当肯定存在调用堆栈时，为什么traceback.extract_stack()会返回[]？

发布于 2024-07-30 03:20:17 字数 509 浏览 4 评论 0原文

我有一个调用其 __init__() 的类

traceback.extract_stack()

，但每当我这样做时，traceback.extract_stack() 的值都是 [] 。

造成这种情况的原因有哪些？是否有另一种方法来获得更可靠的回溯？

我认为问题在于代码是在 Pylons 中运行的。这是控制器操作的一些代码：

def test_tb(self):
    import traceback
    return a.lib.htmlencode(traceback.extract_stack())

它生成一个网页，所以

[]

，我认为它与对象的构造函数或类似的东西没有任何关系。它是否与某些类型的线程和回溯模块或类似的东西之间的不兼容有关？

原文

I have a class that calls

traceback.extract_stack()

in its __init__(), but whenever I do that, the value of traceback.extract_stack() is [].

What are some reasons that this could be the case?
Is there another way to get a traceback that will be more reliable?

I think the problem is that the code is running in Pylons. Here is some code for a controller action:

def test_tb(self):
    import traceback
    return a.lib.htmlencode(traceback.extract_stack())

It generates a webpage that is just

[]

So, I don't think it has anything to do with being in the constructor of an object or anything like that. Could it have to do with an incompatibility between some kinds of threading and the traceback module or something like that?

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嗼ふ静 2024-08-06 03:20:17

下面显示了从类的 __init__ 方法调用时traceback.extract_stack() 的工作情况。请发布您的代码，表明它不起作用。包括 Python 版本。不要凭记忆打字；像我一样使用复制/粘贴。

Python 2.6.2 (r262:71605, Apr 14 2009, 22:40:02) [MSC v.1500 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import traceback as tb
>>> tb.extract_stack()
[('<stdin>', 1, '<module>', None)]
>>> def func():
...     print tb.extract_stack()
...
>>> func()
[('<stdin>', 1, '<module>', None), ('<stdin>', 2, 'func', None)]
>>> class Klass(object):
...     def __init__(self):
...         print tb.extract_stack()
...
>>> k = Klass()
[('<stdin>', 1, '<module>', None), ('<stdin>', 3, '__init__', None)]
>>>

更新不要查看return a.lib.htmlencode(traceback.extract_stack())并想知道，而是进入管道：

(1) do tb_stack = repr ((traceback.extract_stack()) 并将结果写入日志文件以进行检查

(2) 执行 return a.lib.htmlencode(some_known_constant_data) 并检查已知数据是否正确显示您期望它出现的地方。

Following shows traceback.extract_stack() working when called from a class's __init__ method. Please post your code showing that it doesn't work. Include the Python version. Don't type from memory; use copy/paste as I have done.

Python 2.6.2 (r262:71605, Apr 14 2009, 22:40:02) [MSC v.1500 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import traceback as tb
>>> tb.extract_stack()
[('<stdin>', 1, '<module>', None)]
>>> def func():
...     print tb.extract_stack()
...
>>> func()
[('<stdin>', 1, '<module>', None), ('<stdin>', 2, 'func', None)]
>>> class Klass(object):
...     def __init__(self):
...         print tb.extract_stack()
...
>>> k = Klass()
[('<stdin>', 1, '<module>', None), ('<stdin>', 3, '__init__', None)]
>>>

UPDATE Instead of looking at return a.lib.htmlencode(traceback.extract_stack()) and wondering, tap into the pipeline:

(1) do tb_stack = repr((traceback.extract_stack()) and write the result to your logfile for checking

(2) do return a.lib.htmlencode(some_known_constant_data) and check that the known data shows up correctly where you expect it to show up.

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