The functionality comes from the prior string.format method, which has been around since Python 2.6 (first released in 2008).
https://docs.python.org/2.6/library/string.html#formatspec
> It's faster to do it yourself ad-hoc.
I have found the syntax to be quite mentally "sticky".
> the implementation is right there (and easy to customize!) not buried in the docs and immutable.
There are hooks to customize it.
The functionality comes from the prior string.format method, which has been around since Python 2.6 (first released in 2008).
https://docs.python.org/2.6/library/string.html#formatspec
> It's faster to do it yourself ad-hoc.
I have found the syntax to be quite mentally "sticky".
> the implementation is right there (and easy to customize!) not buried in the docs and immutable.
There are hooks to customize it.