Sum fixes

Auto Trans/differ.py

@@ -3,24 +3,35 @@
 #... I haven't actually tried this yet, it might work, it might not.
 # If it doesn't. Call my number (It's hidden in your ear!).
 
-import csv
+def main():
+  # Open the input files
+  file1 = open("file1.csv", "r", encoding="utf8")
+  file2 = open("file2.csv", "r", encoding="utf8")
 
-def compare_csv_files(file1, file2):
-    # read the files line by line and store them in sets
-    with open(file1, 'r') as f1:
-        lines1 = set(f1.readlines())
-    with open(file2, 'r') as f2:
-        lines2 = set(f2.readlines())
+  # Read the contents of the input files into variables
+  text1 = file1.readlines()
+  text2 = file2.readlines()
 
-    # find the lines that are present only in one of the files
-    only_in_file1 = lines1 - lines2
-    only_in_file2 = lines2 - lines1
+  # Close the input files
+  file1.close()
+  file2.close()
 
-    # write the lines to a new file
-    with open('comparison_result.csv', 'w') as result_file:
-        writer = csv.writer(result_file)
-        writer.writerows(only_in_file1)
-        writer.writerows(only_in_file2)
+  # Create a set of the lines in each file
+  lines1 = set(text1)
+  lines2 = set(text2)
 
+  # Calculate the difference between the sets
+  diff = lines2.difference(lines1)
 
-compare_csv_files('file1.csv', 'file2.csv')
+  # Open the output file
+  output_file = open("diff.csv", "w", encoding="utf8")
+
+  # Write the difference to the output file
+  for line in diff:
+    output_file.write(line)
+
+  # Close the output file
+  output_file.close()
+
+if __name__ == "__main__":
+  main()