[Tutor] using a for loop in another method

[Tim Golden]

On 22/04/2016 17:08, Rene.Castillo wrote:
> Hi, this is my first post on this mailing list-
>
> I wanted to ask about this type of execution in python,
>
> expected output-
> reverse_words("This is an example!") # returns  "sihT si na !elpmaxe"
>
>
> below is my execution, followed by another persons execution, which i dont
> completely understand.
>
> def reverse_words(strng):
>    strng = strng[::-1].split(' ')
>    strng.reverse()
>    return ' '.join(strng)
>
>
> def reverse_words(s)
>      return ' '.join(s[::-1] for s in str.split(' '))
>
>
>
> how can a for loop be called within another method like that- and possibly
> what situations does this benefit
> i don't even know how to google this sort of thing
> any words are appreciated-

It's tricky, isn't it? Once I give you the magic phrase, you'll find 
examples and explanations all over the place:

   list comprehension

(strictly, the example you're showing is a "generator comprehension" but 
you'll probably get more hits for the slightly older "list comprehension").

TJG