[Tutor] List Methods, String Slices and For loops

[Developer Ecofunds]

Soory by the new message with same question. The goup said my subject was
messy and the previous message was denied. Please ignore.

2012/6/25 Developer Ecofunds <ecofunds.developer at gmail.com>

> Hello guys,
>
> I'd like to ask you a little question about a script I did and isn't
> working properly.
> It is one excercise from googles python classes <
> http://code.google.com/edu/languages/google-python-class/set-up.html>
>
> I'm using python 2.5 because it's the one works with Google App Engine <
> https://developers.google.com/appengine/docs/python/gettingstarted/>
>
> This is the problem:
>
> ##########################3
>
> # B. front_x
> # Given a list of strings, return a list with the strings
> # in sorted order, except group all the strings that begin with 'x' first.
> # e.g. ['mix', 'xyz', 'apple', 'xanadu', 'aardvark'] yields
> # ['xanadu', 'xyz', 'aardvark', 'apple', 'mix']
> # Hint: this can be done by making 2 lists and sorting each of them
> # before combining them.
>
> # This is the code I did -- Romulo.
>
> def front_x(words):
>   x_list = []
>   for string in words:
>     if string[0]=='x':
>       x_list.append(string)
>       words.remove(string)
>   sorted(words)
>   sorted(x_list)
>   x_list.extend(words)
>   return x_list
>
> ##############################
>
> The problem with this code is that it only gets the first word beginning
> with x and the others remaisn on the original list, sorted at the end. I've
> tested on terminal many parts of the code and it whas fine, but when I run
> it complete, it does not work.
>
> Following is the solution of the problem. I can understand it, I just
> can't understand why my code does not work.
>
> #############################
> def front_x(words):
>   x_list = []
>   other_list = []
>   for w in words:
>     if w.startswith('x'):
>       x_list.append(w)
>     else:
>       other_list.append(w)
>   return sorted(x_list) + sorted(other_list)
> ##############################
>
> To download all the exercises, access:
> http://code.google.com/edu/languages/google-python-class/google-python-exercises.zip
>
>
> Thank y'all.
>
>
>
>
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