Issue when converting from camel case to snake case for python generation

I have a parameter that called `imageURL`
and its converted to `image_u_r_l`

Also happening for file names, for example `notrixSDK` becomes `notrix_s_d_k.py`

No files or tests are named. Start by locating the Python generation path and the camel-case-to-snake-case conversion used for parameters and file names, then reproduce the issue with imageURL and notrixSDK. Done means those names no longer split each uppercase letter into a separate underscore-delimited segment.

Written by the indexing model from the issue text.