old_contents: """Helper functions to search files."""
  
  from __future__ import division, print_function, unicode_literals
  
  import os
  import re
  
  
  def find_all(path, filename_regex):
      """Find all files in ``path`` that match ``filename_regex`` regex."""
      path = os.path.abspath(path)
      for root, dirs, files in os.walk(path, topdown=True):
          dirs.sort()
          for filename in files:
              if re.match(filename_regex, filename):
                  yield os.path.abspath(os.path.join(root, filename))
  
  
  def find_one(path, filename_regex):
      """Find the first file in ``path`` that match ``filename_regex`` regex."""
      for _path in find_all(path, filename_regex):
          return _path
      return ''
  
new_contents: """Helper functions to search files."""
  
  from __future__ import division, print_function, unicode_literals
  
  import os
  import re
  
  
  def find_one(path, filename_regex):
      """Find the first file in ``path`` that match ``filename_regex`` regex."""
      _path = os.path.abspath(path)
      for filename in os.listdir(_path):
          if re.match(filename_regex, filename):
              return os.path.join(_path, filename)
  
      return ''
  
subject: Remove logic for iterating directories to search for config file