Data classes with replace

dataclasses.py

from dataclasses import dataclass, replace
from typing import List, Optional

@dataclass(frozen=True)
class State:
    val1: float
    val2: float
      
@dataclass
class Controller:
    outer1: float
    outer2: str
    state: Optional[State] = None
      
controllers: List[Controller] = [
    Controller(1, 'H000'),
    Controller(2, 'H001'),
    Controller(3, 'H002'),
    Controller(4, 'H003')
]
  
states: List[State] = [
    State(1, 3),
    State(2, 5),
    State(3, 7),
    State(4, 7)
]
  
for c in controllers:
    for s in states:
        c = replace(c, state=s)
        print(c)