Test script that shows default empty list of Pydantic does a deep copy

testPydanticList.py

from dataclasses import field
from typing import List
from pydantic import BaseModel, Field

class ClassWithList(BaseModel):
    list: List = Field([], description="A list field")


a = ClassWithList()
b = ClassWithList()

b.list = ["a", "b"]

print(f"List {a=}")
print(f"List {b=}")

# Prints:
# List a=ClassWithList(list=[])
# List b=ClassWithList(list=['a', 'b'])