switch smartpgp-cli to Python3

bin/smartpgp-cli

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # SmartPGP : JavaCard implementation of OpenPGP card v3 specification
 # https://github.com/ANSSI-FR/SmartPGP
@@ -83,8 +83,8 @@ def parse_args(ctx):
             varname = args.pin[4:]
             try:
                 ctx.admin_pin=os.environ[varname]
-            except KeyError,e:
-                print "Environment variable %s not found" % varname
+            except KeyError:
+                print("Environment variable %s not found" % varname)
                 sys.exit(1)
         else:
             ctx.admin_pin = args.pin
@@ -103,8 +103,8 @@ def main():
     if args.command in VALID_COMMANDS:
         VALID_COMMANDS[args.command](ctx)
     else:
-        print "Unknown command '%s'" % args.command
-        print "Run '%s -h' for help" % sys.argv[0]
+        print("Unknown command '%s'" % args.command)
+        print("Run '%s -h' for help" % sys.argv[0])
         sys.exit(1)
 
 if __name__=='__main__':