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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _fix_path():
 """Finds the google_appengine directory and fixes Python imports to use it."""

  import os
  import sys
  all_paths = os.environ.get('PYTHONPATH').split(os.pathsep)
  for path_dir in all_paths:
    dev_appserver_path = os.path.join(path_dir, 'dev_appserver.py')
    if os.path.exists(dev_appserver_path):
      logging.debug('Found appengine SDK on path!')
      google_appengine = os.path.dirname(os.path.realpath(dev_appserver_path))
      sys.path.append(google_appengine)
      # Use the next import will fix up sys.path even further to bring in
      # any dependent lib directories that the SDK needs.
      dev_appserver = __import__('dev_appserver')
      sys.path.extend(dev_appserver.EXTRA_PATHS)
      return