Add note about unicode_literals and spawnu

1 files changed, 4 insertions, 0 deletions

diff --git a/examples/ftp.py b/examples/ftp.py
index 678d032..a1c1343 100755
--- a/examples/ftp.py
+++ b/examples/ftp.py
@@ -31,7 +31,11 @@ from __future__ import unicode_literals
 import pexpect
 import sys
 
+# Note that, for Python 3 compatibility reasons, we are using spawnu and
+# importing unicode_literals (above). spawnu accepts Unicode input and
+# unicode_literals makes all string literals in this script Unicode by default.
 child = pexpect.spawnu('ftp ftp.openbsd.org')
+
 child.expect('(?i)name .*: ')
 child.sendline('anonymous')
 child.expect('(?i)password')