Fix ImportError by not importing aggregation when importing datapackage

oemof / oemof-tabular

Load oemof energy systems from tabular data sources.

https://oemof-tabular.readthedocs.io/

BSD 3-Clause "New" or "Revised" License

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Fix ImportError by not importing aggregation when importing datapackage #49

Closed jnnr closed 2 years ago

jnnr commented 2 years ago

When importing oemof.tabular.datapackage, aggregation is imported via datapackage/init.py, which gives an ImportError when the extra requirement "tsam" is not installed. Aggregation should only be imported when imported explicitly.

Fixes a failing test in https://github.com/rl-institut/oemoflex/pull/74