# lib.py

class Bads(Exception):

class Bad1(Bads): pass
class Bad2(Bads): pass

def func1():
    ...
    raise Bad1(99, 'spam.txt')

def func2():
    ...
    raise Bad2(42, 'input')

--------------------------

# client.py

import lib

try:
    lib.func1()
except Bads as X:
    print X.args[0], X.args[1]