code: def login_defs():
      
      uid_min = None
      uid_max = None
      login_defs_path = '/etc/login.defs'
      if os.path.exists(login_defs_path):
          with io.open(text_type(login_defs_path), encoding=text_type('utf-8')) as log_defs_file:
              login_data = log_defs_file.readlines()
          for line in login_data:
              if PY3:  # pragma: no cover
                  line = str(line)
              if PY2:  # pragma: no cover
                  line = line.encode(text_type('utf8'))
              if line[:7] == text_type('UID_MIN'):
                  uid_min = int(line.split()[1].strip())
              if line[:7] == text_type('UID_MAX'):
                  uid_max = int(line.split()[1].strip())
      if not uid_min:  # pragma: no cover
          uid_min = DEFAULT_UID_MIN
      if not uid_max:  # pragma: no cover
          uid_max = DEFAULT_UID_MAX
      return uid_min, uid_max
docs: Discover the minimum and maximum UID number.