Fixed Ast Python Repl for Chatgpt multiline commands (#2406)

Resolves issue https://github.com/hwchase17/langchain/issues/2252

---------

Co-authored-by: Abhik Singla <abhiksingla@microsoft.com>

langchain/tools/python/tool.py

@@ -50,6 +50,7 @@ class PythonAstREPLTool(BaseTool):
     )
     globals: Optional[Dict] = Field(default_factory=dict)
     locals: Optional[Dict] = Field(default_factory=dict)
+    sanitize_input: bool = True
 
     @root_validator(pre=True)
     def validate_python_version(cls, values: Dict) -> Dict:
@@ -65,6 +66,9 @@ class PythonAstREPLTool(BaseTool):
     def _run(self, query: str) -> str:
         """Use the tool."""
         try:
+            if self.sanitize_input:
+                # Remove the triple backticks from the query.
+                query = query.strip().strip("```")
             tree = ast.parse(query)
             module = ast.Module(tree.body[:-1], type_ignores=[])
             exec(ast.unparse(module), self.globals, self.locals)  # type: ignore

tests/unit_tests/test_python.py

@@ -1,7 +1,10 @@
 """Test functionality of Python REPL."""
+import sys
+
+import pytest
 
 from langchain.python import PythonREPL
-from langchain.tools.python.tool import PythonREPLTool
+from langchain.tools.python.tool import PythonAstREPLTool, PythonREPLTool
 
 _SAMPLE_CODE = """
 ```
@@ -11,6 +14,14 @@ multiply()
 ```
 """
 
+_AST_SAMPLE_CODE = """
+```
+def multiply():
+    return(5*6)
+multiply()
+```
+"""
+
 
 def test_python_repl() -> None:
     """Test functionality when globals/locals are not provided."""
@@ -60,6 +71,15 @@ def test_functionality_multiline() -> None:
     assert output == "30\n"
 
 
+def test_python_ast_repl_multiline() -> None:
+    """Test correct functionality for ChatGPT multiline commands."""
+    if sys.version_info < (3, 9):
+        pytest.skip("Python 3.9+ is required for this test")
+    tool = PythonAstREPLTool()
+    output = tool.run(_AST_SAMPLE_CODE)
+    assert output == 30
+
+
 def test_function() -> None:
     """Test correct functionality."""
     chain = PythonREPL()