How can I create this type hint.

[deanhystad]

I am trying to create a type string using type hint information I get using inspect.signature(). I have this working for most types:

Output:
Type Type String ---- ----------- int "I" float "F" str "S" list[int] ">II" list[float] ">IF"

My problem is that I actually have two list types that differ by "direction": TO and FROM. A TO list is used to pass values from a sender to a receiver. A FROM list is used to return values from the receiver back to the sender. TO and FROM lists are part of a messaging protocol that was originally used to communicate between C programs.

example receiver: function(to_size, to_values, from_size, from_values) { for(int i = 0; i < MIN(to_size, from_size); i++) from_values[i] = to_values[i]; } example sender: int *to_values = {1, 2, 3, 4}; int *from_values[4]; typestr = remote.typestring("function") // returns ">II<II" remote.call("function", typestr, 4, to_values, 4, from_values)

I still need to communicate to and between C programs, plus there is much legacy code that uses this protocol. Changes to the protocol is off the table unless they are backward compatible. I need help making a type hint that will let me write something like this in Python

# example receiver function(to_values: list[int], from_values: return_list[int]): for i in range(min(len(to_values), len(from_values))): from_values[i] = to_values[i] # example sender to_values = [1, 2, 3, 4] from_values = numpy.zeros(4, int32) typestr = remote.typestring("function") remote.call("function", typestr, to_values, 4, from_values) # and the calling mechanism will expand to remote.call("function", typestr, len(to_values), to_values, len(from_values), from_values)