CodeWars 刷题总结

CodeWars

Your order, please

Your task is to sort a given string. Each word in the String will contain a single number. This number is the position the word should have in the result.

Note: Numbers can be from 1 to 9. So 1 will be the first word (not 0).

If the input String is empty, return an empty String. The words in the input String will only contain valid consecutive numbers.

For an input: "is2 Thi1s T4est 3a" the function should return "Thi1s is2 3a T4est"

知识点

• python中filter方法的运用，版本不同返回值不同，如下所示：
  python2 -> filter(f, xs) == [x for x in xs if f(x)] (except that if xs is a string, it returns a string)
python3 -> filter(f, xs) == (x for x in xs if f(x))
• python中sorted方法的运用，可以指定排序的key函数(参数只能是一个)，和cmp比较函数，key可以是lambda匿名函数，key函数用的比较多