$ python tee_test.py [stdout] hello [stderr] hello [stdout] world [stderr] world [stdout] not going to be written to file [stderr] not going to be written to file $ cat mystdout.txt [stdout] hello ...

There should be a convenient and standard way to read and write from the trio process's stdin/stdout/stderr streams. (Note that this is different from talking to the stdin/stdout/stderr of child ...