What will be the value of the variable string after the following code executes?
string = 'Hello'
string += ' world!'

Question

What will be the value of the variable string after the following code executes?
string = 'Hello'
string += ' world!'

BlackTom AI · Accepted Answer

Looking at the code snippet, the variable string starts with the value 'Hello'.
Option 1: ' world!' — This would represent only the second piece, but the operation string += ' world!' appends to the existing value rather than replacing it, so this option omits the initial 'Hello' and is incorrect.
Option 2: Nothing; this code is invalid — In Python (and many similar languages), the += operator on strings is a valid in-place concatenation, so the statement is perfectly valid. This option is factually incorrect about the code’s validity.
Option 3: 'Hello world!' — This matches the expected result: the original string 'Hello' plus the appended string ' world!' yields 'Hello world!'. The concatenation is performed exactly as written, so this is the correct outcome.
Option 4: 'Hello' — This would be the original value if the string were not modified, but the += operation adds ' world!' to the end, so the final value cannot remain just 'Hello'. This option ignores the concatenation step and is therefore incorrect.

2261 CS 0012 SEC1010 Final Quiz

What will be the value of the variable string after the following code executes? string = 'Hello' string += ' world!'

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