Mininero is a python implementation of monero. But the git repository is three years old where the latest link does not have any content. Is there any other python implementation of monero where code for LSAG and ringCT is available?
I've implemented the Monero transaction code signing for the Trezor in python, the code is here:
And MLSAG in particular: https://github.com/ph4r05/monero-agent/blob/master/monero_glue/xmr/mlsag2.py
The python implementation also contains pure-python Bulletproofs implementation.
Mininero has a python implementation of RingCT. I wouldn't rely on it being up-to-date with Monero's core implementation as if I recall correctly, it's purpose was originally a testbed of RingCT before it was implemented in Monero proper. Useful still for academic purposes nonetheless.