old_contents: from subprocess import Popen, PIPE
  from plyer.facades import UniqueID
  from plyer.utils import whereis_exe
  
  
  class LinuxUniqueID(UniqueID):
      def _get_uid(self):
          lshw_process = Popen(["lshw", "-quiet"], stdout=PIPE, stderr=PIPE)
          grep_process = Popen(["grep", "-m1", "serial:"],
              stdin=lshw_process.stdout, stdout=PIPE)
          lshw_process.stdout.close()
          output = grep_process.communicate()[0]
  
          if output:
              return output.split()[1]
          else:
              return None
  
  
  def instance():
      import sys
      if whereis_exe('lshw'):
          return LinuxUniqueID()
      sys.stderr.write("lshw not found.")
      return UniqueID()
  
new_contents: from subprocess import Popen, PIPE
  from plyer.facades import UniqueID
  from plyer.utils import whereis_exe
  
  from os import environ
  
  
  class LinuxUniqueID(UniqueID):
      def _get_uid(self):
          old_lang = environ.get('LANG')
          environ['LANG'] = 'C'
          lshw_process = Popen(["lshw", "-quiet"], stdout=PIPE, stderr=PIPE)
          grep_process = Popen(["grep", "-m1", "serial:"],
                               stdin=lshw_process.stdout, stdout=PIPE)
          lshw_process.stdout.close()
          output = grep_process.communicate()[0]
          environ['LANG'] = old_lang
  
          if output:
              return output.split()[1]
          else:
              return None
  
  
  def instance():
      import sys
      if whereis_exe('lshw'):
          return LinuxUniqueID()
      sys.stderr.write("lshw not found.")
      return UniqueID()
  
subject: use environ to change LANG to 'C' while calling lshw