[python-types] _exchanges.py: signature_type: Optional[Any] in Polymarket.__init__

[realfishsam]

File

sdks/python/pmxt/_exchanges.py

Note: Issue #227 covers the same problem in Exchange.__init__ in client.py (line 267). This issue covers the identical problem in the auto-generated _exchanges.py, which the generator must also be fixed to address.

Excessive Any Usage (CRITICAL — public constructor)

Line 20 — Polymarket.__init__

signature_type: Optional[Any] = "gnosis-safe",

signature_type controls how Polymarket signs orders. Its valid values are a small, well-known set of strings ("EOA", "GNOSIS_SAFE", "gnosis-safe", etc.), but the annotation Optional[Any] tells the type checker nothing. Users receive no IDE hint about what values are legal.

Impact

• CRITICAL: Polymarket is the most widely used exchange class in the SDK. Every user who tries to set signature_type= receives no IDE autocompletion and no static validation.
• mypy and pyright silently accept any value (e.g., Polymarket(signature_type=42)) with no warning.

Generator Note

This file is auto-generated by core/scripts/generate-python-exchanges.js. The fix must be applied in the generator template, not the generated file, otherwise it will be overwritten on the next npm run generate:sdk:all.

Suggested Fix

In the generator template, replace Optional[Any] with a concrete type for signature_type:

from typing import Literal, Optional

SignatureType = Literal["EOA", "GNOSIS_SAFE", "gnosis-safe"]

class Polymarket(Exchange):
    def __init__(
        self,
        ...,
        signature_type: Optional[SignatureType] = "gnosis-safe",
        ...
    ): ...

If the full set of valid values is not stable enough to Literal-ize, Optional[str] is still a strict improvement over Optional[Any].

---

Found by automated Python type hints audit