Code:
nubr1 = 0
s = open("C:/DsE2/T1.txt").read()

while nubr1 <=5:
    lib1l[nubr1] = open("C:/DsE2/lib001.txt").readlines()[nubr1]
    lib2l[nubr1] = open("C:/DsE2/lib002.txt").readlines()[nubr1]
    s = s.replace( lib1l[nubr1] ,lib2l[nubr1] )
    nubr1 = nubr1 + 1


f = open("C:/DsE2/T1.txt", 'w')
f.write(s)
f.close()
is this...