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First repeated character and its index

EasyString Programs · 100 of 106

Write a Python program to find the first character that repeats and the index of its first occurrence.

Input

"sqatools"

Output

('o', 4)

Approach

Remember the first index of each character; stop at the first repeat.

Solution

Python

text = "sqatools"first_seen = {}for i, ch in enumerate(text):    if ch in first_seen:        print((ch, first_seen[ch]))        break    first_seen[ch] = i

Output

('o', 4)

Line by line

Lines 4-6

The first character seen twice is reported with the index where it first appeared.

Note

The loop finds the repeat at the second “o”, so the answer is (“o”, 4): “o” repeats before “s” does.

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