如何统计字符串中重复字符的实例？

def count_duplicate_chars(string):
    char_count = {}
    for char in string:
        if char in char_count:
            char_count[char] += 1
        else:
            char_count[char] = 1
    
    duplicate_chars = {}
    for char, count in char_count.items():
        if count > 1:
            duplicate_chars[char] = count
    
    return duplicate_chars

# 示例用法
string = "hello world"
result = count_duplicate_chars(string)
print(result)

{'l': 3, 'o': 2}