Psycopg2: Connect() with environment and no parameters

[camillehuot]

Hi

According to the documentation and tests, connect() needs a DSN string or arguments to specify connection information.
But the documentation also says that we can use environment variables to specify such information.
That's what I want to do, but I'm forced to give at least one parameter to connect() or it will fail with:

// everything is set in the environment (PG* variables)
con = psycopg2.connect()
File "/usr/lib/python3.6/site-packages/psycopg2/__init__.py", line 127, in connect
raise TypeError('missing dsn and no parameters')
TypeError: missing dsn and no parameters

// this works
con = psycopg2.connect('dbname={}'.format(os.getenv('PGDATABASE')))

Is there a cleaner solution than reading one of the variable to feed connect()?
Why "no parameters" raise an error?

Thanks

[dvarrazzo]

Use psycopg2.connect('') with an empty string.

[camillehuot]

Make sense, thanks

[j0nimost]

Use psycopg2.connect('') with an empty string.

Does this mean it automatically picks the fields from the env?

[camillehuot]

Yes it does