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dexter has posted comments on this change by dexter. ( https://gerrit.osmocom.org/c/pysim/+/37839?usp=email )

Change subject: pySim-shell: prevent opening/closing logical channel 0 ......................................................................

Patch Set 3:

(1 comment)

File pySim-shell.py:

https://gerrit.osmocom.org/c/pysim/+/37839/comment/837e1afd_efcef345?usp=ema... : PS1, Line 974: raise RuntimeError("Cannot create (always existing) basic logical lchan 0")

Id'd have assumed raising a ValueError is more correct, as it's a wrong value. […]

I think restricting the value range at argparse level is the most effecting option.