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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 cftype_to_value(cftype):
 """Convert a CFType into an equivalent python type. The convertible CFTypes are taken from the known_cftypes dictionary, which may be added to if another library implements its own conversion methods."""

    if not cftype:
        return None
    typeID = cf.CFGetTypeID(cftype)
    if typeID in known_cftypes:
        convert_function = known_cftypes[typeID]
        return convert_function(cftype)
    else:
        return cftype