# Copyright 2006-2016 Mark Diekhans
from __future__ import print_function
import pickle
import sys
import os
import traceback
import signal
from warnings import warn


def _signal_num_to_name(num):
    "get name for a signal number"
    # find name in signal namespace
    for key in vars(signal):
        if (getattr(signal, key) == num) and key.startswith("SIG") and (key.find("_") < 0):
            return key
    return "signal" + str(num)


def test1():
    gotEx = None
    try:
        try:
            raise ValueError("I am not valued")
        except Exception as ex:
            raise Exception("got one") from ex
    except Exception as ex2:
        gotEx = ex2
        
    print("orig:", gotEx, "from", gotEx.__cause__)
    p = pickle.dumps(gotEx, pickle.HIGHEST_PROTOCOL)
    gotEx2 = pickle.loads(p)
    print("load:", gotEx2, "from", gotEx2.__cause__)

test1()