python——异常(1),捕获特定异常

"""
1.捕获指定异常，异常类型有多种
2.若尝试执行的代码异常类型与捕获的异常类型不同则报错
3.try下方一般只放一行代码，若有多行可能异常代码，
则捕获一个异常类型后函数返回，及只能捕获一个异常类型。
4.捕获多个指定异常
5.捕获所有异常，Exception 是所有程序异常类的父类
"""


# 异常类型：NameError
# print(n)

# 异常类型：ZeroDivisionError
# print(1/0)


def t1():
 try:
 print(num)
 except NameError:
 print('有错误')


def t2():
 try:
 print('you')
 print(num)
 print(1/0)
 except ZeroDivisionError:
 print('有错误')


def t3():
 """
 捕获多个指定异常
 捕获异常描述信息
 """
 try:
 print(num)
 except (NameError, ZeroDivisionError) as result:
 print(result)
 # name 'num' is not defined


def t4():
 try:
 print(num)
 except Exception as result:
 print(result)


if __name__ == '__main__':
 # t1()
 # t2()
 # t3()
 t4()