Python 3.7, 3.8, 3.9, or 3.10 as minimal version #1220

Hi,
This is continued discussion of Python3 at the end of #528 which is about Python2.
I summary pros and cons dicussed in #528 and important features in official What's new in Python 3.X

Python 3.10

Pros:

• Structural Pattern Matching
• Allow writing union types as X | Y
• Parenthesized context managers

Cons:

• Latest Python version, most Linux distros now support now
• No PyPy3.10 release info available

Python 3.9

Pros:

• built-in CAN_RAW_JOIN_FILTERS support
• built-in CAN_J1939 support
• Dictionary Merge & Update Operators
• Supported or built-in in recent released Linux distros
• PEP 585, type hinting generics in standard collections (update)

Cons:

• PyPy3.9 not released, but should be soon, according it's release history.

Python 3.8

Pros:

• Assignment expressions
• f-strings support = for self-documenting expressions and debugging
• Positional-only parameters
• Supported or built-in in most Linux distros
• PyPy3.8 released

Cons:

• Not supported or or built-in in old Linux distros

Python 3.7

Pros:

• built-in CAN_ISOTP support
• The new breakpoint() function.
• Forced UTF-8 Runtime Mode
• Python data model improvements
• New Time Functions With Nanosecond Resolution
• Best compatibility compared with 3.8~3.10

Cons:

• Some popular packages have dropped support 3.7, such as NumPy, IPython. more packages should also drop 3.7 support in furture.
• No CAN_RAW_JOIN_FILTERS & CAN_J1939 intruduced in 3.9 (best features in CAN bus in personally)
• No assignment & f-string self-documenting expressions intruduced in 3.8 (best features in language in personally)
• All new features in 3.7 are included in 3.8~3.10.

Also, asyncio module is almost improved in each main version of Python.

So, in personlly, I prefer Python 3.9 or 3.8 as minimal supported version.