Question

Please complete:

• OS: Ubuntu 18.04
• Python version import sys; print(sys.version): 3.6.8 [GCC 7.4.0]
• Pydantic version import pydantic; print(pydantic.VERSION): 1.2a1

Hello, I'm trying to create an instance of class Bar.

import pydantic
from typing import List


class Foo(pydantic.BaseModel):
    foo: List[List[int]]

    @pydantic.validator('foo')
    def check_something(cls, value):
        return value


class Bar(Foo):
    pass


foo_ = [[0, 1]]
Foo(foo=foo_)
Bar(foo=foo_)

Output:

pydantic.error_wrappers.ValidationError: 1 validation error for Bar
foo -> 0
  value is not a valid integer (type=type_error.integer)

There will be no error, If you remove validator.