Arithmetic operators in Python - Step-by-Step Execution

Concept Flow - Arithmetic operators

Start

↓

Read operands

↓

Choose operator

↓

Perform calculation

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Store/Display result

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End

This flow shows how arithmetic operators take two numbers, perform a calculation, and give a result.

Execution Sample

Python

a = 10
b = 3
sum = a + b
product = a * b
result = a / b

This code adds, multiplies, and divides two numbers, storing each result.

Execution Table

Step	Expression	Operands	Operation	Result
1	a = 10	-	Assign 10 to a	a=10
2	b = 3	-	Assign 3 to b	b=3
3	sum = a + b	a=10, b=3	Addition	sum=13
4	product = a * b	a=10, b=3	Multiplication	product=30
5	result = a / b	a=10, b=3	Division	result=3.3333333333333335

💡 All arithmetic operations completed and results stored.

Variable Tracker

Variable	Start	After Step 1	After Step 2	After Step 3	After Step 4	After Step 5
a	undefined	10	10	10	10	10
b	undefined	undefined	3	3	3	3
sum	undefined	undefined	undefined	13	13	13
product	undefined	undefined	undefined	undefined	30	30
result	undefined	undefined	undefined	undefined	undefined	3.3333333333333335

Key Moments - 3 Insights

Why does division result in a decimal number instead of an integer?

In step 5, division (a / b) produces a float result even if both operands are integers, as shown in the execution_table row 5.

Why do variables keep their values after each step?

Each assignment stores the result in the variable, so the variable_tracker shows values persist after each step, as seen in the rows for 'a' and 'b'.

What happens if we use the subtraction operator instead of addition in step 3?

The operation would change from addition to subtraction, and the result in step 3 would be 7 instead of 13, changing the sum variable accordingly.

Visual Quiz - 3 Questions

Look at the execution_table at step 5, what is the value of 'result'?

A 13

B 3

C 3.3333333333333335

D 30

💡 Hint

Check the 'Result' column in execution_table row 5.

At which step is the multiplication operation performed?

A Step 2

B Step 4

C Step 3

D Step 5

💡 Hint

Look at the 'Operation' column in execution_table to find multiplication.

If variable 'b' was changed to 5 before step 3, what would be the new value of 'sum' at step 3?

A 15

B 13

C 8

D 10

💡 Hint

Sum is a + b; changing b to 5 means sum = 10 + 5.

Concept Snapshot

Arithmetic operators perform basic math on numbers.
Common operators: + (add), - (subtract), * (multiply), / (divide).
Operands are numbers or variables.
Result is stored or used immediately.
Division always returns a float in Python.
Use parentheses to control order.

Full Transcript

This lesson shows how arithmetic operators work in Python. We start by assigning numbers to variables a and b. Then we add a and b, multiply them, and divide a by b. Each step stores the result in a new variable. The division produces a decimal number even though both inputs are integers. Variables keep their values after assignment. Changing an operator changes the result. This helps understand how basic math works in programming.