message: bin: Somewhat improve linting.
diff: #!/usr/bin/env python3
  +'''Main driver for drake.'''
  +
  import os
  import sys
  -prefix = os.path.realpath(os.path.dirname(os.path.dirname(__file__)))
  -search = [
  +PREFIX = os.path.realpath(os.path.dirname(os.path.dirname(__file__)))
  +SEARCH = [
  os.path.join('lib', 'python{}.{}'.format(*sys.version_info), 'site-packages'),
  'lib',
  '.',
  ]
  -lib = None
  -for p in (os.path.join(prefix, s) for s in search):
  +LIB = None
  +for p in (os.path.join(PREFIX, s) for s in SEARCH):
  if os.path.exists(os.path.join(p, 'drake')):
  - lib = p
  + LIB = p
  break
  -if lib is None:
  +if LIB is None:
  print('{}: unable to find drake libraries'.format(sys.argv[0]), file=sys.stderr)
  exit(1)
  -sys.path.insert(0, lib)
  +sys.path.insert(0, LIB)
  import drake
  -path = '.'
  +PATH = '.'
  if len(sys.argv) > 1 and not sys.argv[1].startswith('-'):
  - path = sys.argv[1]
  + PATH = sys.argv[1]
  del sys.argv[1]
  -drake.run(path)
  +drake.run(PATH)
  