mirror of
https://github.com/hwchase17/langchain
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2f2b77602e
Several `core` modules do not have descriptions, like the [agent](https://api.python.langchain.com/en/latest/core_api_reference.html#module-langchain_core.agents) module. - Added missed module descriptions. The descriptions are mostly copied from the `langchain` or `community` package modules.
50 lines
1.9 KiB
Python
50 lines
1.9 KiB
Python
"""Custom **exceptions** for LangChain. """
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from typing import Any, Optional
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class LangChainException(Exception):
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"""General LangChain exception."""
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class TracerException(LangChainException):
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"""Base class for exceptions in tracers module."""
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class OutputParserException(ValueError, LangChainException):
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"""Exception that output parsers should raise to signify a parsing error.
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This exists to differentiate parsing errors from other code or execution errors
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that also may arise inside the output parser. OutputParserExceptions will be
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available to catch and handle in ways to fix the parsing error, while other
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errors will be raised.
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Args:
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error: The error that's being re-raised or an error message.
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observation: String explanation of error which can be passed to a
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model to try and remediate the issue.
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llm_output: String model output which is error-ing.
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send_to_llm: Whether to send the observation and llm_output back to an Agent
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after an OutputParserException has been raised. This gives the underlying
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model driving the agent the context that the previous output was improperly
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structured, in the hopes that it will update the output to the correct
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format.
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"""
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def __init__(
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self,
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error: Any,
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observation: Optional[str] = None,
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llm_output: Optional[str] = None,
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send_to_llm: bool = False,
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):
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super(OutputParserException, self).__init__(error)
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if send_to_llm:
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if observation is None or llm_output is None:
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raise ValueError(
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"Arguments 'observation' & 'llm_output'"
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" are required if 'send_to_llm' is True"
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)
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self.observation = observation
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self.llm_output = llm_output
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self.send_to_llm = send_to_llm
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