Python3.9 compatibility error
Description
When connecting to a server fails, Python 3.8 shows this error:
`cassandra.cluster.NoHostAvailable: ("Unable to connect to any servers using keyspace 'test'", ['127.0.0.1'])`
With concise stack trace:
```
File "cassandra/cluster.py", line 1712, in cassandra.cluster.Cluster.connect
File "cassandra/cluster.py", line 1769, in cassandra.cluster.Cluster._new_session
File "cassandra/cluster.py", line 2550, in cassandra.cluster.Session._init_
```
Python 3.9, on the other hand shows this error:
`cassandra.cluster.NoHostAvailable: ('Unable to connect to any servers', {'127.0.0.1:9042': TypeError('type() takes 1 or 3 arguments')})`
with longer stack trace:
```
File "cassandra/cluster.py", line 1664, in cassandra.cluster.Cluster.connect
File "cassandra/cluster.py", line 1700, in cassandra.cluster.Cluster.connect
File "cassandra/cluster.py", line 1687, in cassandra.cluster.Cluster.connect
File "cassandra/cluster.py", line 3485, in cassandra.cluster.ControlConnection.connect
File "cassandra/cluster.py", line 3530, in cassandra.cluster.ControlConnection._reconnect_internal
```
This suggests to me that there's a bug in error handling or raising an exception.
Environment
macOS, Python 3.9.0b1 vs. Python 3.8.3, using AsyncioConnection
Pull Requests
Activity
Thanks for the report Dima. We'll fix this when adding the Python 3.9 support.
