Python 列表去重组合：将 ['pid', '', ''], ['', 'se_area', ''], ['', '', '1'] 等元组合并成 '1,se_area,pid'

a = [('pid', '', ''), ('pid', '', ''), ('', 'se_area', ''), ('', 'se_area', ''), ('', 'se_area', ''), ('', 'se_area', ''), ('', 'se_area', ''), ('pid', '', ''), ('pid', '', ''), ('', 'se_area', ''), ('', 'se_area', ''), ('', 'se_area', ''), ('', '', '1'), ('', '', '1')]

result = set() for item in a: if item[0] != '': result.add(item[0]) if item[1] != '': result.add(item[1]) if item[2] != '': result.add(item[2])

result_list = list(result) result_list.sort()

print(','.join(result_list)) # 输出为1,pid,se_area