Is this a good way to work with init and exception

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From	Cecil Westerhof <Cecil@decebal.nl>
Newsgroups	comp.lang.python
Subject	Is this a good way to work with init and exception
Date	Sun, 19 Jul 2015 12:35:16 +0200
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I am using libturpial to post things on Twitter. But sometimes I get a
ServiceOverCapacity exception. So I wrote the following code.

======================================================================
class InitAlreadyDoneError(Exception):
    pass


##### Functions
def init(max_tries = 5, wait_time = 60):
    global _core

    if _core != None:
        raise InitAlreadyDoneError
    tries = 0
    while True:
        try:
            _core = Core()
            break
        except ServiceOverCapacity:
            tries += 1
            sys.stderr.write('Tried to init _core it {0} times\n'.format(tries))
            sys.stderr.flush()
            if tries >= max_tries:
                raise
            time.sleep(wait_time)
======================================================================

Is this the correct way to work user defined exceptions, or should I
also define a default message?

I use this in the following way:
    import twitterDecebal
    twitterDecebal.init()

Because you can not give parameters with an import as far as I can
see. Is this a good way to do this, or is there a better way?

-- 
Cecil Westerhof
Senior Software Engineer
LinkedIn: http://www.linkedin.com/in/cecilwesterhof

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Is this a good way to work with init and exception Cecil Westerhof <Cecil@decebal.nl> - 2015-07-19 12:35 +0200
  Re: Is this a good way to work with init and exception Chris Angelico <rosuav@gmail.com> - 2015-07-19 22:59 +1000
    Re: Is this a good way to work with init and exception Cecil Westerhof <Cecil@decebal.nl> - 2015-07-19 18:46 +0200
      Re: Is this a good way to work with init and exception Chris Angelico <rosuav@gmail.com> - 2015-07-20 04:11 +1000
        Re: Is this a good way to work with init and exception Cecil Westerhof <Cecil@decebal.nl> - 2015-07-19 21:10 +0200
          Re: Is this a good way to work with init and exception Chris Angelico <rosuav@gmail.com> - 2015-07-20 07:08 +1000
            Re: Is this a good way to work with init and exception Cecil Westerhof <Cecil@decebal.nl> - 2015-07-20 00:19 +0200
              Re: Is this a good way to work with init and exception Chris Angelico <rosuav@gmail.com> - 2015-07-20 08:40 +1000
                Re: Is this a good way to work with init and exception Cecil Westerhof <Cecil@decebal.nl> - 2015-07-20 01:27 +0200

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