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I believe this method name should be `wait_for_build`. Even though it reads quite well, as a client I would expect this to handle many objects, while the method can handle only builds at the moment.

:+1: for `check_interval`: I chose an arbitrary value, which is not necessarily *right*. I would convert it into a keyword argument, though:

```diff
- def wait_for(build, check_interval = 5)
+ def wait_for_build(build, poll_interval: 5)
```