Get local setting for the keys.
    :param module_and_var_name: for example: admin_account.admin_user, then you need to put admin_account.py in
        local/local_keys/ and add variable admin_user="real admin username", module_name_and_var_name should not
        contain "-" because
    :param default_module: If the template can not be directly imported, use this to specify the parent module.
    :return: value for the key

def get_local_key(module_and_var_name, default_module=None):
    """
    Get local setting for the keys.
    :param module_and_var_name: for example: admin_account.admin_user, then you need to put admin_account.py in
        local/local_keys/ and add variable admin_user="real admin username", module_name_and_var_name should not
        contain "-" because
    :param default_module: If the template can not be directly imported, use this to specify the parent module.
    :return: value for the key
    """
    if "-" in module_and_var_name:
        raise ModuleAndVarNameShouldNotHaveDashCharacter
    key_name_module_path = module_and_var_name.split(".")
    module_name = ".".join(key_name_module_path[0:-1])
    attr_name = key_name_module_path[-1]
    c = ConfigurableAttributeGetter(module_name, default_module)
    return c.get_attr(attr_name)