undefined-local-with-import-star (F403)

Derived from the Pyflakes linter.

What it does

Checks for the use of wildcard imports.

Why is this bad?

Wildcard imports (e.g., from module import *) make it hard to determine which symbols are available in the current namespace, and from which module they were imported. They're also discouraged by PEP 8.

Example

from math import *


def area(radius):
    return pi * radius**2

Use instead:

from math import pi


def area(radius):
    return pi * radius**2