Expected behaviour:

flexget should just work for python3 without pathtlib installed, given it's arealdy part of python3, and also because it's on maitainance mode only. If needing extra libs, pathlib2 should be a better match...

https://pathlib.readthedocs.io/en/1.0.1

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This module has been included in the Python 3.4 standard library after PEP 428 acceptance. You only need to install it for Python 3.3 or older.
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Actual behaviour:

However, flexget always complains with:

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pkg_resources.DistributionNotFound: The 'pathlib>=1.0' distribution was not found and is required by FlexGet
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If ptyhon3 pathlib is not present...

Additional information:

• FlexGet version: 2.10.14
• Python version: 3.6.1
• Installation method: python.setup
• Using daemon (yes/no): no
• OS and version: Arch GNU/Linux