validator_raw.py

from cerberus import Validator

body = {"data": {"elemento1": "123.98", "elemento": "olaMundo"}}

body_validator = Validator(
    {
        "data": {
            "type": "dict",
            "schema": {
                "elemento1": {"type": "float", "required": True, "empty": False},
                "elemento2": {"type": "string", "required": True, "empty": True},
                "elemento3": {"type": "string", "required": False, "empty": False},
            },
        },
    }
)

response = body_validator.validate(body)

if response is False:
    print(body_validator.errors)
else:
    print("Body OK")