GCP Dataflow pipeline with mapreduce in python
as per https://codelabs.developers.google.com/codelabs/cpb101-mapreduce-dataflow-py
and per https://www.udemy.com/gcp-data-engineer-and-cloud-architect/learn/v4/t/lecture/7598622?start=0
and per https://github.com/GoogleCloudPlatform/training-data-analyst/tree/master/courses/data_analysis/lab2/python
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pip install google-cloud-dataflow oauth2client==3.0.0
for local deploy
feed correct path with --input
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for dataflow deploy
reads and writes to Cloud Storage bucket
note BUCKET_ID & PROJECT_ID vars \