Python Coding Challange - Question with Answer (01010525)

 

Line-by-line Explanation

a = 5

This initializes the variable a with the value 5.

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while a < 20:

This starts a while loop that continues as long as a is less than 20.

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print(a)

This prints the current value of a before it's updated.

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a = a * 2 - 1

This is the key logic:

• Multiply a by 2.

• Subtract 1 from the result.

• Store the new value back in a.

So the formula is:

new a = (old a × 2) - 1

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What Happens in Each Iteration?

Iteration	Value of a before print	Printed	New value of a (a * 2 - 1)
1	5	5	(5×2)-1 = 9
2	9	9	(9×2)-1 = 17
3	17	17	(17×2)-1 = 33 → loop ends

Why the loop ends?

Because after the 3rd iteration, a becomes 33, which is not less than 20, so the loop condition a < 20 fails.

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✅ Final Output:

5
9
17

Application of Python in Audio and Video Processing
https://pythonclcoding.gumroad.com/l/vrhkx