code: def subdir_findall(dir, subdir):
      
      strip_n = len(dir.split('/'))
      path = '/'.join((dir, subdir))
      return ['/'.join(s.split('/')[strip_n:]) for s in setuptools.findall(path)]
docs: Find all files in a subdirectory and return paths relative to dir
  
      This is similar to (and uses) setuptools.findall
      However, the paths returned are in the form needed for package_data