Moved LockError into exceptions.py

from threading import ThreadError

class TaskDeniedException(Exception):

    pass

class LockError(ThreadError):

    ERROR_CODES = {

        'ACQUIRE_ERROR': "Unable to acquire. Lock in use by another thread.",

        'IN_USE_ERROR': "Lock in use by another thread."

    }

    def __init__(self, code, lock):

        self.code = code

        if code in LockError.ERROR_CODES:

            self.message = LockError.ERROR_CODES[code]

        else:

            self.message = "Unknown error."

        print("{}: {}".format(self.code, self.message))

        ThreadError.__init__(self)

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