python中的异常如何处理

1 try:
2     #正常逻辑代码
3     input = raw_input("输入数字:")
4     data = int(input)
5 
6 except Exception,e:
7     #逻辑代码块出现错误,
8     print ‘请输入数字!!!‘

 1 while True:
 2     number1 = raw_input(‘number1:‘)
 3     number2 = raw_input(‘number2:‘)
 4     try:
 5         num1 = int(number1)
 6         num2 = int(number2)
 7         res = number1 + number2
 8         print res
 9     except Exception, e:
10         print ‘出现异常，信息如下：‘
11         print e

ArithmeticError
AssertionError
AttributeError
BaseException
BufferError
BytesWarning
DeprecationWarning
EnvironmentError
EOFError
Exception
FloatingPointError
FutureWarning
GeneratorExit
ImportError
ImportWarning
IndentationError
IndexError
IOError
KeyboardInterrupt
KeyError
LookupError
MemoryError
NameError
NotImplementedError
OSError
OverflowError
PendingDeprecationWarning
ReferenceError
RuntimeError
RuntimeWarning
StandardError
StopIteration
SyntaxError
SyntaxWarning
SystemError
SystemExit
TabError
TypeError
UnboundLocalError
UnicodeDecodeError
UnicodeEncodeError
UnicodeError
UnicodeTranslateError
UnicodeWarning
UserWarning
ValueError
Warning
ZeroDivisionError

str = ‘abc‘
try:
    int(str)
except IndexError,e:
    print ‘出现异常,信息如下:‘
    print e

 1 str = ‘abc‘
 2 try:
 3     int(str)
 4 except IndexError,e:
 5     print ‘出现异常,信息如下:‘
 6     print e
 7 except ValueError,e:
 8     print ‘出现异常,信息如下:‘
 9     print e
10 except KeyError,e:
11     print ‘出现异常,信息如下:‘
12     print e

1 str = ‘abc‘
2 try:
3     int(str)
4 except Exception,e:
5     print e

 1 try:
 2     # 逻辑代码,连接数据库,执行sql语句
 3     pass
 4 except KeyError,e:
 5     # 异常时，执行该块
 6     pass
 7 else:
 8     # 逻辑码块中未出现异常执行这里的代码
 9     pass
10 finally:
11     # 永远执行,主代码块执行完之后执行.断开数据库连接,释放资源
12     pass

 1 class A:
 2     def a1(self):
 3         return False
 4 
 5 try:
 6     a = ‘1‘
 7     #a = int(a)
 8     re = A()
 9     ret = re.a1()
10     if ret:
11         print ‘成功‘
12     else:
13         raise Exception() #执行这一行代码,等于直接倒转到下面的except Exception
14 except Exception,e:
15     print ‘出现错误!!‘
16     print e

 1 class Gavinerror(Exception):
 2 
 3     def __init__(self,date=None):
 4         self.date = date
 5     def __str__(self):
 6         if self.date:
 7             return  self.date
 8         else:
 9             return ‘Gavin error‘
10 try:
11     raise Gavinerror()
12 except Exception,e:
13     print e