> ## Documentation Index
> Fetch the complete documentation index at: https://docs.mellea.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# mellea.stdlib.requirements.python_reqs

> Requirements for Python code generation validation.

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Requirements for Python code generation validation.

## Classes

<div className="w-full h-px bg-gray-200 dark:bg-gray-700 my-4" />

### <span className="ml-2 inline-flex items-center rounded-full px-2 py-1 text-[0.7rem] font-bold tracking-wide bg-[#4ADE8033]/20 text-[#15803D]">CLASS</span> `PythonExecutionReq` <sup><a href="https://github.com/generative-computing/mellea/blob/v0.6.0/mellea/stdlib/requirements/python_reqs.py#L142" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

Verifies that Python code runs without raising exceptions.

Extracts the highest-scoring Python code block from the model's last output
and validates or executes it according to the configured execution mode.

**Args:**

* `timeout`: Maximum seconds to allow code to run. Defaults to `5`.
* `allow_unsafe_execution`: If `True`, execute code directly with
  subprocess. Use only with trusted sources.
* `allowed_imports`: Allowlist of importable top-level
  modules. `None` allows any import.
* `use_sandbox`: If `True`, use `llm-sandbox` for Docker-based
  isolated execution.

**Attributes:**

* `validation_fn`: The validation
  function attached to this requirement; always non-`None`.

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