Resolve Codacy errors

[holtgrewe]

After some configuration, the Codacy issues appear to be at least somewhat useable. However, there are 2k+ such issues and adressing them will be a major effort. We should distribute files/paths by person and go through them one-by-one. Certain classes can be adressed automatically, certain classes have to be adressed in a proper way and certain classes should be ignored (one-by-one or the whole pattern).

auto cleanup

• trailing whitespace

manual no-brainer cleanup

• unused import
• line too long, split strings
  • in python using the "parantheses trick" (line wrapping is ignored in parentheses to wrap strings into parentheses to make string concatenation explicit ("X" "Y") - of course only if wrapping over lines, NB the indent)
  • in bash use line wrapping with backspaces
• import beyond current package, replace by snappy_wrappers... etc. full import

one-by-one treatment

• unused variable
  • exceptions may be ignored
  • parameters may get a underscore prefix, or _ = x assignment to unused
• string statement has no effect
• redefined built-in X
  • rename to X_ or give it another name

[holtgrewe]

Trailing whitespace can be removed with Perl, unused import with autoflakes. See #7.