code: def get_sep(self, key='param', target='in'):
          
          target = 'out' if target == 'out' else 'in'
          if self.style[target] in ['numpydoc', 'google']:
              return ''
          return self.opt[key][self.style[target]]['sep']
docs: Get the separator of current style.
          e.g.: in reST and javadoc style, it is ":"
  
          :param key: the key which separator is wanted (param, type, return, rtype,..) (Default value = 'param')
          :param target: the target docstring is 'in' for the input or
            'out' for the output to generate. (Default value = 'in')