Python自定义异常及抛出异常

"""
    自定义异常
"""
class MyException(Exception): # 继承异常类
    def __init__(self, name, reason):
        self.name = name
        self.reason = reason
    
from datetime import datetime
try:
    if str(datetime.now()) > "2018":
        raise MyException("TimeoutException", "time is overtime...")
except MyException as e:
    print(e.name +":"+e.reason)
    
"""
    抛出异常
"""        
try:
    6/0
    raise
except Exception as e:
    print(e)

 8 try:
 9     print("--------------") 10 except NameError as e: # 捕获NameError类型异常 11 print(e) 12 except Exception as e: # 捕获其它异常 13 print(e) 14 else: 15 print("没有异常会接着往下执行。。。") 16 finally: 17 print("最后一定执行。。。") 18 19 # 测试捕获某种或某些种except 20 try: 21 print(aaa) 22 print("--------------") # 出现异常后不会执行下面的程序 23 except NameError as e: # 捕获NameError类型异常 24 print(e) 25 except Exception as e: # 捕获其它异常 26 print(e) 27 else: 28 print("没有异常会接着往下执行。。。") 29 finally: 30 print("最后一定执行。。。") 31 32 # 测试捕获其它异常 33 try: 34 open("a.txt") 35 print("--------------") 36 except NameError as e: # 捕获NameError类型异常 37 print(e) 38 except Exception as e: # 捕获其它异常 39 print(e) 40 else: 41 print("没有异常会接着往下执行。。。") 42 finally: 43 print("最后一定执行。。。") 44 45 # 测试异常传递 46 def err(): 47 print(aaa) 48 49 try: 50 print("===============") 51  err() 52 except NameError as e: # 捕获NameError类型异常 53 print(e) 54 55 print("use try will make your code beauty")

结果：