eryksun added the comment:
Defaulting to just "cmd.exe" can execute an arbitrary program named "cmd.exe"
in the application directory or current directory.
When CreateProcess needs to find the shell to execute a batch file (.bat or
.cmd), it doesn't search for "cmd.exe" -- at least not in NT 6. If ComSpec
isn't set, it defaults to "%SystemRoot%\system32\cmd.exe". If both ComSpec and
SystemRoot are unset, executing a batch file via CreateProcess fails with
ERROR_DIRECTORY.
I think Python should use the same default path if it's ignoring ComSpec:
default_shell = path.join(environ["SystemRoot"], "system32", "cmd.exe")
A KeyError shouldn't be a problem here. CPython won't even run if SystemRoot
isn't set to the correct path:
C:\>set SystemRoot=
C:\>py -3
Fatal Python error: Failed to initialize Windows random API (CryptoGen)
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