Have you installed the corresponding python 3 lib for postgres?
*pip3* install --no-binary :all: --upgrade psycopg2

What's your os? I'm using Linux and I switched to python 3, also using 
postgres and I have no problems with psycopg2.

Best regards
Clemens


On Wednesday, February 5, 2020 at 3:44:44 PM UTC+1, Maurice Waka wrote:
>
> I recently installed python 3.6.9 and reinstalled web2py. Previously 
> everything was working well. Now I have this error when trying to log in:
>
> 1.
> 2.
> 3.
> 4.
> 5.
> 6.
> 7.
> 8.
> 9.
> 10.
> 11.
> 12.
> 13.
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> 15.
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> 17.
> 18.
> 19.
> 20.
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> 25.
> 26.
> 27.
> 28.
>
> Traceback (most recent call last):
>   File "/home/maurice/web2py/gluon/restricted.py", line 219, in restricted
>     exec(ccode, environment)
>   File "/home/maurice/web2py/applications/rivelar/models/db2.py" 
> <http://127.0.0.1:8000/admin/default/edit/rivelar/models/db2.py>, line 12, in 
> <module>
>     db = DAL( 
> "postgres://mauricewaka:b3th32dau2a##@localhost:5432/riveldb")#, 
> migrate=False)
>   File "/home/maurice/web2py/gluon/packages/dal/pydal/base.py", line 171, in 
> __call__
>     obj = super(MetaDAL, cls).__call__(*args, **kwargs)
>   File "/home/maurice/web2py/gluon/packages/dal/pydal/base.py", line 477, in 
> __init__
>     "Failure to connect, tried %d times:\n%s" % (attempts, tb)
> RuntimeError: Failure to connect, tried 5 times:
> Traceback (most recent call last):
>   File "/home/maurice/web2py/gluon/packages/dal/pydal/base.py", line 457, in 
> __init__
>     self._adapter = adapter(**kwargs)
>   File "/home/maurice/web2py/gluon/packages/dal/pydal/adapters/postgres.py", 
> line 27, in __call__
>     return AdapterMeta.__call__(cls, *args, **kwargs)
>   File "/home/maurice/web2py/gluon/packages/dal/pydal/adapters/__init__.py", 
> line 39, in __call__
>     obj = super(AdapterMeta, cls).__call__(*args, **kwargs)
>   File "/home/maurice/web2py/gluon/packages/dal/pydal/adapters/postgres.py", 
> line 54, in __init__
>     driver_args, adapter_args, do_connect, after_connection)
>   File "/home/maurice/web2py/gluon/packages/dal/pydal/adapters/base.py", line 
> 369, in __init__
>     super(SQLAdapter, self).__init__(*args, **kwargs)
>   File "/home/maurice/web2py/gluon/packages/dal/pydal/adapters/base.py", line 
> 51, in __init__
>     self._initialize_(do_connect)
>   File "/home/maurice/web2py/gluon/packages/dal/pydal/adapters/postgres.py", 
> line 95, in _initialize_
>     self.driver.__version__)
> AttributeError: module 'gluon.contrib.psycopg2' has no attribute '__version__'
>
>

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