About python while statement and pop()

[wxjmfauth at gmail.com]

Le jeudi 12 juin 2014 19:16:19 UTC+2, Mark H. Harris a écrit :
> On 6/12/14 11:57 AM, Chris Angelico wrote:
> 
> >>>>> def poplist(L):
> 
> >>          done = False
> 
> >>          while done==False:
> 
> >>
> 
> >>                  yield L[::-1][:1:]
> 
> >>                  L = L[::-1][1::][::-1]
> 
> >>                  if len(L)==0: done=True
> 
> >
> 
> > Why not just "while L"?
> 
> 
> 
> OK,  here it is with Chris' excellent advice:
> 
> 
> 
>  >>> def poplist(L):
> 
> 	while L:
> 
> 		yield L[::-1][:1:]
> 
> 		L = L[::-1][1::][::-1]
> 
> 
> 
> 		
> 
>  >>> L=[1, 2, 3, 4, 5, 6, 7]
> 
>  >>> m=[]
> 
>  >>> pop = poplist(L)
> 
>  >>> for n in poplist(L):
> 
> 	m.append(n[0])
> 
> 
> 
> 	
> 
>  >>> m
> 
> [7, 6, 5, 4, 3, 2, 1]
> 
>  >>>
> 
> 
> 
> 
> 
> ==========  aaaaah  ===================

>>> a = [1, 2, 3, 4, 5, 6, 7]
>>> b = a[:]  # si nécessaire, wenn nötig
>>> b.reverse()
>>> 
>>> a
[1, 2, 3, 4, 5, 6, 7]
>>> b
[7, 6, 5, 4, 3, 2, 1]

jmf