# import traceback # def calc(a,b): #     res = a/b #     return res # # # def main(): #     money=input('输入多少钱：') #     months=input('还几个月：') #     try: #         res = calc(int(money),int(months)) #     except ZeroDivisionError as e:#try里面的代码出错 走except #         traceback.print_exc() #         print("还款的月数不能为0",e) #     except ValueError as e: #         print("输入必须是整数，%s"%e) #     except Exception as e: #         print('未知错误！') # #     else:#没有出错走else #         print('每个月还%s'%res) #     print('hihihi') # # import pymysql # def main2(): #     try: #         conn = pymysql.connect() #     except Exception as e: #         print('数据库连接不了，%s'%e) #     else: #         cur=conn.cursor() #         try: #             cur.execute(sql) #         except Exception as e: #             print('sql语句有错误！%s。sql是"%s"%(e,sql)') #         else: #             res = cur.fetchall() #             return res #         finally: #             cur.close() #             conn.close() import requests def req():     r = requests.get('http://118.24.3.40/api/user/all_stu',headers={'Refere':'http://118.24.3.40/'})     if len(r.json()['stu_info'])<0:         pass     else:         raise Exception('接口无数据')#主动剖出异常 req()