--- a/add_input_name_as_column.py	Mon Dec 29 21:26:29 2014 +0100
+++ b/add_input_name_as_column.py	Wed Mar 06 09:15:49 2019 -0500
@@ -1,25 +1,25 @@
-import sys
+import io
 import argparse
 
+
 def Parser():
-  the_parser = argparse.ArgumentParser(description="add label to last column of file")
-  the_parser.add_argument('--input', required=True, action="store", type=str, help="input tabular file")
-  the_parser.add_argument('--output', required=True,  action="store", type=str, help="output file path")
-  the_parser.add_argument('--label', required=True, action="store", type=str, help="label to add in last column")
-  the_parser.add_argument('--header', action="store", type=str, help="column label for last column")
-  args = the_parser.parse_args()
-  return args
+    the_parser = argparse.ArgumentParser(description="add label to last column of file")
+    the_parser.add_argument('--input', required=True, action="store", type=str, help="input tabular file")
+    the_parser.add_argument('--output', required=True, action="store", type=str, help="output file path")
+    the_parser.add_argument('--label', required=True, action="store", type=str, help="label to add in last column")
+    the_parser.add_argument('--header', action="store", type=str, help="column label for last column")
+    args = the_parser.parse_args()
+    return args
 
-args=Parser()
 
-input=open(args.input)
-output=open(args.output, 'w')
-for i,line in enumerate(input):
-  line=line.strip('\n')
-  if (i==0) and (args.header!=None):
-    line=line+'\t'+args.header
-  else:
-    line=line+'\t'+args.label
-  print >>output, line
-input.close()
-output.close()
+args = Parser()
+
+
+with io.open(args.input, encoding="utf-8") as input, io.open(args.output, 'w', encoding="utf-8") as output:
+    for i, line in enumerate(input):
+        line = line.strip('\n')
+        if (i == 0) and args.header:
+            line = "%s\t%s\n" % (line, args.header)
+        else:
+            line = "%s\t%s\n" % (line, args.label)
+        output.write(line)