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Instead of moving to a complex topic, let's solve simple math problems and get a clear idea of how Python calculations happen.
All basic mathematical calculations are done using expressions.
Let's understand some of the commonly used operators for performing expressions.
How Does Python Solve an Expression?
Let's run these expressions in Python IDLE.
>>> 2 + 2
4
Here, 2 is a value and + is an operator.
It was simple. What if we have to solve a big expression with many operators?
>>> (5 - 1) * ((7 + 1) / (3 - 1))
16.0
To solve this, we need to understand the simple rules of how each operator works and what priority it has.
If you solved math problems in high school, we followed a rule called the BODMAS rule.
After applying those rules, we were able to get the correct answer; otherwise, the result would have been wrong.
Similarly, Python also follows those rules.
| Operator | Name | What it does | Example | Result |
|---|---|---|---|---|
() |
Parentheses | Forces this part to be calculated first | (2 + 3) * 4 |
20 |
** |
Exponentiation | Raises a number to a power | 2 ** 3 |
8 |
* |
Multiplication | Multiplies numbers | 4 * 5 |
20 |
/ |
Division | Divides and gives a decimal/float result | 10 / 4 |
2.5 |
// |
Floor division | Divides and rounds down | 10 // 4 |
2 |
% |
Modulus | Gives the remainder | 10 % 4 |
2 |
+ |
Addition | Adds numbers | 5 + 3 |
8 |
- |
Subtraction | Subtracts numbers | 5 - 3 |
2 |
Note: Parentheses aren't technically an operator; they're used to control the order.
Priority to remember
| Priority | Use |
|---|---|
| 1 | () |
| 2 | ** |
| 3 |
*, /, //, %
|
| 4 |
+, -
|
There are many other operators, but these are the basic arithmetic operators we use in Python.
These operators are categorized as arithmetic operators.
Later, based on the use case, we will learn those operators soon.
Wrapping Up
Now we understand basic mathematical operations. In the next article, we can go through the data types of Python.
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Blast-Radius Aware AI Code Review for Business-Critical Systems
LiveReview: Blast-Radius Aware AI Code Review for Business-Critical Systems
LiveReview is an AI code reviewer that scores every hunk of a diff by blast radius: how far a change reaches through your call graph, how much persistent state it touches, and how well-tested it is. A 3-line change to a shared auth check can outrank a 300-line UI tweak. Your team's attention goes to the highest-risk code first, not spread evenly across every diff.
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