In [14]:

    

import codecs
a1 = open('/Users/lipingzhang/Desktop/tmp/a.txt')

b1 = open('/Users/lipingzhang/Desktop/tmp/b.txt')

da = set([])
db = set([])

output = codecs.open('/Users/lipingzhang/Desktop/tmp/c.diff', 'w','utf-8')

for line in a1:
    sku1 = line.strip()
    if sku1 not in da:
        da.add(sku1)
for line in b1:
    sku2 = line.strip()
    if sku2 not in db:
        db.add(sku2)
        
dc = da.difference(db)

for diff in set(dc):
    output.write(str(diff))
    output.write("\n")
    
output.write("\n")
a1.close()
b1.close()
print ("Finished Diff.")


    

    




Finished Diff.

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