小编Don*_*ong的帖子

这是我的样子DataFrame:

   StateAb    GivenNm    Surname                  PartyNm PartyAb  ElectedOrder
35      WA        Joe    BULLOCK   Australian Labor Party     ALP             2
36      WA  Michaelia       CASH                  Liberal      LP             3
37      WA      Linda   REYNOLDS                  Liberal      LP             4
38      WA      Wayne  DROPULICH  Australian Sports Party    SPRT             5
39      WA      Scott     LUDLAM          The Greens (WA)     GRN             6

我想列出姓氏长度超过9个字符的参议员名单.

所以我认为代码应该是这样的:

df[len(df.Surname) > 9]

但这提出了一个KeyError,我哪里出错了？