Create list of available modules.

    Arguments
    ---------
    pkg : module
        module to inspect

    Returns
    ---------
    method : list
        A list of available submodules

def avail_approaches(pkg):
    '''Create list of available modules.

    Arguments
    ---------
    pkg : module
        module to inspect

    Returns
    ---------
    method : list
        A list of available submodules
    '''
    methods = [modname for importer, modname, ispkg in
               pkgutil.walk_packages(path=pkg.__path__)
               if modname not in
               ['common_args', 'directions', 'sobol_sequence']]
    return methods