ruff-rules-for-pyupgrade

[cclauss]

% ruff check --target-version=py38 --select=UP --statistics

120	UP009	[*] utf8-encoding-declaration
 15	UP007	[*] non-pep604-annotation-union
 15	UP034	[*] extraneous-parentheses
  6	UP004	[*] useless-object-inheritance
  6	UP006	[*] non-pep585-annotation
  4	UP018	[*] native-literals
  2	UP012	[*] unnecessary-encode-utf8
  2	UP022	[*] replace-stdout-stderr
  1	UP015	[*] redundant-open-modes
  1	UP039	[*] unnecessary-class-parentheses

% ruff rule UP009

utf8-encoding-declaration (UP009)

Derived from the pyupgrade linter.

Fix is always available.

What it does

Checks for unnecessary UTF-8 encoding declarations.

Why is this bad?

PEP 3120 makes UTF-8 the default encoding, so a UTF-8 encoding
declaration is unnecessary.

Example

# -*- coding: utf-8 -*-
print("Hello, world!")

Use instead:

print("Hello, world!")

[boomanaiden154]

Seems reasonable enough to me.

I can try and fix the license checking script for UP009.

[cclauss]

I will do UP009 in a separate pull request because it touches so many files.

• Remove deprecated Python utf8 encoding declaration #441