如何将捕获的异常(其描述和堆栈跟踪)转换为外部使用的str ?
try:
method_that_can_raise_an_exception(params)
except Exception as e:
print(complete_exception_description(e))
如何将捕获的异常(其描述和堆栈跟踪)转换为外部使用的str ?
try:
method_that_can_raise_an_exception(params)
except Exception as e:
print(complete_exception_description(e))
当前回答
如果你想将你的回溯转换为dict的列表(适用于python > 3.5):
from traceback import TracebackException
def list_traceback(exc_value: BaseException):
result = list()
# get previous fails, so errors are appended by order of execution
if exc_value.__context__:
result += list_traceback(exc_value.__context__)
# convert Exception into TracebackException
tbe = TracebackException.from_exception(exc_value)
# get stacktrace (cascade methods calls)
error_lines = list()
for frame_summary in tbe.stack:
summary_details = {
'filename': frame_summary.filename,
'method' : frame_summary.name,
'lineno' : frame_summary.lineno,
'code' : frame_summary.line
}
error_lines.append(summary_details)
# append error, by order of execution
result.append({"error_lines": error_lines,
"type" : tbe.exc_type.__name__,
"message" : str(tbe)})
return result
这将是结果(一个例子):
[
{
"error_lines": [
{
"filename": "/home/demo/file2.py",
"method": "do_error_2",
"lineno": 18,
"code": "a=1/0"
}
],
"type": "ZeroDivisionError",
"message": "division by zero"
},
{
"error_lines": [
{
"filename": "/home/demo/file_main.py",
"method": "demo2",
"lineno": 50,
"code": "file2.DEMO().do_error_2()"
},
{
"filename": "/home/demo/file2.py",
"method": "do_error_2",
"lineno": 20,
"code": "raise AssertionError(\"Raised inside the except, after division by zero\")"
}
],
"type": "AssertionError",
"message": "Raised inside the except, after division by zero"
}
]
其他回答
如果您希望在未处理异常时获得相同的信息,可以这样做。执行import trace,然后:
try:
...
except Exception as e:
print(traceback.print_tb(e.__traceback__))
我使用的是Python 3.7。
我的2美分。
import sys, traceback
try:
...
except Exception, e:
T, V, TB = sys.exc_info()
print ''.join(traceback.format_exception(T,V,TB))
>>> import sys
>>> import traceback
>>> try:
... 5 / 0
... except ZeroDivisionError as e:
... type_, value_, traceback_ = sys.exc_info()
>>> traceback.format_tb(traceback_)
[' File "<stdin>", line 2, in <module>\n']
>>> value_
ZeroDivisionError('integer division or modulo by zero',)
>>> type_
<type 'exceptions.ZeroDivisionError'>
>>>
>>> 5 / 0
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ZeroDivisionError: integer division or modulo by zero
您可以使用sys.exc_info()收集信息,并使用traceback模块中的函数对其进行格式化。 下面是一些格式化的例子。
整个异常字符串位于:
>>> ex = traceback.format_exception(type_, value_, traceback_)
>>> ex
['Traceback (most recent call last):\n', ' File "<stdin>", line 2, in <module>\n', 'ZeroDivisionError: integer division or modulo by zero\n']
对于Python 3.5+ 使用回溯。TracebackException,它可以处理在任何地方捕获的异常。
def print_trace(ex: BaseException):
print(''.join(traceback.TracebackException.from_exception(ex).format()))
例子
import traceback
try:
1/0
except Exception as ex:
print(''.join(traceback.TracebackException.from_exception(ex).format()))
> >输出
Traceback (most recent call last):
File "your_file_name_here.py", line 29, in <module>
1/0
ZeroDivisionError: division by zero
它与from_exec()和format_exception()相同:
a = ''.join(traceback.TracebackException.from_exception(ex).format())
b = traceback.format_exc()
c = ''.join(traceback.format_exception(type(ex), ex, ex.__traceback__))
print(a == b == c) # This is True !!
您也可以考虑使用内置的Python模块cgitb,以获得一些非常好的、格式化良好的异常信息,包括局部变量值、源代码上下文、函数参数等。
例如这段代码…
import cgitb
cgitb.enable(format='text')
def func2(a, divisor):
return a / divisor
def func1(a, b):
c = b - 5
return func2(a, c)
func1(1, 5)
我们得到这个异常输出…
ZeroDivisionError
Python 3.4.2: C:\tools\python\python.exe
Tue Sep 22 15:29:33 2015
A problem occurred in a Python script. Here is the sequence of
function calls leading up to the error, in the order they occurred.
c:\TEMP\cgittest2.py in <module>()
7 def func1(a, b):
8 c = b - 5
9 return func2(a, c)
10
11 func1(1, 5)
func1 = <function func1>
c:\TEMP\cgittest2.py in func1(a=1, b=5)
7 def func1(a, b):
8 c = b - 5
9 return func2(a, c)
10
11 func1(1, 5)
global func2 = <function func2>
a = 1
c = 0
c:\TEMP\cgittest2.py in func2(a=1, divisor=0)
3
4 def func2(a, divisor):
5 return a / divisor
6
7 def func1(a, b):
a = 1
divisor = 0
ZeroDivisionError: division by zero
__cause__ = None
__class__ = <class 'ZeroDivisionError'>
__context__ = None
__delattr__ = <method-wrapper '__delattr__' of ZeroDivisionError object>
__dict__ = {}
__dir__ = <built-in method __dir__ of ZeroDivisionError object>
__doc__ = 'Second argument to a division or modulo operation was zero.'
__eq__ = <method-wrapper '__eq__' of ZeroDivisionError object>
__format__ = <built-in method __format__ of ZeroDivisionError object>
__ge__ = <method-wrapper '__ge__' of ZeroDivisionError object>
__getattribute__ = <method-wrapper '__getattribute__' of ZeroDivisionError object>
__gt__ = <method-wrapper '__gt__' of ZeroDivisionError object>
__hash__ = <method-wrapper '__hash__' of ZeroDivisionError object>
__init__ = <method-wrapper '__init__' of ZeroDivisionError object>
__le__ = <method-wrapper '__le__' of ZeroDivisionError object>
__lt__ = <method-wrapper '__lt__' of ZeroDivisionError object>
__ne__ = <method-wrapper '__ne__' of ZeroDivisionError object>
__new__ = <built-in method __new__ of type object>
__reduce__ = <built-in method __reduce__ of ZeroDivisionError object>
__reduce_ex__ = <built-in method __reduce_ex__ of ZeroDivisionError object>
__repr__ = <method-wrapper '__repr__' of ZeroDivisionError object>
__setattr__ = <method-wrapper '__setattr__' of ZeroDivisionError object>
__setstate__ = <built-in method __setstate__ of ZeroDivisionError object>
__sizeof__ = <built-in method __sizeof__ of ZeroDivisionError object>
__str__ = <method-wrapper '__str__' of ZeroDivisionError object>
__subclasshook__ = <built-in method __subclasshook__ of type object>
__suppress_context__ = False
__traceback__ = <traceback object>
args = ('division by zero',)
with_traceback = <built-in method with_traceback of ZeroDivisionError object>
The above is a description of an error in a Python program. Here is
the original traceback:
Traceback (most recent call last):
File "cgittest2.py", line 11, in <module>
func1(1, 5)
File "cgittest2.py", line 9, in func1
return func2(a, c)
File "cgittest2.py", line 5, in func2
return a / divisor
ZeroDivisionError: division by zero