Re: About python while statement and pop()

[Mark H Harris]

On 6/11/14 10:12 PM, hito koto wrote:

i want to change this is code:

def foo(x):
     y = []
     while x !=[]:
         y.append(x.pop())
     return y

Consider this generator (all kinds of permutations on the idea):

>>> L1
[1, 2, 3, 4, 5, 6, 7]

>>> def poplist(L):
        while True:
                yield L[::-1][:1:]
                L = L[::-1][1::][::-1]

                
>>> pop = poplist(L1)

>>> next(pop)
[7]
>>> next(pop)
[6]
>>> next(pop)
[5]
>>> next(pop)
[4]
>>> next(pop)
[3]
>>> next(pop)
[2]
>>> next(pop)
[1]
>>> next(pop)
[]
>>> next(pop)
[]


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