Eryk Sun added the comment: I've come across a few problems when passing a modified os.environ.copy() to a child process via subprocess.Popen. Ideally it shouldn't be an issue, as long as the OS or C runtime functions are used, but some troublesome programs do their own case-sensitive search for environment variables (definitely a bug). In such cases the simplest workaround is to use nt.environ.copy(), but this doesn't include any changes in the environment since startup.
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