from dataclasses import dataclass, field
import pickle
from typing import List

@dataclass
class Transaction:
    person: str
    value: int
    description: str


@dataclass
class Project:
    acronym: str
    title: str
    description: str
    amount: int

    history: List[Transaction] = field(default_factory=list)

if __name__ == "__main__":
    history = [Transaction(f"person {i}", i, f"description {i}") for i in range(10)]
    project1 = Project("acronym", "title", "description", 500, history)
    with open("file", "wb+") as file1:
        pickle.dump(project1, file1)
    with open("file", "rb") as file2:
        project2  = pickle.load(file2)
    print(project2)