--- a/table-union.py	Fri Mar 09 11:14:02 2018 -0500
+++ b/table-union.py	Tue Oct 30 16:18:02 2018 -0400
@@ -4,7 +4,7 @@
 
 
 
-def main(files):
+def main(unionize=True, *files):
 	header = []
 	items = []
 	possible_identity_headers = None
@@ -15,6 +15,8 @@
 			for field in reader.fieldnames:
 				if field not in set(header):
 					header.append(field)
+				
+					
 				#try to find identity columns in the files, to use to join
 				if possible_identity_headers is None:
 					possible_identity_headers = set(reader.fieldnames)
@@ -30,7 +32,7 @@
 	# 	possible_identity_headers = set((possible_identity_headers.pop(), ))
 
 	#if we found an identity column, then try to join rows
-	if possible_identity_headers:
+	if possible_identity_headers and unionize:
 		key_column = possible_identity_headers.pop()
 		keys = set([r[key_column] for r in items])
 		merged_rows = []
@@ -47,4 +49,4 @@
 
 
 if __name__ == '__main__':
-	main(sys.argv[1:])
\ No newline at end of file
+	main(*sys.argv[1:])
\ No newline at end of file