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88 lines
3.0 KiB
Python
88 lines
3.0 KiB
Python
"""A tool for running python code in a REPL."""
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import ast
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import sys
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from typing import Dict, Optional
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from pydantic import Field, root_validator
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from langchain.python import PythonREPL
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from langchain.tools.base import BaseTool
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def _get_default_python_repl() -> PythonREPL:
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return PythonREPL(_globals=globals(), _locals=None)
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class PythonREPLTool(BaseTool):
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"""A tool for running python code in a REPL."""
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name = "Python REPL"
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description = (
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"A Python shell. Use this to execute python commands. "
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"Input should be a valid python command. "
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"If you want to see the output of a value, you should print it out "
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"with `print(...)`."
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)
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python_repl: PythonREPL = Field(default_factory=_get_default_python_repl)
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sanitize_input: bool = True
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def _run(self, query: str) -> str:
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"""Use the tool."""
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if self.sanitize_input:
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query = query.strip().strip("```")
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return self.python_repl.run(query)
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async def _arun(self, query: str) -> str:
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"""Use the tool asynchronously."""
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raise NotImplementedError("PythonReplTool does not support async")
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class PythonAstREPLTool(BaseTool):
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"""A tool for running python code in a REPL."""
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name = "python_repl_ast"
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description = (
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"A Python shell. Use this to execute python commands. "
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"Input should be a valid python command. "
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"When using this tool, sometimes output is abbreviated - "
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"make sure it does not look abbreviated before using it in your answer."
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)
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globals: Optional[Dict] = Field(default_factory=dict)
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locals: Optional[Dict] = Field(default_factory=dict)
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sanitize_input: bool = True
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@root_validator(pre=True)
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def validate_python_version(cls, values: Dict) -> Dict:
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"""Validate valid python version."""
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if sys.version_info < (3, 9):
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raise ValueError(
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"This tool relies on Python 3.9 or higher "
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"(as it uses new functionality in the `ast` module, "
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f"you have Python version: {sys.version}"
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)
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return values
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def _run(self, query: str) -> str:
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"""Use the tool."""
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try:
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if self.sanitize_input:
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# Remove the triple backticks from the query.
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query = query.strip().strip("```")
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tree = ast.parse(query)
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module = ast.Module(tree.body[:-1], type_ignores=[])
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exec(ast.unparse(module), self.globals, self.locals) # type: ignore
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module_end = ast.Module(tree.body[-1:], type_ignores=[])
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module_end_str = ast.unparse(module_end) # type: ignore
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try:
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return eval(module_end_str, self.globals, self.locals)
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except Exception:
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exec(module_end_str, self.globals, self.locals)
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return ""
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except Exception as e:
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return str(e)
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async def _arun(self, query: str) -> str:
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"""Use the tool asynchronously."""
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raise NotImplementedError("PythonReplTool does not support async")
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