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Remove hard pandas dependency for melt by using methodcaller #4719
Summary of Changes
This closes #4718 .
Melt test is failing on travis-CI due to pandas 0.19.2. Melt was introduced as a DataFrame method in pandas version 0.20.0. It passes appveyor due to that build having pandas 0.20.3.
I'm able to pass locally in the following environment, which was created with a fresh python3 virtual environment followed by
Dask's setup.py seems to indicate that pandas >= 0.19.0 should work with dask. Is maintaining 0.19 compatibility necessary?