How to use the gprof2dot.Object function in gprof2dot

def __getitem__(self, event):
        try:
            return self.events[event]
        except KeyError:
            raise UndefinedEvent(event)
    
    def __setitem__(self, event, value):
        if value is None:
            if event in self.events:
                del self.events[event]
        else:
            self.events[event] = value


class Call(Object):
    """A call between functions.
    
    There should be at most one call object for every pair of functions.
    """

    def __init__(self, callee_id):
        Object.__init__(self)
        self.callee_id = callee_id
        self.ratio = None
        self.weight = None


class Function(Object):
    """A function."""

    def __init__(self, id, name):

def __init__(self):
        Object.__init__(self)
        self.functions = set()

    def add_function(self, function):
        assert function not in self.functions
        self.functions.add(function)
        if function.cycle is not None:
            for other in function.cycle.functions:
                if function not in self.functions:
                    self.add_function(other)
        function.cycle = self


class Profile(Object):
    """The whole profile."""

    def __init__(self):
        Object.__init__(self)
        self.functions = {}
        self.cycles = []

    def add_function(self, function):
        if function.id in self.functions:
            sys.stderr.write('warning: overwriting function %s (id %s)\n' % (function.name, str(function.id)))
        self.functions[function.id] = function

    def add_cycle(self, cycle):
        self.cycles.append(cycle)

    def validate(self):

class Call(Object):
    """A call between functions.
    
    There should be at most one call object for every pair of functions.
    """

    def __init__(self, callee_id):
        Object.__init__(self)
        self.callee_id = callee_id
        self.ratio = None
        self.weight = None


class Function(Object):
    """A function."""

    def __init__(self, id, name):
        Object.__init__(self)
        self.id = id
        self.name = name
        self.module = None
        self.process = None
        self.calls = {}
        self.called = None
        self.weight = None
        self.cycle = None
        self.filename = None
    
    def add_call(self, call):
        if call.callee_id in self.calls:

# Strip template parameters from name by recursively removing paired angles
        while True:
            name, n = self._angles_re.subn('', name)
            if not n:
                break

        return name

    # TODO: write utility functions

    def __repr__(self):
        return self.name


class Cycle(Object):
    """A cycle made from recursive function calls."""

    def __init__(self):
        Object.__init__(self)
        self.functions = set()

    def add_function(self, function):
        assert function not in self.functions
        self.functions.add(function)
        if function.cycle is not None:
            for other in function.cycle.functions:
                if function not in self.functions:
                    self.add_function(other)
        function.cycle = self