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Pythonで環境変数を取得する、なければデフォルト値をセットする

概要

pythonを使う時に、環境変数があれば、その値、なければ、デフォルト値をセットしたい

結論

Access environment variables from Python

import os

url = os.getenv("YOUR_URL", "http://qiita.com")
print(url)

os.environ.get

os.environ は、mapのようなので、

docker で試す場合

$ docker run -v $PWD:/work --rm python:2.7.12 python /work/sample.py
http://qiita.com
$ docker run -e YOUR_URL="http://127.0.0.1" -v $PWD:/work --rm python:2.7.12 python /work/sample.py
http://127.0.0.1
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32
Help us understand the problem. What are the problem?