<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def setupWorkerTransition():
 """Hook Twisted deprecation machinery to use custom warning class for Worker API deprecation warnings."""


    default_warn_method = getWarningMethod()

    def custom_warn_method(message, category, stacklevel):
        if stacklevel is not None:
            stacklevel += 1
        if _WORKER_WARNING_MARK in message:
            # Message contains our mark - it's Worker API Renaming warning,
            # issue it appropriately.
            message = message.replace(_WORKER_WARNING_MARK, "")
            warnings.warn(
                DeprecatedWorkerNameWarning(message), message, stacklevel)
        else:
            # Other's warning message
            default_warn_method(message, category, stacklevel)

    setWarningMethod(custom_warn_method)