Fix complicated string formatting.
Fix complicated string formatting.

PEP8 be damned!  https://www.python.org/dev/peps/pep-0008/#a-foolish-consistency-is-the-hobgoblin-of-little-minds

Addresses https://github.com/jensengroup/propka-3.1/pull/40#discussion_r432302025

jensengroup/propka,jensengroup/propka-3.1