> ## 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-PYCALL-0001: A Python declaration or call shape is unsupported or incompatible.

> A Python declaration or call shape is unsupported or incompatible.

`SIFR-PYCALL-0001` belongs to the **Embedded Python calls** diagnostic family. It means: a Python declaration or call shape is unsupported or incompatible.

## Why It Happens

A Python callable, attribute, item, or coroutine operation failed the Sifr bridge contract. Align call shape, await usage, and attribute/item access with the declared Python surface.

<Info>
  Use `sifr --explain SIFR-PYCALL-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-PYCALL-0001`                                                                                             |
| Family                 | `PYCALL`                                                                                                       |
| Severity               | Error                                                                                                          |
| Stability              | stable                                                                                                         |
| Owner                  | `sifr_lowering`                                                                                                |
| Representative fixture | `crates/sifr_lowering/src/lower/python_interop_tests.rs::invalid_python_declaration_shape_reports_pycall_0001` |

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