python【try-exception】【装饰器】

1. 带参数装饰器

def get_decorator(errors=(Exception, ), default_value=''):
    def decorator(func):
        def new_func(*args, **kwargs):
            try:
                return func(*args, **kwargs)
            except errors as e:
                print (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))