option for csv agent to not include df in prompt (#4610)

langchain/agents/agent_toolkits/pandas/base.py

@@ -2,7 +2,11 @@
 from typing import Any, Dict, List, Optional
 
 from langchain.agents.agent import AgentExecutor
-from langchain.agents.agent_toolkits.pandas.prompt import PREFIX, SUFFIX
+from langchain.agents.agent_toolkits.pandas.prompt import (
+    PREFIX,
+    SUFFIX_NO_DF,
+    SUFFIX_WITH_DF,
+)
 from langchain.agents.mrkl.base import ZeroShotAgent
 from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.base import BaseCallbackManager
@@ -15,7 +19,7 @@ def create_pandas_dataframe_agent(
     df: Any,
     callback_manager: Optional[BaseCallbackManager] = None,
     prefix: str = PREFIX,
-    suffix: str = SUFFIX,
+    suffix: Optional[str] = None,
     input_variables: Optional[List[str]] = None,
     verbose: bool = False,
     return_intermediate_steps: bool = False,
@@ -23,6 +27,7 @@ def create_pandas_dataframe_agent(
     max_execution_time: Optional[float] = None,
     early_stopping_method: str = "force",
     agent_executor_kwargs: Optional[Dict[str, Any]] = None,
+    include_df_in_prompt: Optional[bool] = True,
     **kwargs: Dict[str, Any],
 ) -> AgentExecutor:
     """Construct a pandas agent from an LLM and dataframe."""
@@ -35,14 +40,27 @@ def create_pandas_dataframe_agent(
 
     if not isinstance(df, pd.DataFrame):
         raise ValueError(f"Expected pandas object, got {type(df)}")
-
+    if include_df_in_prompt is not None and suffix is not None:
-    if input_variables is None:
+        raise ValueError("If suffix is specified, include_df_in_prompt should not be.")
-        input_variables = ["df", "input", "agent_scratchpad"]
+    if suffix is not None:
+        suffix_to_use = suffix
+        if input_variables is None:
+            input_variables = ["df", "input", "agent_scratchpad"]
+    else:
+        if include_df_in_prompt:
+            suffix_to_use = SUFFIX_WITH_DF
+            input_variables = ["df", "input", "agent_scratchpad"]
+        else:
+            suffix_to_use = SUFFIX_NO_DF
+            input_variables = ["input", "agent_scratchpad"]
     tools = [PythonAstREPLTool(locals={"df": df})]
     prompt = ZeroShotAgent.create_prompt(
-        tools, prefix=prefix, suffix=suffix, input_variables=input_variables
+        tools, prefix=prefix, suffix=suffix_to_use, input_variables=input_variables
     )
-    partial_prompt = prompt.partial(df=str(df.head().to_markdown()))
+    if "df" in input_variables:
+        partial_prompt = prompt.partial(df=str(df.head().to_markdown()))
+    else:
+        partial_prompt = prompt
     llm_chain = LLMChain(
         llm=llm,
         prompt=partial_prompt,

langchain/agents/agent_toolkits/pandas/prompt.py

@@ -4,7 +4,12 @@ PREFIX = """
 You are working with a pandas dataframe in Python. The name of the dataframe is `df`.
 You should use the tools below to answer the question posed of you:"""
 
-SUFFIX = """
+SUFFIX_NO_DF = """
+Begin!
+Question: {input}
+{agent_scratchpad}"""
+
+SUFFIX_WITH_DF = """
 This is the result of `print(df.head())`:
 {df}
 

langchain/tools/python/tool.py

@@ -102,7 +102,7 @@ class PythonAstREPLTool(BaseTool):
                     output = mystdout.getvalue()
                 except Exception as e:
                     sys.stdout = old_stdout
-                    output = str(e)
+                    output = repr(e)
                 return output
         except Exception as e:
             return "{}: {}".format(type(e).__name__, str(e))

langchain/utilities/python.py

@@ -21,5 +21,6 @@ class PythonREPL(BaseModel):
             output = mystdout.getvalue()
         except Exception as e:
             sys.stdout = old_stdout
-            output = str(e)
+            output = repr(e)
+        print(output)
         return output

tests/unit_tests/test_python.py

@@ -54,7 +54,7 @@ def test_python_repl_no_previous_variables() -> None:
     foo = 3  # noqa: F841
     repl = PythonREPL()
     output = repl.run("print(foo)")
-    assert output == "name 'foo' is not defined"
+    assert output == """NameError("name 'foo' is not defined")"""
 
 
 def test_python_repl_pass_in_locals() -> None: