Expressions and Numerical Types in Python

📌 What is an Expression?

An expression is a combination of values, variables, and operators that Python can calculate (or evaluate) and give a result.

Example:

5 + 3

• 👉 This is an expression. It combines two numbers and a plus sign.
• 👉 The result of this expression is 8.

x = 10
y = x + 5

• 👉 Here, x + 5 is an expression.
• 👉 Python will calculate it and store 15 in y.

🧮 What are Numerical Types?

In Python, numbers come in different types based on how they are used.

There are mainly three types of numbers in Python:

1. int – Integer

These are whole numbers. They don't have any decimal point.

a = 5       # integer
b = -100    # negative integer

2. float – Floating Point Number

These are numbers with decimal points.

x = 3.14     # float
y = -0.5     # negative float

3. complex – Complex Numbers

These numbers have a real and an imaginary part.
Used mostly in higher math and science.

z = 2 + 3j   # complex number

You can check the type using type():

print(type(10))       # <class 'int'>
print(type(3.5))      # <class 'float'>
print(type(2 + 3j))   # <class 'complex'>

➕ Arithmetic Operators in Python

Python can do basic math using operators. These are:

Operator	Meaning	Example	Result
+	Addition	5 + 3	8
-	Subtraction	7 - 2	5
*	Multiplication	4 * 3	12
/	Division	10 / 2	5.0
//	Floor Division	10 // 3	3
%	Modulus (remainder)	10 % 3	1
**	Power	2 ** 3	8

✅ Summary

• An expression is a combination of numbers, variables, and operators.
• int, float, and complex are the 3 main number types in Python.
• Python supports all basic math operations like +, -, *, /, %, etc.
• Python follows the BODMAS rule for solving expressions.
• You can use functions like abs(), round(), pow() with numbers.