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Date: Thu, 10 Apr 2014 15:59:48 +0200
From: Johannes Schneider <johannes.schneider@galileo-press.de>
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Subject: Re: why i have the output of [None, None, None]
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Xref: csiph.com comp.lang.python:70042

because thats the return value of [...]
print retuns None.

On 10.04.2014 15:54, length power wrote:
>  >>> x=['','x1','x2','x3','   ']
>  >>> x
> ['', 'x1', 'x2', 'x3', '   ']
>  >>> [print("ok") for it in x if it.strip() !=""]
> ok
> ok
> ok
> [None, None, None]
>
> i understand there are three 'ok' in the output,but why i have the
> output of [None, None, None]
>
>


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