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69 lines
1.6 KiB
Python
69 lines
1.6 KiB
Python
"""Chain that runs python code.
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Heavily borrowed from https://replit.com/@amasad/gptpy?v=1#main.py
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"""
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import sys
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from io import StringIO
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from typing import Dict, List
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from pydantic import BaseModel
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from langchain.chains.base import Chain
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from langchain.python import PythonREPL
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class PythonChain(Chain, BaseModel):
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"""Chain to run python code.
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Example:
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.. code-block:: python
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from langchain import PythonChain
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python_chain = PythonChain()
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"""
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input_key: str = "code" #: :meta private:
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output_key: str = "output" #: :meta private:
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@property
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def input_keys(self) -> List[str]:
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"""Expect input key.
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:meta private:
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"""
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return [self.input_key]
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@property
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def output_keys(self) -> List[str]:
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"""Return output key.
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:meta private:
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"""
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return [self.output_key]
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def _run(self, inputs: Dict[str, str]) -> Dict[str, str]:
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python_repl = PythonREPL()
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old_stdout = sys.stdout
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sys.stdout = mystdout = StringIO()
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python_repl.run(inputs[self.input_key])
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sys.stdout = old_stdout
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output = mystdout.getvalue()
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return {self.output_key: output}
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def run(self, code: str) -> str:
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"""Run code in python interpreter.
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Args:
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code: Code snippet to execute, should print out the answer.
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Returns:
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Answer from running the code and printing out the answer.
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Example:
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.. code-block:: python
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answer = python_chain.run("print(1+1)")
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"""
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return self({self.input_key: code})[self.output_key]
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