Macro define_parameters 

macro_rules! define_parameters {
    (
		$vis:vis $name:ident = {
			$(
				$key_name:ident $( ($key_para: ty) )? : $value_type:ty = $index:expr
			),+ $(,)?
		}
	) => { ... };
}

Define parameters key value types. Example:

define_parameters! {
    pub Pallet = {
        Key1: u64 = 0,
        Key2(u32): u32 = 1,
        Key3((u8, u8)): u128 = 2,
    }
}