Daniel Arbuckle's Mastering Python

Other changes in Python packages

Some low-level improvements have been made in Python since version 3.5, such as faster reading of filesystem directories, automatic retrying of interrupted operating system calls, and a math.isclose function for checking whether two numbers are approximately equal.

There are also a bunch of more minor additions that improve things throughout the standard library, all backwards compatible with earlier Python 3 versions.

In the rare cases where something is added that breaks backwards compatibility, it's not enabled by default. For such a change, if we want to use it, we'd have to specifically mark our code as supporting the change. Those changes will not become standard until two versions later, so a breaking ...