Python：打印异常的完整回溯

Question

有没有办法教Python（3.x）显示异常的整个堆栈跟踪？例如：

def foo(n):
    try:
        1/n
    except Exception as x:
        return x
    else:
        return foo(n-1)

def bar(x):
    raise x

bar(foo(3))

发射

Traceback (most recent call last):
  File "/tmp/test.py", line 17, in <module>
    bar(foo(3))
  File "/tmp/test.py", line 15, in bar
    raise x
  File "/tmp/test.py", line 7, in foo
    1/n
ZeroDivisionError: division by zero

不幸的是，foo()的调用上下文被抑制了。将traceback.print_stack(x.__traceback__.tb_frame)添加到bar()打印

  File "/tmp/test.py", line 18, in <module>
    bar(foo(3))
  File "/tmp/test.py", line 13, in foo
    return foo(n-1)
  File "/tmp/test.py", line 13, in foo
    return foo(n-1)
  File "/tmp/test.py", line 13, in foo
    return foo(n-1)
  File "/tmp/test.py", line 5, in foo
    return x

表明信息不会丢失。我想说服Python在打印错误时包含这些行。