Python Variables and Data Types Exercises

You are exploring how Python handles variables and data types. In Python, variables can be created simply by assigning a value to a name, and the interpreter automatically understands the type.

Consider the following scenario:
You assign different values to different variables and want to understand how Python interprets and stores their data types.

Which of the following statements correctly explains how Python handles variables and data types?

Python requires explicit type declarations like int x = 5 before using any variable, similar to C or Java.

In Python, variables are declared using the var keyword, and all variables are dynamically converted to strings.

Python supports static typing, so once a variable is assigned a type, it cannot be changed later.

Python uses dynamic typing, where the type of a variable is determined at runtime based on the assigned value.

Python uses dynamic typing, meaning you do not need to declare the data type of a variable explicitly.
For example:

x = 10        # x is an int
x = "Hello"   # Now x is a str

The variable x can point to different types of values over its lifetime, and Python determines the type at runtime based on the value you assign. This makes Python flexible and concise but also requires developers to be mindful of types during operations like addition or comparisons.

There is no need for keywords like int, var, or type declarations when defining variables in Python.

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

x = 'Hello, World!"

x = "Hello, World!"

x = Hello, World!

x = 'Hello, World!

In Python, strings can be enclosed in either single quotes or double quotes. Option 2 is the correct declaration of a string.

Which data type is represented by the following code?

x = {1, 2, 3}

List

Tuple

Set

Dictionary

The curly braces {} are used to define a set in Python.

What is the result of the following code?

x = 10
y = 20
x, y = y, x
print(x, y)

10 20

20 10

None 20

10 None

The code swaps the values of x and y, so the output will be 20 10.

What will be the output of the following code?

x = "10"
y = int(x) + 5
print(y)

105

None

Error

The string "10" is converted to an integer using int(x). Then, int(x) + 5 results in 15.

Which of the following is the correct data type for below code?

x = True

Integer

Float

Boolean

String

Boolean values are represented as True or False in Python. Option 3 is the correct data type.

What will be the output of the following code?

x = "10"
y = 5
z = x * y
print(z)

1010101010

TypeError

Invalid Operation

In Python, multiplying a string by an integer repeats the string that many times. So, "10" * 5 becomes "1010101010".

Which of the following is a correct way to define a complex number in Python?

num = 3 + 4i

num = 3 + 4j

num = complex(3 + 4j)

Both Option2 and Option3

Python uses j to represent the imaginary part of complex numbers. Both 3 + 4j and complex(3 + 4j) are valid ways to define a complex number.

What will be the output of the following code?

a = [1, 2, 3]
b = a
b[0] = 10
print(a)
print(b)

[1, 2, 3]

[10, 2, 3]

[10, 2, 3] [10, 2, 3]

[1, 2, 3] [1, 2, 3]

In Python, lists are mutable and passed by reference. Changing an element in b also changes a, since both variables point to the same list in memory.

What will be the output of the following code?

a = (1, 2, 3)
a[0] = 10
print(a)

TypeError

(10, 2, 3)

(1, 2, 3)

Nothing will be printed

Tuples are immutable in Python, so trying to modify an element will raise a TypeError.

What will be the output of the following code?

x = 10
y = 20
x, y = y, x
print(x)
print(y)

10 20

20 10

10 10

20 20

In Python, tuple unpacking allows swapping values in a single line. The values of x and y are swapped, so the output will be 20 10.

Which of the following will result in a SyntaxError?

a = 5 / 2

a = 5 // 2

a = 5 2

a = 5 % 2

5 2 is not a valid expression. You need an operator between numbers. This will raise a SyntaxError.

What is the output of the following code?

a = 10
b = 20
c = 30
d = 40
result = a and b or c and d
print(result)

The and and or operators work by evaluating the first truthy value. In the expression, 10 and 20 evaluates to 20, which is truthy. So, 20 or 30 and 40 returns 20.

About This Exercise: Python – Variables and Data Types

Welcome to the Python Variables and Data Types exercises — a fundamental yet crucial part of your Python learning journey. These exercises are designed to help you understand how Python stores, processes, and categorizes different kinds of data using variables and built-in data types. Whether you're a beginner trying to grasp the basics or someone revisiting Python to strengthen your foundations, this section will give you the clarity and hands-on practice you need.

In Python, variables act as containers for storing data, and data types define the kind of data a variable can hold — such as integers, floats, strings, booleans, and more. This set of exercises introduces you to variable declaration, type conversion, dynamic typing, and type inference in Python. You’ll also learn how Python handles common operations like concatenation, arithmetic, and comparisons depending on data types.

Each problem in this section is carefully crafted to not only reinforce theory but also highlight common real-world scenarios where proper understanding of variables and data types can prevent bugs and make your code more efficient. You’ll gain confidence in choosing the right data type for the right job — whether it's managing user input, performing calculations, or building complex logic.

These Python exercises focus on both core concepts and tricky edge cases involving mutable vs immutable types, memory allocation, and how Python handles data under the hood. That’s especially important for anyone planning to move into more advanced topics like data structures, functions, file handling, or object-oriented programming.

All the exercises here are beginner-friendly but come with enough depth to challenge your understanding. They are perfect for school students, university coursework, interview preparation, or anyone following a self-taught Python track. We also recommend pairing these exercises with our interactive quizzes for deeper retention and concept testing.

By mastering Python variables and data types, you'll build the confidence to manipulate and control data effectively — a skill that forms the backbone of every successful Python project, whether in web development, data analysis, automation, or machine learning.

Start practicing now and solidify your understanding of Python variables and data types through real-world examples and hands-on coding challenges. The more you practice, the better you'll understand how Python truly works — and that’s the first big step toward writing clean, bug-free code.

Python Variables and Data Types Exercises

You are exploring how Python handles variables and data types. In Python, variables can be created simply by assigning a value to a name, and the interpreter automatically understands the type.

Consider the following scenario:
You assign different values to different variables and want to understand how Python interprets and stores their data types.

Which of the following statements correctly explains how Python handles variables and data types?

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

Which of the following is the correct data type for a number with a decimal point?

Which of the following is an invalid variable name in Python?

Which data type is represented by the following code?

What is the result of the following code?

What will be the output of the following code?

Which of the following is the correct data type for below code?

What will be the output of the following code?

Which of the following is a correct way to define a complex number in Python?

What is the data type of the result of the expression 5 / 2 in Python 3?

Which data type is mutable in Python?

What will be the output of the following code?

What will be the output of the following code?

What will be the output of the following code?

Which of the following will result in a SyntaxError?

What is the output of the following code?

About This Exercise: Python – Variables and Data Types

Python Variables and Data Types Exercises

You are exploring how Python handles variables and data types. In Python, variables can be created simply by assigning a value to a name, and the interpreter automatically understands the type.

Consider the following scenario: You assign different values to different variables and want to understand how Python interprets and stores their data types.

Which of the following statements correctly explains how Python handles variables and data types?

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

Which of the following is the correct data type for a number with a decimal point?

Which of the following is an invalid variable name in Python?

Which data type is represented by the following code?

What is the result of the following code?

What will be the output of the following code?

Which of the following is the correct data type for below code?

What will be the output of the following code?

Which of the following is a correct way to define a complex number in Python?

What is the data type of the result of the expression 5 / 2 in Python 3?

Which data type is mutable in Python?

What will be the output of the following code?

What will be the output of the following code?

What will be the output of the following code?

Which of the following will result in a SyntaxError?

What is the output of the following code?

About This Exercise: Python – Variables and Data Types

Consider the following scenario:
You assign different values to different variables and want to understand how Python interprets and stores their data types.