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A simple algorithm: for every branch connected to a bus in list BUSES2, write a "branch off" contingency:

path = <path to case>
psspy.case(path+'\\savnw.sav')
ctgfile = path + '\\P2.con'
BUSES2 = [154, 153, 203]

def GetBranches(x):
    tobusArray=[]
    CktArray=[]
    ierr = psspy.inibrn(x,2)
    while ierr==0:
        ierr, NextBus, NextCkt = psspy.nxtbrn(x) 
        if ierr == 0:
            tobusArray.append(NextBus)
            CktArray.append(str(NextCkt))
    return tobusArray, CktArray
#_________________________________________________________   
temp1 = []
text_file = open(ctgfile,'w')
for StartBus in BUSES2:
    temp1.append(StartBus)
    tobuses=[]
    ckts = []
    tobuses,ckts = GetBranches(StartBus)
    print('Branches off bus ',StartBus)
    print(tobuses, ckts)
    for i in range(len(tobuses)):
        jbus = tobuses[i]
        ickt = ckts[i]
        if jbus in temp1:continue   # already branch processed!
        # write ctg txt
        text_file.write('CONTINGENCY Branch_%s-%s-%s\n' %(StartBus, jbus, ickt))
        text_file.write('DISCONNECT BRANCH FROM BUS %s TO BUS %s CKT %s\n' %(StartBus, jbus, ickt))
        text_file.write('END\n')         
text_file.close()