预测查找函数的返回

运行下面的 Python 3 程序，填写结果。

def find_by_name(people, name):
    for p in people:
        if p["name"] == name:
            return p["city"]
    return None

people = [{"name": "小明", "city": "北京"},
          {"name": "小红", "city": "上海"},
          {"name": "小刚", "city": "北京"}]
print(find_by_name(people, "小红"))