flake8-deprecated

2.3.0 verified Mon Apr 27 auth: no python

A flake8 plugin that warns about deprecated method calls in Python code. Current version: 2.3.0, compatible with Python >=3.10. Maintained but low release cadence.

pip install flake8-deprecated

Common errors

error No module named 'flake8_deprecated' ↓

cause Attempting to import flake8_deprecated directly in Python code.

fix

Do not import the plugin manually. It is automatically registered when you run flake8.

error flake8 reports DA1 ... (unexpected warning) ↓

cause The plugin flags deprecated calls that may still be present in your codebase.

fix

Read the warning message; it includes the specific deprecated function. Replace with the suggested alternative.

Warnings

gotcha Only Python >=3.10 is supported as of version 2.3.0. Older Python versions will fail installation. ↓

fix Upgrade Python to 3.10+ or pin to an older version (e.g., flake8-deprecated==1.4) if needed.

gotcha The plugin only reports deprecated calls that are explicitly listed; it does not detect all forms of deprecation (e.g., missing deprecation warnings in third-party libs). ↓

fix Supplement with other tools like pylint or bandit for broader deprecated API detection.

Imports

flake8_deprecated
```
flake8 registers plugins automatically; no manual import is needed.
```
The plugin is discovered by flake8 when installed. Incorrect to import directly.

Quickstart

After installing, run flake8 on your code. The plugin adds checks prefixed with 'DA' (Deprecated API).

# Sample code with deprecated calls
import os
os.getcwd()  # Example
# Run: flake8 --select=DA mycode.py