使用嵌套循环 - for 循环

Question

我有 2 个关于使用嵌套循环的问题。

1. 我正在对 football_match 进行迭代，以创建一个包含每支球队颜色的新列表。到目前为止，我已经

colors = []

for color in soccer_match:
    colors.append(color['colors'])

colors

这给了我 [['blue', 'white', 'red'], ['green', 'gold']]。我如何能够将两个列表合并为一个？我还没有学习列表理解或函数。

1. 如何遍历 football_match 以创建一个仅包含每支球队队长的列表？我假设我应该使用嵌套的 for 循环来查找 'captain' = True 但不知道如何放置该代码。

这是给定的示例。谢谢！

soccer_match = [
  { "home_team": True,
    "away_team": False,
    "country": "France",
    "num_passes": 484,
    "passes_completed": 423,
    "fouls_committed": 16,
    "colors": ["blue", "white", "red"],
    "players": [
      {
        "name": "Hugo LLORIS",
        "captain": True,
        "shirt_number": 1,
        "position": "Goalie"
      },
      {
        "name": "Benjamin PAVARD",
        "captain": False,
        "shirt_number": 2,
        "position": "Defender"
      },
      {
        "name": "Raphael VARANE",
        "captain": False,
        "shirt_number": 4,
        "position": "Defender"
      },
      {
        "name": "Samuel UMTITI",
        "captain": False,
        "shirt_number": 5,
        "position": "Defender"
      },
      {
        "name": "Paul POGBA",
        "captain": False,
        "shirt_number": 6,
        "position": "Midfield"
      },
      {
        "name": "Antoine GRIEZMANN",
        "captain": False,
        "shirt_number": 7,
        "position": "Forward"
      },
      {
        "name": "Kylian MBAPPE",
        "captain": False,
        "shirt_number": 10,
        "position": "Forward"
      },
      {
        "name": "Ousmane DEMBELE",
        "captain": False,
        "shirt_number": 11,
        "position": "Forward"
      },
      {
        "name": "Corentin TOLISSO",
        "captain": False,
        "shirt_number": 12,
        "position": "Midfield"
      },
      {
        "name": "Ngolo KANTE",
        "captain": False,
        "shirt_number": 13,
        "position": "Midfield"
      },
      {
        "name": "Lucas HERNANDEZ",
        "captain": False,
        "shirt_number": 21,
        "position": "Defender"
      }
    ],
  },
  { "home_team": False,
    "away_team": True,
    "country": "Australia",
    "num_passes": 390,
    "passes_completed": 332,
    "fouls_committed": 19,
    "colors": ["green", "gold"],
    "players": [
      {
        "name": "Mathew RYAN",
        "captain": False,
        "shirt_number": 1,
        "position": "Goalie"
      },
      {
        "name": "Mark MILLIGAN",
        "captain": False,
        "shirt_number": 5,
        "position": "Defender"
      },
      {
        "name": "Mathew LECKIE",
        "captain": False,
        "shirt_number": 7,
        "position": "Forward"
      },
      {
        "name": "Robbie KRUSE",
        "captain": False,
        "shirt_number": 10,
        "position": "Forward"
      },
      {
        "name": "Andrew NABBOUT",
        "captain": False,
        "shirt_number": 11,
        "position": "Forward"
      },
      {
        "name": "Aaron MOOY",
        "captain": False,
        "shirt_number": 13,
        "position": "Midfield"
      },
      {
        "name": "Mile JEDINAK",
        "captain": True,
        "shirt_number": 15,
        "position": "Midfield"
      },
      {
        "name": "Aziz BEHICH",
        "captain": False,
        "shirt_number": 16,
        "position": "Defender"
      },
      {
        "name": "Joshua RISDON",
        "captain": False,
        "shirt_number": 19,
        "position": "Defender"
      },
      {
        "name": "Trent SAINSBURY",
        "captain": False,
        "shirt_number": 20,
        "position": "Defender"
      },
      {
        "name": "Tom ROGIC",
        "captain": False,
        "shirt_number": 23,
        "position": "Midfield"
      }
    ]
  }
]

Answer 1

将colors.append 替换为colors.extend。

Answer 2

您应该根据变量所代表的内容来命名变量。在这种情况下，soccer_match 的每个元素都代表一个团队。

现在对于每个团队，team['colors'] 是一个列表。例如，第一队有team['colors'] = ["blue", "white", "red"]。由于您想将此列表的所有元素添加到您的主 colors 列表中，请使用 lst.extend(x) 方法从给定列表 x 中将所有元素添加到当前列表 lst。 lst.append(x) 将整个列表 x 作为单个元素添加到 lst。见documentation

要找到队长，请遍历每支球队的所有球员。如果该玩家的'captain' 键是True，则将该玩家附加到captains 列表中。

colors = []
captains = []

for team in soccer_match:
    colors.extend(team['colors'])
    for player in team['players']:
        if player['captain']:
            captains.append(player)