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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 remove_from_postmortem_exclusion_list(cls, pathname, bits = None):
 """ Removes the given filename to the exclusion list for postmortem debugging from the Registry. @warning: This method requires administrative rights. @warning: Don't ever delete entries you haven't created yourself! Some entries are set by default for your version of Windows. Deleting them might deadlock your system under some circumstances. For more details see: U{http://msdn.microsoft.com/en-us/library/bb204634(v=vs.85).aspx} @see: L{get_postmortem_exclusion_list} @type pathname: str @param pathname: Application pathname to remove from the postmortem debugging exclusion list. @type bits: int @param bits: Set to C{32} for the 32 bits debugger, or C{64} for the 64 bits debugger. Set to {None} for the default (L{System.bits}). @raise WindowsError: Raises an exception on error. """

        if bits is None:
            bits = cls.bits
        elif bits not in (32, 64):
            raise NotImplementedError("Unknown architecture (%r bits)" % bits)

        if bits == 32 and cls.bits == 64:
            keyname = 'HKLM\\SOFTWARE\\Wow6432Node\\Microsoft\\Windows NT\\CurrentVersion\\AeDebug\\AutoExclusionList'
        else:
            keyname = 'HKLM\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\AeDebug\\AutoExclusionList'

        try:
            key = cls.registry[keyname]
        except KeyError:
            return

        try:
            del key[pathname]
        except KeyError:
            return