fix: remove URLs in pydantic error messages

Fixes jxnl#509

Pydantic includes error URLs in ValidationErrors which means extra
tokens used in LLM calls.

Pydantic relies on an environment variable to control this setting and
is on by default. https://github.com/pydantic/pydantic-core/blob/e1fc99dd3207157aad77defc20ab6873fd268b5b/python/pydantic_core/_pydantic_core.pyi#L818

This change sets the environment variable dynamically when the package
is invoked.

instructor/__init__.py

@@ -1,6 +1,7 @@
 import importlib.util
 
 from .mode import Mode
+from .utils import set_env_variable
 from .process_response import handle_response_model
 from .distil import FinetuneFormat, Instructions
 from .dsl import (
@@ -22,6 +23,7 @@
     Provider,
 )
 
+set_env_variable()
 
 __all__ = [
     "Instructor",

instructor/utils.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import inspect
+import os
 import json
 import logging
 from collections.abc import AsyncGenerator, Generator, Iterable
@@ -209,3 +210,7 @@ def __init__(self, method: Callable[[Any], R_co]) -> None:
 
     def __get__(self, instance: object, cls: type[Any]) -> R_co:
         return self.cproperty(cls)
+
+
+def set_env_variable():
+    os.environ["PYDANTIC_ERRORS_INCLUDE_URL"] = "0"

tests/test_function_calls.py

@@ -1,4 +1,4 @@
-from typing import TypeVar
+from typing import TypeVar, List
 
 import pytest
 from anthropic.types import Message, Usage
@@ -186,3 +186,16 @@ def test_control_characters_allowed_in_anthropic_json_non_strict_mode(
         mock_anthropic_message, mode=instructor.Mode.ANTHROPIC_JSON, strict=False
     )
     assert test_model_instance.data == "Claude likes\ncontrol\ncharacters"
+
+
+def test_pylance_url_config() -> None:
+    class Model(BaseModel):
+        list_of_ints: List[int] = None
+        a_float: float = None
+
+    data = dict(list_of_ints=["1", 2, "bad"], a_float="Not a float")
+
+    try:
+        Model(**data)
+    except ValidationError as e:
+        assert "https://errors.pydantic.dev" not in str(e)