About python while statement and pop()

[hito koto]

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
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