Python interview question 2023

  1. What is Python?

Answer: Python is a high-level, interpreted programming language that is widely used for web development, data analysis, artificial intelligence, and scientific computing. It is known for its simplicity, readability, and flexibility.

  1. How is Python different from other programming languages?

Answer: Python is different from other programming languages in several ways. It is an interpreted language, which means that the code is not compiled into machine language before execution. This makes it easier to develop and debug code, but it may be slower than compiled languages. Python also has a large and active community of developers, which means there is a wealth of resources and libraries available for use.

  1. What are some key features of Python?

Answer: Some key features of Python include:

Dynamically-typed: Python does not require variables to be declared with a specific type, and the type can be changed at any time.

Object-oriented: Python supports object-oriented programming, which means that code is organized into classes and objects.

High-level: Python abstracts away many of the low-level details of computer hardware, making it easier to write code.

Portable: Python code can be run on multiple platforms without requiring any changes.

  1. What are some common uses for Python?

Answer: Python is used in a wide variety of fields and applications, including:

  • Web development
  • Data analysis and scientific computing
  • Artificial intelligence and machine learning
  • Desktop applications
  • System scripting
  1. How do you print to the console in Python?

Answer: To print to the console in Python, you can use the print() function. For example:

Copy codeprint("Hello, World!")
  1. How do you comment code in Python?

Answer: To comment code in Python, you can use the pound symbol ( # ). Any text after the pound symbol on a line will be ignored by the interpreter. You can also use triple quotes ( “”” or ”’ ) to create a multi-line comment.

  1. What is a variable in Python?

Answer: In Python, a variable is a named location in memory where a value can be stored and accessed. Variables are used to store data and can be modified and reassigned.

  1. How do you create a variable in Python?

Answer: To create a variable in Python, you simply need to give it a name and assign it a value using the assignment operator ( = ). For example:

Copy codemessage = "Hello, World!"
  1. What are some common data types in Python?

Answer: Some common data types in Python include:

  • Integer: A whole number, such as 1, 2, or 3.
  • Float: A decimal number, such as 1.0, 2.5, or 3.14.
  • String: A sequence of characters, such as “Hello” or “World”.
  • Boolean: A value that is either True or False.
  • List: An ordered collection of items, such as [1, 2, 3] or [“Apple”, “Banana”, “Carrot”].
  • Tuple: An immutable (unchangeable) collection of items, such as (1, 2, 3) or (“Apple”, “Banana”, “Carrot”).
  • Dictionary: A collection of key-value pairs, such as {“name”: “John”, “age”: 30}.
  1. How do you create a function in Python?

Answer: To create a function in Python, you can use the def keyword followed by the function name and a set of parentheses that may include parameters. The function code is indented and placed inside the curly braces. For example

def greet(name):
  print("Hello, " + name + "!")
  1. How do you call a function in Python?

Answer: To call a function in Python, you can simply use the function name followed by a set of parentheses that may include any necessary arguments. For example:

greet("John")  # Output: "Hello, John!"
  1. What is an exception in Python?

Answer: An exception in Python is an error that occurs during the execution of a program. Exceptions can be handled using try-except blocks, which allow you to gracefully handle the error and continue executing the program.

  1. How do you handle exceptions in Python?

Answer: To handle exceptions in Python, you can use a try-except block. The try block contains the code that may throw an exception, and the except block contains the code that will be executed if an exception is thrown. For example:

try:
  x = 1 / 0  # This line will cause a ZeroDivisionError exception
except ZeroDivisionError:
  print("Division by zero is not allowed.")
  1. What is a class in Python?

Answer: In Python, a class is a blueprint for creating objects. A class defines the attributes and behaviors of an object, and objects are instances of a class.

  1. How do you create a class in Python?

Answer: To create a class in Python, you can use the class keyword followed by the class name and a set of parentheses that may include a parent class. The class code is indented and placed inside the curly braces. For example:

class Dog:
  def __init__(self, name, breed):
    self.name = name
    self.breed = breed
  1. How do you create an object from a class in Python?

