docs: def readline(self):
          """
          Read and analyse the next line of the SExtractor catalog
          and return a dictionary {'param1': value, 'param2': value, ...}.
          """
          if not(self._firstline):
              self._line = self._file.readline()
  
          self._firstline = False
  
          if not(self._line):
              return None
          __ll = (self._line).replace('\n', '')
          __values = __ll.split()
          self._outdict.update(dict(zip(self._keys, __values)))
          for i in self._keys:
              self._outdict[i] = (
                  SExtractorfile._SE_keys[i]["infunc"](self._outdict[i]))
  
          return self._outdict.copy()