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

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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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