Python Coding Challange - Question with Answer (01030625)

 

✅ Line-by-Line Explanation

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import array as arr

This imports Python’s built-in array module and gives it the alias arr for convenience.

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e = arr.array('I', [0, 1, 255])

• This creates an array named e.

• 'I' is the type code for unsigned integers (typically 4 bytes, non-negative only).

• [0, 1, 255] is the initial list of integers. All are valid non-negative values for unsigned int.

So now e contains:

array('I', [0, 1, 255])

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e.append(-1)

• This line tries to append -1 to the unsigned integer array.

• But 'I' means only non-negative integers are allowed.

• -1 is a negative value, which cannot be represented by 'I'.

❌ What happens?

This line causes an OverflowError:

OverflowError: can't convert negative value to unsigned int

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print(e)

This line will not execute because the program will stop at the error above.

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 Summary:

• 'I' stands for unsigned integers (0 and above).

• Appending a negative number like -1 to such an array is invalid.

• This results in an OverflowError.

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✅ Corrected Version:

If you want to allow negative numbers, use 'i' (signed int) instead:

import array as arr
e = arr.array('i', [0, 1, 255])
e.append(-1)
print(e)

Output:

array('i', [0, 1, 255, -1])

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