按字符串长度排序字符串列表

Question

words = ["dog", "apple", "bear"]
def len_words(words):
        w1 = []
      for p in words:
          w1.append(len(p))
          pass
for p in words:
       words.sort(key=len_words)

我尝试按此代码排序。但我的结果与给定的输入相同。它没有排序。

Answer 1

这应该有效：

words = ["dog", "apple", "bear"]    
words.sort(key=len)

Answer 2

无需定义自己的长度函数，只需使用key=len使用built-in len function按长度排序;

>>> words = ["dog", "apple", "bear"]
>>> words.sort(key=len)
>>> words
['dog', 'bear', 'apple']