Compare two files with numbers, one number in one line: python version

setdifferencenum.py

"""
# A shorter ugly version

total = set([i.strip() for i in open("total.txt").readlines()]) # list comprehension to remove \r\n from lines
coupon = set([i.strip() for i in open("coupon.txt").readlines()]) # set to remove duplicates and do set difference
open("result.txt", "w").write('\n'.join(sorted(total-coupon))) # use set difference and use sorted to sort then write in separate lines
"""


### Now see same thing above in beautiful & readable way

# reading file content into list
total = open("total.txt").readlines() 
coupon = open("coupon.txt").readlines()

# striping "\r\n and/or spaces at ends from each line
total = [i.strip() for i in total]
coupon = [i.strip() for i in coupon]

#creating sets from list
total_set = set(total)
coupon_set = set(coupon)

# finding set difference
difference = total_set - coupon_set

#sorting the result
sorted_difference = sorted(difference)

# writing the result back into file, one number in a line
f_result = open("result.txt", "w")
f_result.write('\n'.join(sorted_diffrence))
f_result.close()