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Pants

Hmm… why is this not compatible? [SOLVED]
```You have set interpreter constraints (`CPython&lt;4 OR CPython&gt;=3.6.*`) that are not compatible with those used to generate the lockfile (`CPython&lt;4,&gt;=3.6`). `flake8` determines its interpreter constraints```

For symmetry, it would make sense if the `C1, C2` where presented as `C1 AND C2` to match the `OR` case… that would be clearer :slightly_smiling_face:

The tricky thing is we probably want to preserve how you wrote them in your pants.toml, e.g. so you can grep it

```[python]
interpreter_constraints = ["&gt;=3.6,&lt;4", "==2.7.*"]```
We  use `' OR '.join()`

I think grep-ability is less important than conceptual clarity in the error message, imo.