old_contents: from subprocess import Popen, PIPE
  from plyer.facades import UniqueID
  
  class OSXUniqueID(UniqueID):
     	def _get_uid(self):
  		ioreg_process = Popen(["ioreg", "-l"], stdout=PIPE)
  		grep_process = Popen(["grep", "IOPlatformSerialNumber"], 
  			stdin=ioreg_process.stdout, stdout=PIPE)
  		ioreg_process.stdout.close()
  		output = grep_process.communicate()[0]
  
  		if output:
  			return output.split()[3][1:-1]
  		else:
  			return None
  
  def instance():
  	return OSXUniqueID()
new_contents: from subprocess import Popen, PIPE
  from plyer.facades import UniqueID
  
  class OSXUniqueID(UniqueID):
      def _get_uid(self):
          ioreg_process = Popen(["ioreg", "-l"], stdout=PIPE)
          grep_process = Popen(["grep", "IOPlatformSerialNumber"], 
              stdin=ioreg_process.stdout, stdout=PIPE)
          ioreg_process.stdout.close()
          output = grep_process.communicate()[0]
  
          if output:
              return output.split()[3][1:-1]
          else:
              return None
  
  def instance():
      return OSXUniqueID()
  
subject: Fix tabbing