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MW001: incompatible-import

docs/guides/lint_rules/rules/incompatible_import.md

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MW001: incompatible-import

šŸŒ WASM āŒ Not Fixable

MW001: Importing modules unavailable in WASM/Pyodide.

What it does

Checks each cell's imports against a blocklist of stdlib modules that either don't exist in Pyodide or are stubs that fail at runtime.

Why is this bad?

WASM notebooks run in the browser via Pyodide, which cannot support modules that depend on OS-level process control, terminal I/O, or native GUI toolkits. Importing these modules will raise ImportError or produce broken stubs.

Examples

Problematic:

python
import subprocess

result = subprocess.run(["ls"])

Problematic:

python
from multiprocessing import Pool

Solution: Remove or replace the import with a WASM-compatible alternative.

References