Raising vs reraising

raising.py

import sys


def foo():
    bar()


def bar():
    baz()


def baz():
    raise Exception("whoops")


def raises():
    try:
        foo()
    except Exception:
        raise


def reraises():
    try:
        foo()
    except Exception as exc:
        raise exc


if sys.argv[1] == "raise":
    raises()
elif sys.argv[1] == "reraise":
    reraises()

$ python raising.py raise
Traceback (most recent call last):
  File "raising.py", line 31, in <module>
    raises()
  File "raising.py", line 18, in raises
    foo()
  File "raising.py", line 5, in foo
    bar()
  File "raising.py", line 9, in bar
    baz()
  File "raising.py", line 13, in baz
    raise Exception("whoops")
Exception: whoops

vs

$ python raising.py reraise
Traceback (most recent call last):
  File "raising.py", line 33, in <module>
    reraises()
  File "raising.py", line 27, in reraises
    raise exc
Exception: whoops