The YAML loading process is using a deprecated form of yaml.load.
/usr/local/lib/python3.6/site-packages/webassets/loaders.py:162: YAMLLoadWarning:
*** Calling yaml.load() without Loader=... is deprecated.
*** The default Loader is unsafe.
*** Please read https://msg.pyyaml.org/load for full details.
obj = self.yaml.load(f) or {}
The YAML loading process is using a deprecated form of yaml.load.
Fixing this warning is as simple as described here https://github.com/yaml/pyyaml/wiki/PyYAML-yaml.load(input)-Deprecation#how-to-disable-the-warning
I open this issue to discuss which loader should we use, probably SafeLoader but I'm not sure.