move csv agent to langchain experimental (#12113)

libs/experimental/langchain_experimental/agents/agent_toolkits/csv/__init__.py

@@ -0,0 +1 @@
+"""CSV toolkit."""

libs/experimental/langchain_experimental/agents/agent_toolkits/csv/base.py

@@ -0,0 +1,37 @@
+from io import IOBase
+from typing import Any, List, Optional, Union
+
+from langchain.agents.agent import AgentExecutor
+from langchain.schema.language_model import BaseLanguageModel
+
+from langchain_experimental.agents.agent_toolkits.pandas.base import (
+    create_pandas_dataframe_agent,
+)
+
+
+def create_csv_agent(
+    llm: BaseLanguageModel,
+    path: Union[str, IOBase, List[Union[str, IOBase]]],
+    pandas_kwargs: Optional[dict] = None,
+    **kwargs: Any,
+) -> AgentExecutor:
+    """Create csv agent by loading to a dataframe and using pandas agent."""
+    try:
+        import pandas as pd
+    except ImportError:
+        raise ImportError(
+            "pandas package not found, please install with `pip install pandas`"
+        )
+
+    _kwargs = pandas_kwargs or {}
+    if isinstance(path, (str, IOBase)):
+        df = pd.read_csv(path, **_kwargs)
+    elif isinstance(path, list):
+        df = []
+        for item in path:
+            if not isinstance(item, (str, IOBase)):
+                raise ValueError(f"Expected str or file-like object, got {type(path)}")
+            df.append(pd.read_csv(item, **_kwargs))
+    else:
+        raise ValueError(f"Expected str, list, or file-like object, got {type(path)}")
+    return create_pandas_dataframe_agent(llm, df, **kwargs)