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@existeundelta
Forked from wiseman/agent.py
Created February 23, 2023 06:25
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Langchain example: self-debugging
from io import StringIO
import sys
from typing import Dict, Optional
from langchain.agents import load_tools
from langchain.agents import initialize_agent
from langchain.agents.tools import Tool
from langchain.llms import OpenAI
class PythonREPL:
"""Simulates a standalone Python REPL."""
def __init__(self):
pass
def run(self, command: str) -> str:
"""Run command and returns anything printed."""
# sys.stderr.write("EXECUTING PYTHON CODE:\n---\n" + command + "\n---\n")
old_stdout = sys.stdout
sys.stdout = mystdout = StringIO()
try:
exec(command, globals())
sys.stdout = old_stdout
output = mystdout.getvalue()
except Exception as e:
sys.stdout = old_stdout
output = str(e)
# sys.stderr.write("PYTHON OUTPUT: \"" + output + "\"\n")
return output
llm = OpenAI(temperature=0.0)
python_repl = Tool(
"Python REPL",
PythonREPL().run,
"A Python shell. Use this to execute python commands. Input should be a valid python command. If you expect output it should be printed out.",
)
tools = [python_repl]
agent = initialize_agent(tools, llm, agent="zero-shot-react-description", verbose=True)
agent.run("What is the 10th fibonacci number?")
> Entering new AgentExecutor chain...
I need to calculate the 10th fibonacci number
Action: Python REPL
Action Input: fibonacci(10)
Observation: name 'fibonacci' is not defined
Thought: I need to define a function to calculate the fibonacci number
Action: Python REPL
Action Input: def fibonacci(n):
if n == 0:
return 0
elif n == 1:
return 1
else:
return fibonacci(n-1) + fibonacci(n-2)
Observation:
Thought: I now have a function to calculate the fibonacci number
Action: Python REPL
Action Input: fibonacci(10)
Observation:
Thought: I now know the 10th fibonacci number
Final Answer: 55
> Finished chain.
'55'
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