Following PEP 8 styling guideline.
Get the most of `int`s
There is more to copying
Prioritize your `queue` 
`weakref` proxies
dad603230fff032f1a5816ff0cf33b1ffd160071
Following PEP 8 styling guideline.
Get the most of `int`s
There is more to copying
Prioritize your `queue` 
`weakref` proxies