Python Interview Question and Answer

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Most Asked Python Interview Questions with Answers

 

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Here are some common Python interview questions and their answers:

1. What is Python?
Python is a high-level, interpreted programming language that emphasizes code readability and simplicity. It is used for a wide range of applications, including web development, data analysis, and machine learning.

2. What are the benefits of using Python?
Some of the major benefits of using Python include its ease of use, readability, versatility, and large community support. It also has many libraries and frameworks that make it easy to build complex applications quickly.

3. What is PEP 8?
PEP 8 is a style guide for writing Python code. It provides guidelines on how to format code, naming conventions, and other best practices.

4. What is a virtual environment in Python?
A virtual environment is an isolated environment where you can install Python packages and dependencies without affecting the system-wide installation. It allows you to work on different projects with different dependencies, without worrying about conflicts.

5. What is a lambda function in Python?
A lambda function is a small, anonymous function that can take any number of arguments but can only have one expression. It is defined using the lambda keyword.

Example:

double = lambda x: x*2
print(double(5)) # Output: 10

6. How do you handle errors and exceptions in Python?
Errors and exceptions can be handled using try and except blocks in Python. The try block is used to execute the code that might raise an error, and the except block is used to handle the error if it occurs.

Example:

try:
   # some code that might raise an error
except ExceptionType:
   # handle the error

7. What is the difference between a list and a tuple in Python?
Lists and tuples are two types of sequences in Python. The main difference between them is that lists are mutable (can be changed), while tuples are immutable (cannot be changed).

Example:

list1 = [1, 2, 3]
tuple1 = (1, 2, 3)
list1[0] = 5
# Output: [5, 2, 3]
# The following line will raise an error
tuple1[0] = 5

8. What is the difference between == and is in Python?
The == operator is used to compare the values of two objects, while the is operator is used to compare the identities of two objects. In other words, == checks for equality, while is checks for identity.

Example:

a = [1, 2, 3]
b = [1, 2, 3]
print(a == b) # Output: True
print(a is b) # Output: False

9. What is a decorator in Python?
A decorator is a special type of function that can be used to modify the behavior of another function. It takes a function as an argument and returns a new function that can add functionality to the original function.

Example:

def my_decorator(func):
    def wrapper():
        print("Before function call")
        func()
        print("After function call")
    return wrapper

@my_decorator
def say_hello():
    print("Hello world")

say_hello()

Output:

Before function call
Hello world
After function call

10. What is the difference between a set and a frozenset in Python?
Sets and frozensets are two types of unordered collections in Python. The main difference between them is that sets are mutable (can be changed), while frozensets are immutable (cannot be changed).

Example:

set1 = {1, 2, 3}
frozenset1 = frozenset({1, 2, 3})
set1.add(4)
# Output: {1, 2, 3, 4}
# The following line will raise an error
frozenset1.add(4)

These are just some of the common interview questions related to Python. It's always a good idea to practice coding and review the fundamentals to prepare for any Python interview.