code: def get_cpuinfo_field(self, field):
          
          # Match a line like 'Hardware   : BCM2709':
          pattern = r'^' + field + r'\s+:\s+(.*)$'
  
          with open('/proc/cpuinfo', 'r') as infile:
              cpuinfo = infile.read().split('\n')
              for line in cpuinfo:
                  match = re.search(pattern, line, flags=re.IGNORECASE)
                  if match:
                      return match.group(1)
  
          return None
docs: Search /proc/cpuinfo for a field and return its value, if found,
          otherwise None.