ArtemZA

first = 'master.txt'
second = 'file.txt'
directory = 'C:\\new\\'

A = []
B = []
C = []
D = []


def FileRead(file):
    f = open(directory + file , 'r' , encoding = "utf-8")
    for i in f:
        if q == 0:
            A.append(i)
        if q == 1:
            B.append(i)
    f.close()
   
def FileWrite(file,spisok):
    f = open(directory + file , 'w')
    for line in spisok:
        f.write(line + '\n')
    f.close()
        
  
for q in range(0,2):
    if q == 0:
        FileRead(first)
    if q == 1:
        FileRead(second)

A = [line.rstrip() for line in A]
B = [line.rstrip() for line in B]
for i in A:
    if not i in B:
        print(i)
        C.append(i)

for i in B:
    if i in A:
        print(i)
        C.append(i)

for i in B:
    if not i in A:
        print(i)
        C.append(i)
        D.append(i)

FileWrite('newmaster.txt', D)
FileWrite('new.txt',C)