`scm` file parsing(read/write/modify)

[Hamzeh Nasajpour]

Hi,
I have a configuration file that written based on `scm` file like as `guixSD` 
config.scm file.
https://www.gnu.org/software/guix/manual/en/html_node/User-Accounts.html#User-Accounts


I want to read/write/modify this config file in python or C/C++.
Do you know any `scm` file parsing  or any other solution for my needed? In 
fact I want to add/remove/modify parameters of this config file.

Regards,
Hamzeh