Difference between os.getenv and os.environ.get

One difference (observed in Python 2.7 and 3.8) between getenv() and environ[]:

• os.getenv() does not raise an exception, but returns None
• os.environ.get() similarly returns None
• os.environ[] raises an exception if the environmental variable does not exist

See this related thread. Basically, os.environ is found on import, and os.getenv is a wrapper to os.environ.get, at least in CPython.

EDIT: To respond to a comment, in CPython, os.getenv is basically a shortcut to os.environ.get ; since os.environ is loaded at import of os, and only then, the same holds for os.getenv.