按路径获取字典键(字符串)

def get_value_by_path(dictionary, path):
    if not isinstance(dictionary, dict):
        return None
    
    keys = path.split('.')  # 根据点号分隔路径
    current_dict = dictionary
    
    for key in keys:
        if key not in current_dict:
            return None
        current_dict = current_dict[key]
    
    return current_dict

data = {
    'person': {
        'name': 'Alice',
        'age': 25,
        'address': {
            'city': 'New York',
            'street': '123 ABC Street'
        }
    }
}

result = get_value_by_path(data, 'person.name')
print(result)  # 输出：Alice

result = get_value_by_path(data, 'person.address.city')
print(result)  # 输出：New York