Remove lines in file A that are present in file B

RemoveLinesInFile.py

#!/usr/bin/python

# Delete all lines in file A (keep.txt) that are present in file B (delete.txt).
# Rules:
#  1. If line is found in B but not in A, then delete (i.e., do not merge files).
#  2. If line is found in B and in A too, then delete (i.e., delete duplicates).

# Read file with lines that we shall keep.
keepfile = open("keep.txt")
keeplines = keepfile.readlines()
keepfile.close()

# Read file with lines we should delete.
delfile = open("delete.txt")
dellines = delfile.readlines()
delfile.close()

keep, remove, total = 0, 0, 0

# Remove any new lines (\n) at the end.
keeplines = map(lambda s: s.strip(), keeplines)
dellines = map(lambda s: s.strip(), dellines)

for line in keeplines:
	if line not in dellines:
		keep = keep + 1
		print line
	else:
		remove = remove + 1
	total = total + 1

print
print "------------------------------"
print "Keep: " + str(keep)
print "Remove: " + str(remove)
print "Total iterations: " + str(total)
print "Total in both list: " + str(len(keeplines) + len(dellines))