Passing in keyword arguments leads to a TypeError

[ysabri]

This if statement chain fails when keyword arguments are used for the region and service.

Code looks like this:

AWS4Auth(credentials.access_key, 
                   credentials.secret_key, 
                   region='us-east-1', 
                   service='aoss', 
                   session_token=credentials.token)

[mrapacz]

Just stumbled upon this. I'd expect one of these scenarios to happen:

1. Minimal effort - I'd expect this TypeError to have a message mentioning that using keyword arguments may cause this package to fail.
2. Just a little bit more effort - I'd expect the code to handle keyword arguments and compute the l variable based on both args and kwargs.