pytnbeginer

Question 1

What are the basic data types in Python?

Answer 1

The basic data types in Python are int, float, str, and bool.

Question 2

How do you write an if statement in Python?

Answer 2

An if statement in Python is written as:
if condition:
# code to execute if condition is true

Question 3

What is a function in Python?

Answer 3

A function in Python is a block of code that performs a specific task. It is defined using the ‘def’ keyword.

Question 4

How do you create a list in Python?

Answer 4

A list in Python is created using square brackets, e.g., my_list = [1, 2, 3]

Question 5

What is a dictionary in Python?

Answer 5

A dictionary in Python is a collection of key-value pairs, e.g., my_dict = {‘key1’: ‘value1’, ‘key2’: ‘value2’}

Question 6

How do you handle exceptions in Python?

Answer 6

Exceptions in Python are handled using try/except blocks. Code that may raise an exception is placed in the try block, and the code to handle the exception is placed in the except block.

Question 7

What is a class in Python?

Answer 7

A class in Python is a blueprint for creating objects. It is defined using the ‘class’ keyword.

Question 8

How do you create a tuple in Python?

Answer 8

A tuple in Python is created using parentheses, e.g., my_tuple = (1, 2, 3)

Question 9

What is a set in Python?

Answer 9

A set in Python is an unordered collection of unique elements, e.g., my_set = {1, 2, 3}

Question 10

How do you read a file in Python?

Answer 10

To read a file in Python, use the open() function with the ‘r’ mode, e.g., with open(‘file.txt’, ‘r’) as file: content = file.read()

Question 11

How do you write to a file in Python?

Answer 11

To write to a file in Python, use the open() function with the ‘w’ mode, e.g., with open(‘file.txt’, ‘w’) as file: file.write(‘text’)

Question 12

What is a module in Python?

Answer 12

A module in Python is a file containing Python code that can be imported and used in other Python programs.

Question 13

How do you import a module in Python?

Answer 13

To import a module in Python, use the import statement, e.g., import module_name

Question 14

What is a package in Python?

Answer 14

A package in Python is a collection of modules organized in directories.

Question 15

How do you install a package in Python?

Answer 15

To install a package in Python, use pip, e.g., pip install package_name

Question 16

What is a loop in Python?

Answer 16

A loop in Python is used to iterate over a sequence of elements.

Question 17

How do you write a for loop in Python?

Answer 17

A for loop in Python is written as:
for element in sequence:
# code to execute for each element

Question 18

How do you write a while loop in Python?

Answer 18

A while loop in Python is written as:
while condition:
# code to execute while condition is true

Question 19

What is the difference between a list and a tuple?

Answer 19

A list is mutable (can be changed), whereas a tuple is immutable (cannot be changed).

Question 20

How do you access elements in a list?

Answer 20

Elements in a list are accessed using their index, e.g., my_list[0]

Question 21

How do you add elements to a list?

Answer 21

Elements are added to a list using the append() method, e.g., my_list.append(4)

Question 22

How do you remove elements from a list?

Answer 22

Elements are removed from a list using the remove() method, e.g., my_list.remove(2)

Question 23

What is a lambda function in Python?

Answer 23

A lambda function in Python is a small anonymous function defined using the lambda keyword, e.g., lambda x: x * 2

Question 24

How do you create a dictionary with default values?

Answer 24

A dictionary with default values is created using defaultdict from the collections module, e.g., defaultdict(int)

Question 25

How do you iterate over a dictionary?

Answer 25

You iterate over a dictionary using a for loop, e.g., for key, value in my_dict.items():

Question 26

How do you create a list comprehension?

Answer 26

A list comprehension is a concise way to create lists, e.g., [x for x in range(5)]

Question 27

What is the difference between ‘==’ and ‘is’ in Python?

Answer 27

’==’ checks for value equality, while ‘is’ checks for identity (whether they are the same object).

Question 28

How do you check if a key exists in a dictionary?

Answer 28

To check if a key exists in a dictionary, use the in keyword, e.g., ‘key’ in my_dict

Question 29

How do you merge two dictionaries?

Answer 29

To merge two dictionaries, use the update() method, e.g., dict1.update(dict2)

Question 30

How do you sort a list in Python?

Answer 30

To sort a list in Python, use the sort() method, e.g., my_list.sort()

Question 31

What is a generator in Python?

Answer 31

A generator in Python is a function that returns an iterator using the yield keyword.

Question 32

How do you create a generator?

Answer 32

A generator is created like a regular function but uses the yield keyword instead of return.

Question 33

What is the use of ‘yield’ keyword in Python?

Answer 33

The ‘yield’ keyword is used to produce a value from a generator and pause its state.

Question 34

How do you handle multiple exceptions in a single block?

Answer 34

Multiple exceptions are handled using multiple except blocks or a single except block with a tuple of exceptions.

Question 35

What is the purpose of the ‘finally’ block?

Answer 35

The ‘finally’ block contains code that will run no matter what, whether an exception occurs or not.

Question 36

How do you define a class method?

Answer 36

A class method is defined using the @classmethod decorator and takes cls as its first parameter.

Question 37

What is inheritance in Python?

Answer 37

Inheritance in Python allows a class to inherit attributes and methods from another class.

Question 38

How do you override a method in Python?

Answer 38

To override a method in Python, define a method in the subclass with the same name as in the superclass.

Question 39

What is polymorphism in Python?

Answer 39

Polymorphism in Python allows methods to do different things based on the object it is acting upon.

Question 40

How do you create an instance of a class?

Answer 40

An instance of a class is created by calling the class, e.g., my_object = MyClass()

Question 41

What is encapsulation in Python?

Answer 41

Encapsulation in Python is the bundling of data and methods that operate on that data within a single unit.

Question 42

How do you define a private attribute in a class?

Answer 42

A private attribute in a class is defined by prefixing it with double underscores, e.g., __my_private_attr

Question 43

What is the purpose of the ‘self’ parameter?

Answer 43

The ‘self’ parameter refers to the instance of the class and is used to access variables and methods associated with the class.

Question 44

How do you create a constructor in Python?

Answer 44

A constructor in Python is defined using the __init__ method and initializes the object’s attributes.

Question 45

What is a decorator in Python?

Answer 45

A decorator in Python is a function that modifies the behavior of another function.

Question 46

How do you use the ‘with’ statement for file handling?

Answer 46

The ‘with’ statement is used for resource management and ensures proper acquisition and release of resources, e.g., with open(‘file.txt’, ‘r’) as file:

Question 47

What is the ‘pass’ statement used for?

Answer 47

The ‘pass’ statement is a null operation used as a placeholder in functions, loops, etc.

Question 48

How do you convert a string to an integer in Python?

Answer 48

To convert a string to an integer in Python, use the int() function, e.g., int(‘123’)

Question 49

How do you check the length of a list in Python?

Answer 49

To check the length of a list in Python, use the len() function, e.g., len(my_list)

Question 50

How do you concatenate strings in Python?

Answer 50

To concatenate strings in Python, use the + operator, e.g., ‘Hello’ + ‘ ‘ + ‘World’