Fix lint errors attempt langchain-ai#2

Author: svdeepak99

tests/unit_tests/agents/test_mrkl.py

@@ -2,14 +2,12 @@
 
 from typing import Tuple
 
-import pytest
-
 from langchain.agents.mrkl.base import ZeroShotAgent
 from langchain.agents.mrkl.output_parser import MRKLOutputParser
 from langchain.agents.mrkl.prompt import FORMAT_INSTRUCTIONS, PREFIX, SUFFIX
 from langchain.agents.tools import Tool
 from langchain.prompts import PromptTemplate
-from langchain.schema import AgentAction, OutputParserException
+from langchain.schema import AgentAction
 from tests.unit_tests.llms.fake_llm import FakeLLM