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DOCS: Fix Sample Code for Compatibility with Pydantic 2.0 (#13890)
- **Description:** I encountered an issue while running the existing sample code on the page https://python.langchain.com/docs/modules/agents/how_to/agent_iter in an environment with Pydantic 2.0 installed. The following error was triggered: ```python ValidationError Traceback (most recent call last) <ipython-input-12-2ffff2c87e76> in <cell line: 43>() 41 42 tools = [ ---> 43 Tool( 44 name="GetPrime", 45 func=get_prime, 2 frames /usr/local/lib/python3.10/dist-packages/pydantic/v1/main.py in __init__(__pydantic_self__, **data) 339 values, fields_set, validation_error = validate_model(__pydantic_self__.__class__, data) 340 if validation_error: --> 341 raise validation_error 342 try: 343 object_setattr(__pydantic_self__, '__dict__', values) ValidationError: 1 validation error for Tool args_schema subclass of BaseModel expected (type=type_error.subclass; expected_class=BaseModel) ``` I have made modifications to the example code to ensure it functions correctly in environments with Pydantic 2.0.
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@ -22,7 +22,7 @@
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"metadata": {},
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"outputs": [],
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"source": [
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"import pydantic\n",
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"from pydantic.v1 import BaseModel, Field\n",
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"from langchain.agents import AgentType, initialize_agent\n",
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"from langchain.agents.tools import Tool\n",
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"from langchain.chains import LLMMathChain\n",
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@ -65,12 +65,12 @@
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"primes = {998: 7901, 999: 7907, 1000: 7919}\n",
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"\n",
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"\n",
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"class CalculatorInput(pydantic.BaseModel):\n",
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" question: str = pydantic.Field()\n",
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"class CalculatorInput(BaseModel):\n",
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" question: str = Field()\n",
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"\n",
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"\n",
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"class PrimeInput(pydantic.BaseModel):\n",
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" n: int = pydantic.Field()\n",
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"class PrimeInput(BaseModel):\n",
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" n: int = Field()\n",
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"\n",
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"\n",
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"def is_prime(n: int) -> bool:\n",
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