I have a python file:

def do_something():
    pass

def main():
    a = 1
    b = 2
    c = a+b
    print(f"c:{c}")
    pass

if __name__ == '__main__':
    main()

I run this command:

python -m pdb -c "b 5" -c "commands 1;;do_something();;end" -c "c" main.py

It doesn't work.
And I have a .pdbrc file

b 5
commands 1
do_something()
end
c

It doesn't work either.