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

# SIFR-PYCONV-0001: A Sifr type has no active declaration-first Python conversion.

> A Sifr type has no active declaration-first Python conversion.

`SIFR-PYCONV-0001` belongs to the **Sifr/Python conversions** diagnostic family. It means: a Sifr type has no active declaration-first Python conversion.

## Why It Happens

A value could not be converted across the Sifr/Python boundary. Use a supported conversion path for the primitive or structured type involved.

<Info>
  Use `sifr --explain SIFR-PYCONV-0001` locally to see the renderer's exact message template and any machine-applicable suggestions for the compiler version you are running.
</Info>

## Details

| Field                  | Value                                                                                                                  |
| ---------------------- | ---------------------------------------------------------------------------------------------------------------------- |
| Code                   | `SIFR-PYCONV-0001`                                                                                                     |
| Family                 | `PYCONV`                                                                                                               |
| Severity               | Error                                                                                                                  |
| Stability              | stable                                                                                                                 |
| Owner                  | `sifr_lowering`                                                                                                        |
| Representative fixture | `crates/sifr_lowering/src/lower/python_interop_validation_tests.rs::unsupported_python_conversion_reports_pyconv_0001` |

See the [Error Codes index](/diagnostics/error-codes) for the complete catalog.