Can I fully replace GNU Bash with Python?

[Jason Hsu, Mr. Swift Linux]

This question concerns my process of creating Swift Linux from the
base distro (antiX Linux in the past, Linux Mint Debian Edition now).
(NOTE: The process I'm describing here is an oversimplification.)

All of my development work takes place in the ~/develop directory.
This is the directory where I enter the "git clone" command to
download the repositories from GitHub.  These repositories are 1-
build, majorfunction1, majorfunction2, and so on.  After I download
these repositories, I have the directories ~/develop/1-build, ~/
develop/majorfunction1, ~/develop/majorfunction2, and so on.

The ~/develop/1-build directory contains the scripts that build Swift
Linux.  Each major function needed to create Swift Linux (such as
changing web browser configuration files, changing login manager
configuration files, etc.) has its own majorfunction# repository.

For developing the latest version of Swift Linux, I had the swift.sh
script in the  ~/develop/1-build directory call scripts in the
majorfunction directories with commands like:
sh ~/develop/majorfunction1/main.sh
sh ~/develop/majorfunction2/main.sh
and so on

Please note that one can run any of these major functions
independently OR as part of the ~/develop/1-build/swift.sh script.
The ability to run any major function independently means I can focus
on just one function that's not working as it should WITHOUT messing
around with other functions.  This ability will be especially
important when I have an actual team working on Swift Linux.

What I'd like to do is replace GNU Bash with Python.  I know I can
replace the main.sh scripts with main.py scripts.  Then the commands
in the swift.sh script would be:
python ~/develop/majorfunction1/main.py
python ~/develop/majorfunction2/main.py
and so on

Is there a way I can replace the ~/develop/1-build/swift.sh script
with a ~/develop/1-build/swift.py script, yet still retain the ability
to work on one major function WITHOUT requiring the other major
functions and the 1-build directory to be present?