python-为什么我的代码没有附加所有电影？

我必须为学校做一个练习，但我做不到。任务如下：

定义函数；x“；这需要一个像上一个一样的目录和一个最喜欢的主题列表，并为涉及任何这些主题的电影生成建议。

目录如下：

example = [
 {"title": "The Hard Way", "themes": ["Action & Adventure"]},
 {"title": "Asmaa", "themes": ["Dramas", "International Movies"]},
 {"title": "Dukhtar", "themes": ["Dramas", "Independent Movies", "International Movies"]},
 {"title": "The Bachelorette", "themes": ["Reality TV", "Romantic TV Shows"]},
 {"title": "12 Years Promise", "themes": ["International TV Shows", "Korean TV Shows", "Romantic TV Shows"]},
 {"title": "Alexandria: Again and Forever", "themes": ["Classic Movies", "Dramas", "International Movies"]},
 {"title": "Road Trip: Beer Pong", "themes": ["Comedies"]},
 {"title": "Chashme Buddoor", "themes": ["Comedies", "International Movies", "Music & Musicals"]},
 {"title": "House Party 3", "themes": ["Comedies", "Music & Musicals"]},
 {"title": "Manhunt", "themes": ["Action & Adventure", "International Movies"]}
]

这是我到目前为止编写的代码：

def x(catalog,list):
  recomended = []
  for element in catalog:
    if list[0] in element["themes"]:
      list.append(recomended, element["title"])
  return recomended

它返回 ['Asmaa', 'Dukhtar', 'Alexandria: Again and Forever']，但它应该返回 ["Asmaa", "Dukhtar", "12 Years Promise", "Alexandria: Again and Forever"]。

我相信问题是因为我只检查主题中的第一个元素，但我不知道如何检查主题中的所有元素。