Some minor tweaks

[ch3pjw]

Just trying out this package and reading through the source code. I made a couple of minor tweaks for your consideration:

• The main one, functionally, is not to have a bare except, but specify Exception so that we don't run the risk of hanging forever by catching KeyboardInterrupt erroneously.
• I updated some type annotations that were causing some noise in my editor, which lead to a minor update for how password is passed to pymysql.connect.
• I changed some whitespace that was likewise causing some noise.