Hello Neels,

just now I'm trying to use pySim to read a SIM card, but I notice: ImportError: No module named pytlv.TLV

I can find no pytlv in the debian packaging; and I notice this dependency was added only recently. When going back to 859e0fd1ce08699930064c12fb9f7908ef972b50 I can use pySim fine without that.

Yes, there is no debian package. Those packages have to be installed using python-pip.

a) I think the readme should hint at dependencies that pySim requires, which should include pytlv and where to find it.

I have added pyscard and pytlv notes to the readme but I am not sure if this is really all. https://gerrit.osmocom.org/#/c/pysim/+/10046/

b) In python, it is easy to import pytlv only in case it is actually used, which would simplify dependencies for users that don't need to "get file/record length from FCP (USIM)" -- would that make sense?

I have tried it out, syomoUSIM-SJS1 currently does not have to look at card responses.

I have no experience with optional imports, you mean we should do it like this? https://gerrit.osmocom.org/#/c/pysim/+/10048/

best regards, Philipp