os.spawnlpe()
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os.
spawnlpe
(mode, file, *args, env) → integer[source]¶ Execute file (which is looked for along $PATH) with arguments from args in a subprocess with the supplied environment. If mode == P_NOWAIT return the pid of the process. If mode == P_WAIT return the process’s exit code if it exits normally; otherwise return -SIG, where SIG is the signal that killed it.