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#

# Source code for langchain.utilities.python

    import sys
    from io import StringIO
    from typing import Dict, Optional

    from pydantic import BaseModel, Field

    class PythonREPL(BaseModel):
        """Simulates a standalone Python REPL."""

        globals: Optional[Dict] = Field(default_factory=dict, alias="_globals")
        locals: Optional[Dict] = Field(default_factory=dict, alias="_locals")

        def run(self, command: str) -> str:
            """Run command with own globals/locals and returns anything printed."""
            old_stdout = sys.stdout
            sys.stdout = mystdout = StringIO()
            try:
                exec(command, self.globals, self.locals)
                sys.stdout = old_stdout
                output = mystdout.getvalue()
            except Exception as e:
                sys.stdout = old_stdout
                output = str(e)
            return output