This is the fourth in a series of summarizations of what’s in each release of Python. The first three were:

• What’s in which Python 2.x?
• What’s in which Python 3.0–3.3?
• What’s in which Python 3.4–3.6?

Update: I’ve now collected all the “What’s in which Python”s onto a single page: What’s in which Python.

3.7: June 27, 2018

• postponed evaluation of type annotations (PEP 563)
• async and await are keywords
• dataclasses
• dict order is guaranteed

Full list of 3.7 changes.

3.8: October 14, 2019

• assignment expressions (walrus operator := )
• f-string “=” specifier
• positional-only parameters

Full list of 3.8 changes.

3.9: October 5, 2020

• dict union operators
• type hinting generics in standard collections
• relaxed decorator syntax
• str.removeprefix and str.removesuffix

Full list of 3.9 changes.