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How to use 'find repeated characters in a string python' in Python

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dbader/data-structures-py
14def first_non_repeated_character(s):
15    """O(2n) == O(n)"""
16    char_count_map = collections.defaultdict(lambda: 0)
17    for ch in s:  # O(n)
18        char_count_map[ch] += 1
19    for ch in s:  # O(n)
20        if char_count_map[ch] == 1:
21            return ch
22    return None

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