Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.python > #73203

Re: About python while statement and pop()

Show all headers | View raw

2014年6月12日木曜日 12時58分27秒 UTC+9 Chris Angelico:
> On Thu, Jun 12, 2014 at 1:40 PM, Vincent Vande Vyvre
> 
> <vincent.vandevyvre@swing.be> wrote:
> 
> > Le 12/06/2014 05:12, hito koto a écrit :
> 
> >
> 
> >> Hello,all
> 
> >> I'm first time,
> 
> >>
> 
> >> I want to make a while statement which can function the same x.pop () and
> 
> >> without the use of pop、how can i to do?
> 
> >>
> 
> >> i want to change this is code:
> 
> >>
> 
> >> def foo(x):
> 
> >>      y = []
> 
> >>      while x !=[]:
> 
> >>          y.append(x.pop())
> 
> >>      return y
> 
> >
> 
> > Something like that :
> 
> >
> 
> > def foo(x):
> 
> >     return reversed(x)
> 
> 
> 
> That doesn't do the same thing, though. Given a list x, the original
> 
> function will empty that list and return a new list in reverse order,
> 
> but yours will return a reversed iterator over the original list
> 
> without changing it. This is more accurate, but still not identical,
> 
> and probably not what the OP's teacher is looking for:
> 
> 
> 
> def foo(x):
> 
>     y = x[::-1]
> 
>     x[:] = []
> 
>     return y
> 
> 
> 
> If the mutation of x is unimportant, it can simply be:
> 
> 
> 
> def foo(x):
> 
>     return x[::-1]
> 
> 
> 
> ChrisA


I want to use while statement,

for example:
>>> def foo(x):
...     y = []
...     while x !=[]:
...         y.append(x.pop())
...     return y
...
>>> print foo(a)
[[10], [5, 6, 7, 8, 9], [1, 2, 3, 4]]
>>> a
[]   but this is empty　
>>> so,I want to leave a number of previous (a = [[1, 2, 3, 4],[5, 6, 7, 8, 9],[10]])

Back to comp.lang.python | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

About python while statement and pop() hito koto <hitokoto2014@gmail.com> - 2014-06-11 20:12 -0700
  Re:About python while statement and pop() Dave Angel <davea@davea.name> - 2014-06-11 22:34 -0500
  Re: About python while statement and pop() Vincent Vande Vyvre <vincent.vandevyvre@swing.be> - 2014-06-12 05:40 +0200
  Re: About python while statement and pop() Chris Angelico <rosuav@gmail.com> - 2014-06-12 13:58 +1000
    Re: About python while statement and pop() hito koto <hitokoto2014@gmail.com> - 2014-06-11 21:56 -0700
      Re: About python while statement and pop() Chris Angelico <rosuav@gmail.com> - 2014-06-12 15:08 +1000
      Re: About python while statement and pop() Steven D'Aprano <steve@pearwood.info> - 2014-06-12 05:43 +0000
        Re: About python while statement and pop() hito koto <hitokoto2014@gmail.com> - 2014-06-11 23:06 -0700
        Re: About python while statement and pop() hito koto <hitokoto2014@gmail.com> - 2014-06-12 00:13 -0700
        Re: About python while statement and pop() hito koto <hitokoto2014@gmail.com> - 2014-06-12 02:51 -0700
  Re: About python while statement and pop() Mark H Harris <harrismh777@gmail.com> - 2014-06-12 11:41 -0500
  Re: About python while statement and pop() Mark H Harris <harrismh777@gmail.com> - 2014-06-12 11:49 -0500
    Re: About python while statement and pop() Marko Rauhamaa <marko@pacujo.net> - 2014-06-12 19:55 +0300
      Re: About python while statement and pop() Mark H Harris <harrismh777@gmail.com> - 2014-06-12 12:07 -0500
    Re: About python while statement and pop() Chris Angelico <rosuav@gmail.com> - 2014-06-13 02:57 +1000
      Re: About python while statement and pop() Mark H Harris <harrismh777@gmail.com> - 2014-06-12 12:10 -0500
      Re: About python while statement and pop() Mark H Harris <harrismh777@gmail.com> - 2014-06-12 12:16 -0500
        Re: About python while statement and pop() wxjmfauth@gmail.com - 2014-06-12 11:37 -0700

csiph-web