从追溯获取最后一个函数的调用参数? [英] Get last function's call arguments from traceback?
问题描述
我可以获取在追溯中调用的最后一个函数的参数吗?如何?
我想制作标准错误的捕手来制作可读的代码,但可以向用户提供详细的信息。
在下面的例子中,我想要GET_PARAMS给我一个提供给os.chown的参数元组。检查Alex Martelli建议的检查
模块,我找不到。
def catch_errors(fn):
pre>
def decorator(* args,** kwargs):
try:
return fn(* args,** kwargs)
except( IOError,OSError):
msg = sys.exc_info()[2] .tb_frame.f_locals ['error_message']
quit(msg.format(SEQUENCE_OF_PARAMETERS_OF_THE_LAST_FUNCTION_CALLED)\
+'\ nError#{0 [0]}:{0 [1]}'。format(sys.exc_info()[1] .args),1)
return decorator
@catch_errors
def do_your_job():
error_message ='不能更改文件夹所有权\'{0} \'(uid:{1},gid:{2})'
os.chown('/ root',1000,1000)#注意,参数不是命名的vars。
如果__name =='__main__'和os.getenv('USERNAME')!='root':
do_your_job()
(感谢 Jim Robert 的装饰师)
解决方案使用装饰器为您尝试实现的问题是异常处理程序获取的框架是
do_your_job()
s,而不是os.listdir()
s,os.makedirs() / code> s或
os.chown()
s。因此,您要打印的信息是do_your_job()
的参数。为了获得我认为你打算的行为,你必须装饰你正在调用的所有库函数。Can I get the parameters of the last function called in traceback? How?
I want to make a catcher for standard errors to make readable code, yet provide detailed information to user.
In the following example I want GET_PARAMS to return me a tuple of parameters supplied to os.chown. Examining the
inspect
module advised by Alex Martelli, I couldn't find that.def catch_errors(fn): def decorator(*args, **kwargs): try: return fn(*args, **kwargs) except (IOError, OSError): msg = sys.exc_info()[2].tb_frame.f_locals['error_message'] quit(msg.format(SEQUENCE_OF_PARAMETERS_OF_THE_LAST_FUNCTION_CALLED)\ + '\nError #{0[0]}: {0[1]}'.format(sys.exc_info()[1].args), 1) return decorator @catch_errors def do_your_job(): error_message = 'Can\'t change folder ownership \'{0}\' (uid:{1}, gid:{2})' os.chown('/root', 1000, 1000) # note that params aren't named vars. if __name == '__main__' and os.getenv('USERNAME') != 'root': do_your_job()
(Thanks to Jim Robert for the decorator)
解决方案The problem with using a decorator for what you're trying to achieve is that the frame the exception handler gets is
do_your_job()
s, notos.listdir()
s,os.makedirs()
s oros.chown()
s. So the information you'll be printing out is the arguments todo_your_job()
. In order to get the behavior I think you intend, you would have to decorate all the library functions you're calling.这篇关于从追溯获取最后一个函数的调用参数?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!