This line is really too long even for the most optimistically wide editor window. IMO, you should move that dict out to the lines above the for loop, like this:

```python
dep_dict = {
    'build': self.build_depends,
    'build_export': self.build_export_depends,
    'buildtool': self.buildtool_depends,
    'buildtool_export': self.buildtool_export_depends,
    'doc': self.doc_depends,
    'exec': self.exec_depends,
    'test': self.test_depends,
}
for dep_type, depends in dep_dict.items():
```