Trouble piping output from python script

Question

I am having trouble getting the output from a python script, that I didn't write, redirected to grep. Below are my experiments including the base cases. "myPythonCmd" is long running and streams to stdout.

Any suggestions?

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/myPythonCmd.py arg1 arg2

Outputs both stderr and stdout to the screen

/myPythonCmd.py arg1 arg2 2>/dev/null

Outputs just stdout to the screen

/myPythonCmd.py arg1 arg2 2>/dev/null > outputfile

Outputs nothing to the screen, but writes stdout to outputfile

/myPythonCmd.py arg1 arg2 2>/dev/null | grep searchTerm

Outputs NOTHING even though I know searchTerm is present.

/myPythonCmd.py arg1 arg2 2>/dev/null | grep --line-buffered searchTerm

Outputs NOTHING even though I know searchTerm is present.

Answer 1

python's -u option is what was needed. Thanks @PM_2Ring

python -u myPythonCmd.py arg1 arg2 2>/dev/null | grep searchTerm