Tee does not show output or write to file

Here's a simpler way of reproducing your issue:

$ cat foo.pyfrom time import sleepwhile True:   sleep(2)  print "hello"$ python foo.pyhellohello    (...)$ python foo.py | tee log(no output)

This happens because python buffers stdout when it's not a terminal. The easiest way to unbuffer it is to use python -u:

$ python -u foo.py | tee loghellohello(...)

You can also set the shebang to #!/usr/bin/python -u (this does not work with env).

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