>>> '+'.join('1234')
'1+2+3+4'
>>> '+'.join(a for a in '1234')
'1+2+3+4'
>>> '+'.join(a for a in '1234' if a=='2')
'2'
>>> '+'.join(sorted('4+2+1+3'[::2]))
'1+2+3+4'
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>>> '+'.join('1234')
'1+2+3+4'
>>> '+'.join(a for a in '1234')
'1+2+3+4'
>>> '+'.join(a for a in '1234' if a=='2')
'2'
>>> '+'.join(sorted('4+2+1+3'[::2]))
'1+2+3+4'
相关文章：