Part of #9744
Removes all redundant `# -*- coding: utf-8 -*-` lines from files, as python 3 automatically reads source code as utf-8 now.
`Signed-off-by: Jonathan de Jong <jonathan@automatia.nl>`
This is a mixed commit that fixes various small issues
* print parentheses
* 01 is invalid syntax (it was octal in py2)
* [x for i in 1, 2] is invalid syntax
* six moves
Signed-off-by: Adrian Tschira <nota@notafile.com>
Twisted core doesn't have a general purpose one, so we need to write one
ourselves.
Features:
- All writing happens in background thread
- Supports both push and pull producers
- Push producers get paused if the consumer falls behind
