I got three UTF-8 stings:

hello, world
hello, ??
hello, ?rld

I only want the first 10 chars so that the bracket in one column:

[hello, wor]
[hello, ? ]
[hello, ?r]

In console:

width('??')==width('worl')
width('? ')==width('wor')  #a white space behind '?'

python's format() doesn't help when UTF-8 chars mixed in

>>> for s in ['[{0:<{1}.{1}}]'.format(s, 10) for s in ['hello, world', 'hello, ??', 'hello, ?rld']]:
...    print(s)
...
[hello, wor]
[hello, ?? ]
[hello, ?rl]

So, I wonder if there is a standard way to do the UTF-8 padding staff?