Mastering Python Basics

What is the correct way to declare a variable in Python?

• var x: int = 5

• x = 5

• x := 5

• let x = 5

How do you assign a value to a variable in Python?

• Assign values using the '->' operator.

• Variables are assigned values by enclosing them in parentheses.

• Use the '=' operator to assign a value to a variable.

• Use the '==' operator to assign a value to a variable.

Define a function in Python and provide an example of how to call it.

• def greet(name): return f'Hello, {name}!' # Example of calling the function: print(greet('Alice'))

• greet(name): print('Greetings, ' + name)

• def greet(): return 'Hello!'

• def hello(name): return 'Hi, ' + name

What is the output of the following code: print('Hello' + ' World')?

• Hello World

• Hello, World

• Hello World!

• HelloWorld

How do you access the first character of a string in Python?

• s[1]

• s.first()

• s.get(0)

• s[0]

What is string slicing and how is it used in Python?

• String slicing is used to convert a string to uppercase in Python.

• String slicing allows you to replace characters in a string directly in Python.

• String slicing is a method to concatenate two strings in Python.

• String slicing is a method to extract parts of a string using the syntax string[start:end:step] in Python.

Explain type casting in Python with an example.

• Example: num_str = '123'; num_int = int(num_str); # num_int is now an integer 123

• Example: num_list = [1, 2, 3]; num_str = str(num_list); # num_str is now a string '[1, 2, 3]'

• Example: num_float = 123.45; num_str = str(num_float); # num_str is now a string '123.45'

• Example: num_bool = True; num_int = int(num_bool); # num_int is now an integer 1

What will be the output of int('5') + 2?

• 10

• 7

• 2

• 5

How do you use the math module to find the square root of a number?

• Use 'math.sqrt(number)' after importing the math module.

• Call 'math.root(number)' to get the square root directly.

• Use 'math.square_root(number)' after importing the math module.

• Use 'sqrt(number)' without importing any module.

What is the purpose of the input() function in Python?

• The purpose of the input() function in Python is to read user input as a string.

• To display output to the user.

• To execute a loop in a program.

• To convert strings to integers.