python-装饰器封装try-exception

本文更新地址:http://blog.csdn.net/tanzuozhev

采用try-exception是python捕获异常的常用方式，但在代码频繁的使用着实麻烦，所以采用装饰器对try-catch进行了封装。

def get_decorator(errors=(Exception, ), default_value=''):

    def decorator(func):

        def new_func(*args, **kwargs):
            try:
                return func(*args, **kwargs)
            except errors, e:
                print "Got error! ", repr(e)
                return default_value

        return new_func

    return decorator

try_except = get_decorator(default_value='default')
a = {}

@try_except
def example1(a):
    return a['b']

@try_except
def example2(a):
    return doesnt_exist()

print example1(a)
print example2(a)
#Got error!  KeyError('b',)
#default
#Got error!  NameError("global name 'doesnt_exist' is not #defined",)
#default

import sys,traceback
def try_except(f):
    def handle_problems(*args, **kwargs):
        try:
            return f(*args, **kwargs)
        except Exception:
            exc_type, exc_instance, exc_traceback = sys.exc_info()
            formatted_traceback = ''.join(traceback.format_tb(exc_traceback))
            message = '\n{0}\n{1}:\n{2}'.format(
                formatted_traceback,
                exc_type.__name__,
                exc_instance
            )
#             raise exc_type(message)
            print(exc_type(message))
            # 其他你喜欢的操作
        finally:
            pass
    return handle_problems

举例

@try_except
def  chu(x, y):
    return(x/y)

chu(1,0)
#   File "", line 5, in handle_problems
#     return f(*args, **kwargs)
#   File "", line 22, in chu
#     return(x/y)

# ZeroDivisionError:
# division by zero

参考：http://stackoverflow.com/questions/9386592/repetitive-try-and-except-clauses

http://stackoverflow.com/questions/9005941/python-exception-decorator-how-to-preserve-stacktrace

http://stackoverflow.com/questions/23218974/wrapping-class-method-in-try-except-using-decorator