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

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def first_non_repeated_character(s):
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    """O(2n) == O(n)"""
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    char_count_map = collections.defaultdict(lambda: 0)
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    for ch in s:  # O(n)
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        char_count_map[ch] += 1
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    for ch in s:  # O(n)
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        if char_count_map[ch] == 1:
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            return ch
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    return None

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def remove_repeats(string, n, join=True):
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    count = 0
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    output = []
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    last = ''
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    for c in string:
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        if c == last:
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            count = count + 1
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        else:
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            count = 0
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            last = c
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        if count < n:
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            output.append(c)
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    if join:
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        return "".join(output)
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    return output