Python 中的Break和Continue

Python 中的Break 和 Continue

• break：控制何时循环应该结束
• continue： 跳过循环的一次迭代

Break 和 Continue[示例练习]

• 用 break 语句写一个循环，用于创建刚好长 140 个字符的字符串 news_ticker。你应该通过添加 headlines 列表中的新闻标题创建新闻提醒，在每个新闻标题之间插入空格。如果有必要的话，从中间截断最后一个新闻标题，使 news_ticker 刚好长 140 个字符

  headlines = ["Local Bear Eaten by Man",
              "Legislature Announces New Laws",
              "Peasant Discovers Violence Inherent in System",
              "Cat Rescues Fireman Stuck in Tree",
              "Brave Knight Runs Away",
              "Papperbok Review: Totally Triffic"]
  
  news_ticker = ""
  for item in headlines:
      news_ticker += item + " "
      if len(news_ticker) >= 140:
          news_ticker = news_ticker[:140]
          break
  
  print(news_ticker) # Local Bear Eaten by Man Legislature Announces New Laws Peasant Discovers Violence Inherent in System Cat Rescues Fireman Stuck in Tree Brave
  print(len(news_ticker)) # 140