Formula for correlation with if-condition in Python

Question

everyone!

I have a dataset, for instance, like this:

| A | B |  C |
| - | - | -  |
| 2 | 6 | 10 |
| 3 | 7 | 15 |
| 1 | 4 | 24 |
| 6 | 2 | 20 |
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