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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def value_to_jam(value, methods=False):
 """Makes a token to refer to a Python value inside Jam language code. The token is merely a string that can be passed around in Jam code and eventually passed back. For example, we might want to pass PropertySet instance to a tag function and it might eventually call back to virtual_target.add_suffix_and_prefix, passing the same instance. For values that are classes, we'll also make class methods callable from Jam. Note that this is necessary to make a bit more of existing Jamfiles work. This trick should not be used to much, or else the performance benefits of Python port will be eaten. """


    global __value_id

    r = __python_to_jam.get(value, None)
    if r:
        return r

    exported_name = '###_' + str(__value_id)
    __value_id = __value_id + 1
    __python_to_jam[value] = exported_name
    __jam_to_python[exported_name] = value

    if methods and type(value) == types.InstanceType:
        for field_name in dir(value):
            field = getattr(value, field_name)
            if callable(field) and not field_name.startswith("__"):
                bjam.import_rule("", exported_name + "." + field_name, field)

    return exported_name