.

Slicing is a way to extract a portion of a sequence (string, list, tuple) in Python.

  • Slicing is done using the colon (:) operator.

  • The syntax for slicing is [start:stop:step].

  • start is the index where the slice starts (inclusive), stop is the index where the slice ends (exclusive), and step is the size of the jump between indices.

  • If start or stop is not specified, it defaults to the beginning or end of the sequence.

  • If step is not specified, it defaults to 1.

  • Examples: 'hello'[1:4...read more

Q42. explain list and tuple

Ans.

List and tuple are both data structures in Python used to store collections of items.

  • Lists are mutable and can be modified after creation.

  • Tuples are immutable and cannot be modified after creation.

  • Lists are defined using square brackets [], while tuples are defined using parentheses ().

  • Lists are typically used for collections of similar items, while tuples are used for collections of different items.

  • Lists have several built-in methods for manipulation, such as append(), remov...read more

Q43. Architecture of django

Ans.

Django follows Model-View-Controller (MVC) architectural pattern.

  • Django uses ORM to interact with the database.

  • Views handle user requests and return responses.

  • Templates render HTML pages with dynamic data.

  • Models define the database schema and handle data manipulation.

  • URLs map user requests to appropriate views.

  • Django also supports Model-View-Template (MVT) pattern.

Q44. Enter the two number

Ans.

The question asks for two numbers to be entered.

  • Ask for input from user using input() function

  • Store the input values in variables

  • Convert the input values to integers using int() function

  • Perform required operations on the numbers

Q45. write a code for pattern

Ans.

Code to print a pattern using nested loops

  • Use nested loops to iterate through rows and columns

  • Print different characters or numbers based on the pattern

  • Adjust loop conditions and characters to create different patterns

Q46. Join query of sql

Ans.

Join query is used to combine rows from two or more tables based on a related column between them.

  • Use JOIN keyword followed by the table name and ON keyword to specify the related column

  • Types of join: INNER JOIN, LEFT JOIN, RIGHT JOIN, FULL OUTER JOIN

  • Example: SELECT * FROM table1 JOIN table2 ON table1.column = table2.column

  • Avoid using SELECT * in join queries

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