[Python-ideas] Add a mechanism so that multiple exceptions can be caught using `except E1, E2, E3:`

[Thomas Grainger]

now that python2.7 is EOL, it might be worth resurrecting this syntax as 
discussed in https://www.python.org/dev/peps/pep-3100/#id13

eg, python 3.11 could support
```
try:
    ...
except (E1, E2, E3) as e:
    ...
```

as equivalent to 

```
try:
    ...
except E1, E2, E3 as e:
    ...
```

see also 
https://mail.python.org/archives/list/python-...@python.org/thread/HSN6ESRB4BD6IUIPKLMNP4TPBQPWHBFK/
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