"小楼听雨"<hailang_0512 at 163.com> wrote:

> def foo(par=[]):
>     if par is None:

这一句不为真

>         par = []
>         par.append(0)
>     print par
>
> foo()
> print foo.func_defaults
>
> foo()
> print foo.func_defaults
>
> foo([9])
> print foo.func_defaults
>
> foo()
> print foo.func_defaults
>
> 结果是：
> []         
> ([],) #为什么不是（[0]，）
> []
> ([],)
> [9]
> ([],)
> []
> ([],)
>  难道是par.append(0)的问题？
> 　　
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Dryice @ http://dryice.3322.org

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