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GO Classes DPP | GATE DA | Python & DSA | Insert Items

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2 2 votes

Consider the following Python code:

def insert_items(s, before, after):
    index = 0
    while index < len(s):
        if s[index] == before:
            s.insert(index + 1, after)
            index += 1
        index += 1
    return s

large_s = [1, 4, 8]

large_s2 = insert_items(large_s, 4, 4)
large_s3 = insert_items(large_s2, 4, 6)

print(large_s3)
print(large_s3 is large_s)

What is the output of the code above?

  1. [1, 4, 6, 4, 6, 8]
True
  2. [1, 4, 4, 8]
True
  3. [1, 4, 6, 4, 8]
True
  4. [1, 4, 6, 6, 4, 8]
False

2 Answers

0 0 votes

Initially:

large_s = [1, 4, 8]

First call:

large_s2 = insert_items(large_s, 4, 4)

This inserts $4$ after every existing $4$.

large_s = [1, 4, 4, 8]

Now second call:

large_s3 = insert_items(large_s2, 4, 6)

This inserts $6$ after each $4$.

large_s3 = [1, 4, 6, 4, 6, 8]

The function modifies the same original list in place, so:

large_s3 is large_s

is $\texttt{True}$.

Final output:

[1, 4, 6, 4, 6, 8]
True
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