Mastering Python Concepts

What is the output of print(2 ** 3)?

• 9

• 4

• 8

• 6

How do you create a list in Python?

• You create a list in Python using square brackets, e.g., my_list = [] or my_list = [1, 2, 3].

• You create a list in Python by using the list() function without any arguments, e.g., my_list = list().

• You create a list in Python using parentheses, e.g., my_list = (1, 2, 3).

• You create a list in Python using curly braces, e.g., my_list = {}.

What is the purpose of the 'self' keyword in Python classes?

• The 'self' keyword is a built-in function in Python.

• The 'self' keyword is used to create static methods.

• The 'self' keyword is used to define class variables.

• The 'self' keyword is used to refer to the instance of the class.

How can you handle exceptions in Python?

• Use if-else statements to handle exceptions in Python.

• Use try-except blocks to handle exceptions in Python.

• Ignore exceptions and continue execution without handling them.

• Use switch-case statements to manage exceptions in Python.

What is a lambda function in Python?

• A lambda function is a method for defining classes in Python.

• A lambda function is a built-in data structure in Python.

• A lambda function is an anonymous function defined with the lambda keyword, allowing for quick, single-expression functions.

• A lambda function is a type of variable in Python.

Explain the difference between a list and a tuple.

• A list can only contain numbers, while a tuple can contain any data type.

• A list is always ordered, whereas a tuple is unordered.

• A list is mutable and can be modified, while a tuple is immutable and cannot be changed after creation.

• A list is defined using parentheses, while a tuple is defined using square brackets.

What does the 'with' statement do in Python?

• The 'with' statement is used to declare global variables in Python.

• The 'with' statement is a way to create loops in Python.

• The 'with' statement simplifies exception handling by encapsulating common preparation and cleanup tasks.

• The 'with' statement is used to define functions in Python.

How do you read a file in Python?

• Use 'with open(filename, 'r') as file: content = file.read()' to read a file in Python.

• Use 'with open(filename, 'w') as file: content = file.read()' to read a file in Python.

• Read a file by calling 'file.read(filename)' directly.

• Use 'open(filename) as file: content = file.read()' to read a file in Python.

What is the purpose of the 'if __name__ == "__main__":' statement?

• To define global variables for the entire script.

• To handle exceptions in the code.

• To ensure the script runs faster when imported.

• To allow code to run only when the script is executed directly, not when imported.

What is a dictionary in Python and how is it different from a list?

• A dictionary is a collection of key-value pairs, while a list is an ordered collection of items.

• A dictionary is a type of list that can only contain strings.

• A dictionary is a collection of unique items, while a list can have duplicate values.

• A dictionary is an unordered collection of items, while a list is a collection of key-value pairs.