{"record":{"id":"59e35bdf58b65118","repo":"nodejs/node","slug":"this-feature-is-not-available-for-this-version-of","errorCode":null,"errorMessage":"This feature is not available for this version of Python","messagePattern":"This feature is not available for this version of Python","errorType":"exception","errorClass":"NotImplementedError","httpStatus":null,"severity":"error","filePath":"tools/inspector_protocol/jinja2/environment.py","lineNumber":1020,"sourceCode":"        \"\"\"\n        vars = dict(*args, **kwargs)\n        try:\n            return concat(self.root_render_func(self.new_context(vars)))\n        except Exception:\n            exc_info = sys.exc_info()\n        return self.environment.handle_exception(exc_info, True)\n\n    def render_async(self, *args, **kwargs):\n        \"\"\"This works similar to :meth:`render` but returns a coroutine\n        that when awaited returns the entire rendered template string.  This\n        requires the async feature to be enabled.\n\n        Example usage::\n\n            await template.render_async(knights='that say nih; asynchronously')\n        \"\"\"\n        # see asyncsupport for the actual implementation\n        raise NotImplementedError('This feature is not available for this '\n                                  'version of Python')\n\n    def stream(self, *args, **kwargs):\n        \"\"\"Works exactly like :meth:`generate` but returns a\n        :class:`TemplateStream`.\n        \"\"\"\n        return TemplateStream(self.generate(*args, **kwargs))\n\n    def generate(self, *args, **kwargs):\n        \"\"\"For very large templates it can be useful to not render the whole\n        template at once but evaluate each statement after another and yield\n        piece for piece.  This method basically does exactly that and returns\n        a generator that yields one item after another as unicode strings.\n\n        It accepts the same arguments as :meth:`render`.\n        \"\"\"\n        vars = dict(*args, **kwargs)\n        try:","sourceCodeStart":1002,"sourceCodeEnd":1038,"githubUrl":"https://github.com/nodejs/node/blob/1b2de5e052fc0fb95fd7fb6846dcec4ade598e9e/tools/inspector_protocol/jinja2/environment.py#L1002-L1038","documentation":"Raised by Template.render_async's stub in environment.py. The base Template class ships stubs for the async methods that raise NotImplementedError; the real coroutine implementations are patched in from jinja2.asyncsupport, which is only imported on Python interpreters with async support. If the patch never landed (older/unsupported interpreter, or asyncsupport failed to import), calling render_async hits the stub.","triggerScenarios":"Calling await template.render_async() on a Python build where jinja2.asyncsupport was not imported (so the stub was not monkeypatched); running on an interpreter/Python version Jinja2 regards as lacking async support; an import error in asyncsupport that was silently swallowed leaving the stubs in place.","commonSituations":"Deploying to a minimal/embedded Python that excludes the async support module; pinning an old Jinja2 on a Python version predating async; an environment where asyncsupport.py is missing from the vendored tree.","solutions":["Ensure jinja2.asyncsupport imports cleanly (test `import jinja2.asyncsupport`) on the target interpreter.","Run on a supported Python 3 interpreter and a Jinja2 version that ships asyncsupport.","If async is genuinely unavailable, use the sync render() instead of render_async()."],"exampleFix":"# before\nawait template.render_async()   # NotImplementedError on unsupported interpreter\n# after\nresult = template.render()      # sync path always available","handlingStrategy":"validation","validationCode":"def async_render_available():\n    try:\n        import jinja2.asyncsupport  # noqa\n        return True\n    except ImportError:\n        return False","typeGuard":null,"tryCatchPattern":"try:\n    result = await template.render_async()\nexcept NotImplementedError:\n    result = template.render()   # graceful sync fallback","preventionTips":["Verify `import jinja2.asyncsupport` works on the target interpreter.","Use a supported Python 3 with a complete Jinja2 install.","Keep a sync render() fallback when async support is uncertain."],"tags":["async","jinja2","compatibility","rendering"],"backgroundTag":null,"analyzedSha":"1b2de5e052fc0fb95fd7fb6846dcec4ade598e9e","analyzedAt":"2026-08-13T00:53:24.642Z","schemaVersion":2},"datasetVersion":"2026-08-13T04:17:16.726Z"}