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

请参阅traceback模块，特别是format_exc()函数。在这里。

import traceback

try:
    raise ValueError
except ValueError:
    tb = traceback.format_exc()
else:
    tb = "No error"
finally:
    print tb

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。

我定义了以下helper类:

import traceback
class TracedExeptions(object):
    def __init__(self):
        pass
    def __enter__(self):
        pass

    def __exit__(self, etype, value, tb):
      if value :
        if not hasattr(value, 'traceString'):
          value.traceString = "\n".join(traceback.format_exception(etype, value, tb))
        return False
      return True

我以后可以这样使用:

with TracedExeptions():
  #some-code-which-might-throw-any-exception

之后可以像这样消耗它:

def log_err(ex):
  if hasattr(ex, 'traceString'):
    print("ERROR:{}".format(ex.traceString));
  else:
    print("ERROR:{}".format(ex));

(背景:我很沮丧，因为使用承诺和异常一起，不幸的是将异常在一个地方引发到另一个地方的on_rejected处理程序，因此很难从原始位置获得回溯)

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 !!