On 4/10/2014 9:54 AM, length power wrote:
>>> x=['','x1','x2','x3',' ']
>>> x
['', 'x1', 'x2', 'x3', ' ']
>>> [print("ok") for it in x if it.strip() !=""]
Don't use comprehensions for side effects. To get what you want, just
write normal code.
for it in x:
if it.strip() != '':
print('ok')
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]
Reread the ref manual section on comprehensions.
--
Terry Jan Reedy
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