Answer: To create an object from a class in Python, you can use the class name followed by a set of parentheses that may include any necessary arguments. For example:

dog = Dog("Fido", "Labrador")
  1. How do you access the attributes of an object in Python?
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Answer: To access attributes of an object in Python, you can use the dot notation. For example:

Copy codedog = Dog("Fido", "Labrador")
print(dog.name)  # Output: "Fido"
print(dog.breed)  # Output: "Labrador"
  1. How do you call the methods of an object in Python?

Answer: To call methods of an object in Python, you can use the dot notation followed by the method name and a set of parentheses that may include any necessary arguments. For example:

Copy codedog = Dog("Fido", "Labrador")
dog.bark()  # Output: "Woof!"
  1. What is inheritance in Python?

Answer: Inheritance in Python allows a class to inherit attributes and behaviors from a parent class. This allows you to create a new class that is a modified version

  1. What is polymorphism in Python?

Answer: Polymorphism in Python refers to the ability of different objects to respond to the same method call in different ways. This can be achieved through inheritance and method overloading.

  1. How do you overload a method in Python?

Answer: To overload a method in Python, you can create multiple methods with the same name but different numbers or types of arguments. Python will automatically select the correct method to call based on the arguments passed.

  1. What is a module in Python?

Answer: In Python, a module is a collection of related functions, classes, and variables that can be imported into other Python scripts. Modules allow you to reuse code and organize your code into logical units.

  1. How do you import a module in Python?

Answer: To import a module in Python, you can use the import keyword followed by the module name. You can also use the from keyword to import specific items from a module. For example:

Copy codeimport math
from math import pi, sin
  1. What is a package in Python?

Answer: In Python, a package is a collection of modules organized into a directory structure. Packages allow you to further organize your code and import modules from multiple locations.

  1. How do you install a package in Python?

Answer: To install a package in Python, you can use the pip package manager. You can install a package by running the following command:

Copy codepip install package-name
  1. How do you access the documentation for a module or function in Python?

Answer: To access the documentation for a module or function in Python, you can use the help() function or the documentation string (docstring). The docstring is a string literal that appears at the beginning of a module, class, or function definition and provides a brief description of the object.

  1. What is a decorator in Python?

Answer: In Python, a decorator is a function that takes another function and extends the behavior of the latter function without explicitly modifying its code. Decorators are useful for adding functionality to existing functions without modifying their code.

  1. How do you create a decorator in Python?

Answer: To create a decorator in Python, you can define a function that takes another function as an argument and returns the modified function. You can then use the @ symbol followed by the decorator name to apply the decorator to a function. For example:

Copy codedef log_function(func):
  def wrapper(*args, **kwargs):
    print("Calling function:", func.__name__)
    result = func(*args, **kwargs)
    print("Result:", result)
    return result
  return wrapper

@log_function
def add(x, y):
  return x + y

Here are some suggestions for learning Python for an interview:

  1. Start by going through an online course or tutorial to get a basic understanding of the Python syntax and core concepts. There are many resources available for this, such as Codecademy or the Python documentation.
  2. Practice solving problems using Python. There are many websites, such as LeetCode and HackerRank, that have a large number of coding challenges you can use to practice your skills.
  3. Learn about the standard library and popular third-party libraries used in Python. It’s important to know how to use these libraries to perform common tasks, such as working with data, handling HTTP requests, and more.
  4. Understand how to write clean, efficient, and well-documented code. In Python, this means using good style and following the PEP 8 style guide, using appropriate data types and algorithms, and writing clear and concise comments.
  5. Familiarize yourself with common Python design patterns and best practices. For example, learn about object-oriented programming, error handling, and testing in Python.
  6. Stay up to date with the latest developments in the Python ecosystem. This includes learning about new features in the language, as well as new libraries and frameworks that are popular in the Python community.

I hope these suggestions are helpful! If you have any specific questions about learning Python for an interview.

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