Are there any shoppers in the market?
Yes, there is a shopper in the market.
     src        edge_attr  dst
0      0               on    2
1      0  to the right of   10
2      0  to the right of    5
3      1   to the left of   18
4      1               on    2
..   ...              ...  ...
162   37   to the left of   39
163   39  to the right of   37
164   40  to the right of   13
165   40   to the left of   35
166   40  to the right of    7

[167 rows x 3 columns]