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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 attachAccept(PTmsiSignature_presence=0, GprsTimer_presence=0, MobileId_presence=0, MobileId_presence1=0, GmmCause_presence=0):
 """ATTACH ACCEPT Section 9.4.2"""

    a = TpPd(pd=0x3)
    b = MessageType(mesType=0x2)  # 00000010
    c = AttachResult()
    d = ForceToStandby()
    e = GprsTimer()
    f = RadioPriorityAndSpareHalfOctets()
    h = RoutingAreaIdentification()
    packet = a / b / c / d / e / f / h
    if PTmsiSignature_presence is 1:
        i = PTmsiSignature(ieiPTS=0x19)
        packet = packet / i
    if GprsTimer_presence is 1:
        j = GprsTimer(ieiGT=0x17)
        packet = packet / j
    if MobileId_presence is 1:
        k = MobileIdHdr(ieiMI=0x18, eightBitMI=0x0)
        packet = packet / k
    if MobileId_presence1 is 1:
        l = MobileIdHdr(ieiMI=0x23, eightBitMI=0x0)
        packet = packet / l
    if GmmCause_presence is 1:
        m = GmmCause(ieiGC=0x25)
        packet = packet / m
    return packet