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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