Python Coding Challange - Question with Answer (01071025)

🔹 Step 1: val = 5

A global variable val is created with the value 5.

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🔹 Step 2: Function definition

def demo(val = val + 5):

When Python defines the function, it evaluates all default argument expressions immediately — not when the function is called.

So here:

• It tries to compute val + 5

• But val inside this expression is looked up in the current (global) scope — where val = 5.

✅ Hence, the default value becomes val = 10.

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🔹 Step 3: Function call

demo()

When the function runs:

• No argument is passed, so it uses the default value val = 10.

• Then it prints 10.

✅ Output:

10

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⚠️ Important Note:

If the global val didn’t exist before defining the function, Python would raise a NameError because it can’t evaluate val + 5 at definition time.

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🔍 Summary

Step	Explanation	Result
Global variable	val = 5	Creates a variable
Default argument evaluated	val + 5 → 10	At definition time
Function call	demo()	Uses default
Output	10	✅

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