How to connect to mongoDB: I'm getting errors when connecting

[Maurice Waka]

I was trying out this example, not sure whether its outdated, 

but got this errors:

le "/usr/local/lib/python3.6/dist-packages/pymongo/helpers.py", line 155, in _check_command_response
 raise OperationFailure(msg % errmsg, code, response)
pymongo.errors.OperationFailure: Authentication failed.

this was my db line:

db = DAL("mongodb://mwakewaka: blahblaha123**@ds123456.mlab.com:1257467/testriver", check_reserved=["mongodb_nonreserved",],  adapter_args={"safe":False})

However I not that this connection with localhost is ok.

db = DAL('mongodb://localhost/queellness')

[Massimo Di Pierro]

You have a space in the uri string. could that be a problem?