code: def addFilter(self, field, value):
          
          if "<" not in value or ">" not in value or ".." not in value:
              value = ":" + value
  
          if self.__urlFilters:
              self.__urlFilters += "+" + field + str(quote(value))
          else:
              self.__urlFilters += field + str(quote(value))
docs: Add a filter to the seach.
  
          :param field: what field filter (see GitHub search).
          :type field: str.
          :param value: value of the filter (see GitHub search).
          :type value: str.