dst_address   dst_enforcement   fwd_count ...
1  1.2.3.4       [Any,core]        8
2  3.4.5.6       []                9
3  6.7.8.9       [Any]             10
4  8.10.3.2      [core]            0

col_groups = df.columns.to_series().groupby(df.dtypes).groups
non_numeric_cols = col_groups[np.dtype('O')]