llms_fake.py

from langchain.llms.fake import FakeListLLM
from langchain.agents import load_tools
from langchain.agents import initialize_agent
from langchain.agents import AgentType

tools = load_tools(tool_names=["python_repl"])
responses = [
    "Action: Python REPL\nAction Input: print(2 + 2)",
    "Final Answer: 4"
]
llm = FakeListLLM(responses=responses)
agent = initialize_agent(tools, llm, agent=AgentType.ZERO_SHOT_REACT_DESCRIPTION, verbose=True)

result = agent.run("55+66")
print("result:",result)