在Python中从嵌套字典中获取键的绝对路径

def get_key_path(dictionary, target_key, current_path=''):
    for key, value in dictionary.items():
        new_path = current_path + '.' + str(key) if current_path else str(key)
        if key == target_key:
            return new_path
        elif isinstance(value, dict):
            result = get_key_path(value, target_key, new_path)
            if result:
                return result
    return None

nested_dict = {
    'a': {
        'b': {
            'c': 1,
            'd': 2
        },
        'e': {
            'f': {
                'g': 3
            }
        }
    },
    'h': {
        'i': 4
    }
}

target_key = 'g'
result = get_key_path(nested_dict, target_key)
print(result)  # 输出：a.e.f.g