Barebones loader for sudoku checker and solver

barebones_loader.py

import sys, os, imp
filepath = os.path.abspath(sys.argv[1])
mod_name = os.path.splitext(filepath)[0]
user_mod = imp.load_source(mod_name, filepath)
check_sudoku = user_mod.check_sudoku
solve_sudoku = user_mod.solve_sudoku
# Then just run it, e.g. with do_test(check_sudoku, solve_sudoku)

sudoku_loader.py

def main():
    import sys, os, imp
    raise_errors = False
    checker_name = len(sys.argv) > 2 and sys.argv[2] or "check_sudoku"
    solver_name = len(sys.argv) > 3 and sys.argv[3] or "solve_sudoku"
    check_sudoku, solve_sudoku = None, None
    if len(sys.argv) < 2: 
        sys.exit("You need to pass the file name for check_sudoku")
    else:
        filepath = os.path.abspath(sys.argv[1])
        mod_name = os.path.splitext(filepath)[0]
        user_mod = imp.load_source(mod_name, filepath)
    try:
        check_sudoku = getattr(user_mod, checker_name)
    except AttributeError:
        msg = "Module has no function '%s'" % checker_name
        if raise_errors:
            raise AttributeError(msg)
        print msg
    try:
        solve_sudoku = getattr(user_mod, solver_name)
    except AttributeError:
        msg = "Module has no function '%s'" % solver_name
        if raise_errors:
            raise AttributeError(msg)
        print msg
    # Then just run it, e.g. with do_test(check_sudoku, solve_sudoku)

if __name__ == '__main__':
    # this makes it only parse args when run as main file
    main()