Assignment and augmented assignment in Python - Step-by-Step Execution

Concept Flow - Assignment and augmented assignment

Start

↓

Assign value to variable

↓

Use variable in expression?

No→End

Yes↓

Perform calculation

↓

Update variable with new value

↓

Repeat or End

This flow shows how a variable gets a value, then can be updated using normal or augmented assignment.

Execution Sample

Python

x = 5
x += 3
x = x * 2
print(x)

Assign 5 to x, add 3 using +=, then multiply by 2, and print the result.

Execution Table

Step	Code executed	Variable x value	Explanation
1	x = 5	5	Assign 5 to x
2	x += 3	8	Add 3 to current x (5 + 3) and store back in x
3	x = x * 2	16	Multiply current x (8) by 2 and assign to x
4	print(x)	16	Output the current value of x
5	End	16	No more code to execute

💡 Program ends after printing x with value 16

Variable Tracker

Variable	Start	After Step 1	After Step 2	After Step 3	Final
x	undefined	5	8	16	16

Key Moments - 2 Insights

Why does x change from 5 to 8 after 'x += 3'?

Because 'x += 3' means 'add 3 to the current value of x and store it back in x', as shown in step 2 of the execution_table.

Is 'x = x * 2' the same as 'x *= 2'?

Yes, both multiply x by 2 and assign the result back to x. Step 3 shows the explicit form.

Visual Quiz - 3 Questions

Look at the execution_table, what is the value of x after step 2?

A 5

B 8

C 3

D 16

💡 Hint

Check the 'Variable x value' column at step 2 in the execution_table.

At which step does x get multiplied by 2?

A Step 3

B Step 1

C Step 2

D Step 4

💡 Hint

Look at the 'Code executed' column for multiplication in the execution_table.

If we replace 'x += 3' with 'x = 3', what would be x after step 2?

A 8

B 5

C 3

D 16

💡 Hint

Replacing 'x += 3' with 'x = 3' sets x directly to 3, overriding previous value.

Concept Snapshot

Assignment sets a variable: x = 5
Augmented assignment updates it: x += 3 (means x = x + 3)
You can also use other operators: -=, *=, /=
They combine calculation and assignment in one step
Use augmented assignment for shorter, clearer code

Full Transcript

This example shows how assignment and augmented assignment work in Python. First, x is assigned the value 5. Then, using augmented assignment 'x += 3', we add 3 to x's current value, making it 8. Next, we multiply x by 2 with 'x = x * 2', updating x to 16. Finally, we print x, which outputs 16. Augmented assignment combines calculation and assignment in one step, making code shorter and easier to read.