diff --git a/call.cgi b/call.cgi
index 2f7af7f..61e9ae4 100755
--- a/call.cgi
+++ b/call.cgi
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # encoding: utf-8
 import os
 import sys
@@ -8,7 +8,6 @@
 import sqlite3
 from datetime import datetime
 from datetime import timedelta
-import pprint
 
 if sys.argv[-1] == "--test":
     logdir="./"
@@ -71,7 +70,7 @@
 c    = conn.cursor()
 query= "SELECT number, name_kanji, name_kana, depart_name, pos_code FROM user WHERE id = ?"
 
-for machine in db.keys():
+for machine in list(db.keys()):
     candidate = []
     active = False
     reject = False
@@ -147,8 +146,8 @@
 conn.close()
 
 if not "excel" in form:
-    print "Content-Type: application/json"
-    print ""
+    print("Content-Type: application/json")
+    print("")
 
     json.dump(lines, sys.stdout)
 else:
@@ -162,9 +161,9 @@
 
     lines.sort(lambda x,y: cmp(x[4]+x[1],y[4]+y[1]))
     for room in ["GRL", "ML1", "ML2", "IML"]:
-        wb.remove(wb[room+u"出席表"])
+        wb.remove(wb[room+"出席表"])
         if room in form:
-            ws = wb.create_sheet(title = room+u"出席表")
+            ws = wb.create_sheet(title = room+"出席表")
             ws.sheet_properties.pageSetUpPr.fitToPage = True
             if room == "IML":
                 prefix = "HSJ"
@@ -243,16 +242,16 @@
             tab.tableStyleInfo = style
             ws.add_table(tab)
         else:
-            wb.remove(wb[room+u"座席表"])
+            wb.remove(wb[room+"座席表"])
 
     filename="attendancebook"+fr.strftime("%Y%m%d%H%M")+".xlsx"
     tname= tempfile.mktemp(filename)
     wb.save(tname)
     with open(tname,"rb") as f:
         finfo = os.stat(tname)
-        print "Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
-        print 'Content-Disposition: attachment; filename="'+filename+'"'
-        print 'Content-Length: '+str(finfo.st_size)
-        print ""
+        print("Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet")
+        print('Content-Disposition: attachment; filename="'+filename+'"')
+        print('Content-Length: '+str(finfo.st_size))
+        print("")
         sys.stdout.write(f.read())