import traceback
try:
except Exception, e:
    print sys._getframe().f_lineno, 'str(e):\t\t', str(e)
    print sys._getframe().f_lineno, 'repr(e):\t', repr(e)
    print sys._getframe().f_lineno, 'e.message:\t', e.message
    print sys._getframe().f_lineno, 'traceback.print_exc():'; traceback.print_exc()
    print sys._getframe().f_lineno, 'traceback.format_exc():\n%s' % traceback.format_exc()
# 關(guān)鍵是這一句
traceback.print_exc()

 try:
     self.cursor.execute(select_plan_info_sql, params)
     for x in self.cursor.fetchall():
         plan.append({     
         })
 except DatabaseError as ex:
     app_log.error("database error: %s, sql: %s, traceback: %s",
                   ex, self.cursor.statement, traceback.format_exc())

try:
    f1 = open("test.txt","rU")
    for i in f1:
        i=i.strip()
        print(i)
except Exception as E_results:
    print("捕捉有異常：",E_results)
finally: #finally的代碼是肯定執(zhí)行的，不管是否有異常,但是finally語塊是可選的。
    f1.close
    print("我不管，我肯定要執(zhí)行。")

# 實例1
def fn(s):
    n = s
    if n == 0:
        raise MyError('invalid value: %s' % s)
    return 9 / n
fn(0)
# 實例2
try:
     self.cursor.execute(select_plan_info_sql, params)
     for x in self.cursor.fetchall():
         plan.append({     
         })
 except DatabaseError as ex:
     app_log.error("database error: %s, sql: %s, traceback: %s",
                   ex, self.cursor.statement, traceback.format_exc())
     raise HTTPError(500)

try:
    10 / 0
except ZeroDivisionError:
    raise ValueError('input error!')

def put(self):
    app_id = self.get_argument("app_id").strip()
    if not app_id:
        self.fail(message="Invalid app_id")
    self.cache.sadd(settings.ALLOWED_APPS_KEY, app_id)
    self.success()

def int_cond_judge(temp_para, para, list_num):
     if list_num is None:
         list_num = []
     if not temp_para:
         return None, "{} is empty".format(para)
     if isinstance(temp_para, (unicode, str)) and not temp_para.isdigit():
         return None, "{} format is wrong".format(para)
     temp_para = int(temp_para)
     if list_num and temp_para not in list_num:
         return None, "{} is out of range".format(para)
     return temp_para, None
#	上一步中各個情況的return返回值為tuple
def return_value(self, temp_para, para, list_num=None):
     value, msg = int_cond_judge(temp_para, para, list_num)
     if msg:
         self.fail(message=msg)
     return value

#   list
json_list = requests.get(self.url_list, self.params).json()
self.assertEqual(json_list['status'], 0)