How to use the pprofile.LocalDescriptor function in pprofile

dikt = __main__.__dict__
        return self.runctx(cmd, dikt, dikt)

class ThreadProfile(Profile):
    """
    threading.Thread-aware version of Profile class.

    Threads started after enable() call will be profiled.
    After disable() call, threads will need to be switched into and trigger a
    trace event (typically a "line" event) before they can notice the
    disabling.
    """
    __slots__ = ('_local_trace_backup', )

    stack = LocalDescriptor(_initStack)
    global_dict = LocalDescriptor(dict)

    def __init__(self, **kw):
        super(ThreadProfile, self).__init__(**kw)
        self._local_trace_backup = self._local_trace

    def _enable(self):
        self._local_trace = self._local_trace_backup
        threading.settrace(self._global_trace)
        super(ThreadProfile, self)._enable()

    def _disable(self):
        super(ThreadProfile, self)._disable()
        threading.settrace(None)
        self._local_trace = None

class StatisticProfile(ProfileBase, ProfileRunnerBase):

def __init__(self, func=None):
        """
        func (callable)
          If provided, called when a missing property is accessed
          (ex: accessing thread never initialised that property).
          If None, AttributeError is raised.
        """
        super(LocalDescriptor, self).__init__()
        if func is not None:
            self.func = func

import __main__
        dikt = __main__.__dict__
        return self.runctx(cmd, dikt, dikt)

class ThreadProfile(Profile):
    """
    threading.Thread-aware version of Profile class.

    Threads started after enable() call will be profiled.
    After disable() call, threads will need to be switched into and trigger a
    trace event (typically a "line" event) before they can notice the
    disabling.
    """
    __slots__ = ('_local_trace_backup', )

    stack = LocalDescriptor(_initStack)
    global_dict = LocalDescriptor(dict)

    def __init__(self, **kw):
        super(ThreadProfile, self).__init__(**kw)
        self._local_trace_backup = self._local_trace

    def _enable(self):
        self._local_trace = self._local_trace_backup
        threading.settrace(self._global_trace)
        super(ThreadProfile, self)._enable()

    def _disable(self):
        super(ThreadProfile, self)._disable()
        threading.settrace(None)
        self._local_trace = None