Which place is it?
It is a field.
     src       edge_attr  dst
0      0  to the left of   15
1      0  to the left of   14
2      0  to the left of   18
3      0  to the left of   16
4      1  to the left of   18
..   ...             ...  ...
96    20  to the left of    8
97    20  to the left of   14
98    20  to the left of   13
99    20  to the left of   18
100   21  to the left of   14

[101 rows x 3 columns]