What is a good practice to check if an environmental variable exists or not?

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Chapters
00:00 Question
00:45 Accepted answer (Score 272)
01:59 Answer 2 (Score 56)
03:35 Answer 3 (Score 28)
04:49 Answer 4 (Score 11)
05:07 Thank you

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Full question
https://stackoverflow.com/questions/4069...

Answer 1 links:
[ChainMap]: https://docs.python.org/3/library/collec...
[@Levon]: https://stackoverflow.com/a/54596068/439...

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Tags
#python #python27 #python3x #ifstatement #environmentvariables

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