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

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I want to check my environment for the existence of a variable, say "FOO", in Python. For this purpose, I am using the os standard library. After reading the library’s documentation, I have figured out 2 ways to achieve my goal:

Method 1: 

if "FOO" in os.environ:
    pass

Method 2:

if os.getenv("FOO") is not None:
    pass

I would like to know which method, if either, is a good/preferred conditional and why.

6 Answers
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