Python：如果符合字符限制，如何打破循環？

我正在創建一個字符串，它必須完全是140個字符。我必須使用帶有break語句的循環，並且字符串項來自給定列表。Python：如果符合字符限制，如何打破循環？

最後，我設法達到了147個字符。有沒有辦法截斷字符串？

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 headline in headlines: 
    if len(str(news_ticker)) >= 140: 
     break 
    else: 
     news_ticker = list(news_ticker) 
     news_ticker.append(headline) 

print(news_ticker) 
print(len(str(news_ticker)))

來源

2017-10-07 Simas

news_ticker = news_ticker[:140]

將截斷字符串爲140個字符，如果這是你想要做什麼。

來源

2017-10-07 18:47:10 tehforsch

你的答案會返回news_ticker作爲列表，但它需要是一個字符串。它可以讓你使用.append功能，但你完全可以串連像這樣的字符串：

for headline in headlines: 
    news_ticker += headline + " " 
    if len(news_ticker) >= 140: 
     news_ticker = news_ticker[:140] 
     break

來源

2017-12-04 21:43:33 Emily

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 headline in headlines: 
    news_ticker += headline + " " 
    if len(news_ticker) >= 140: 
    news_ticker = news_ticker[:140] 
    break 


print(news_ticker)

來源

2018-01-10 08:08:53

Python：如果符合字符限制，如何打破循環？

回答

相關問題