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Antoine Pitrou authored and Krisztián Szűcs committed 7adcb7eafd2
ARROW-6954: [Python] [CI] Add Python 3.8 to CI matrix Also use a separate conda environment rather than installing everything in the base conda environment, as conda can complain about conflicts. Closes #5877 from pitrou/ARROW-6954-py38-ci and squashes the following commits: 0f411a482 <Krisztián Szűcs> Remove pandas master build for python 2.7 because pandas has already dropped support 9924be5bd <Krisztián Szűcs> Fix argument validation for install scripts 0ef0ae453 <Krisztián Szűcs> Fix conda-r image 5737cddd5 <Krisztián Szűcs> Missing CONDA_PREFIX 7b6bd7c14 <Krisztián Szűcs> Use a default conda environment other than base e620b3b3f <Antoine Pitrou> ARROW-6954: Add Python 3.8 to CI matrix Lead-authored-by: Antoine Pitrou <antoine@python.org> Co-authored-by: Krisztián Szűcs <szucs.krisztian@gmail.com> Signed-off-by: Krisztián Szűcs <szucs.krisztian@gmail.com>