[Python-Dev] startup time repeated? why not daemon

[Jim J. Jewett]

I agree that startup time is a problem, but I wonder if some of the pain
could be mitigated by using a persistent process.

For example, in
https://mail.python.org/pipermail/python-dev/2017-July/148664.html Ben Hoyt
mentions that the Google Cloud SDK (CLI) team has found it "especially
problematic for shell tab completion helpers, because every time you press
tab the shell has to load your Python program"

Decades ago, I learned to set my editor to vi instead of emacs for similar
reasons -- but there was also an emacsclient option that simply opened a
new window from an already running emacs process.  tab completion seems
like the exactly the sort of thing that should be sent to an existing
process instead of creating a new one.

Is it too hard to create a daemon server?
Is the communication and context switch slower than a new startup?
Is the pattern just not well-enough advertised?

-jJ
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