[oefrha]

Of course not, that would mean env vars are hard-coded into byte code at compile time, which would be completely crazy. A pyc file is just a parsed series of op codes that the interpreter could dispatch directly, so that it doesn't have to parse source files every single time.

It's very easy to verify:

secrets.py:

  import os
  SECRET = os.getenv('SECRET')

Then

  $ python -m compileall secrets.py
  $ uncompyle6 __pycache__/secrets.cpython-38.pyc
  # uncompyle6 version 3.7.0
  # Python bytecode 3.8 (3413)
  # Decompiled from: Python 3.8.2 (default, Mar 10 2020, 12:58:02)
  # [Clang 11.0.0 (clang-1100.0.33.17)]
  # Embedded file name: secrets.py
  # Compiled at: ...
  # Size of source mod 2**32: 40 bytes
  import os
  SECRET = os.getenv('SECRET')
  # okay decompiling __pycache__/secrets.cpython-38.pyc