Dataframe根据某列字符串长度筛选行

data:dataframe

      rate	  _c2
 0    0.00	 1030111000000000000
 1    0.00    1070302150000000000
 2    0.06    3040801000000000000
 3    0.06                  70218
 4    0.09    1010115012700000000
 5    0.09    1010115039900000000
 6    0.10    1030210020000000000
 7    0.10    1060513040000000000
 8    0.11    1010112100000000000
 9    0.11    1030201020000000000

根据_c2长度过滤dataframe行

datafilter = data.loc[data['_c2'].str.len() > 5].reset_index()

datafilter:dataframe

	 rate	 _c2
0    0.00	 1030111000000000000
1    0.00    1070302150000000000
2    0.06    3040801000000000000
3    0.09    1010115012700000000
4    0.09    1010115039900000000
5    0.10    1030210020000000000
6    0.10    1060513040000000000
7    0.11    1010112100000000000
8    0.11    1030201020000000000