diff --git a/dronekit/__init__.py b/dronekit/__init__.py
index bc05a7098..1772b2bb8 100644
--- a/dronekit/__init__.py
+++ b/dronekit/__init__.py
@@ -48,7 +48,9 @@
 import time
 
 import monotonic
-from past.builtins import basestring
+
+if sys.version_info.major >= 3:
+    basestring = str
 
 from pymavlink import mavutil, mavwp
 from pymavlink.dialects.v10 import ardupilotmega
diff --git a/examples/mission_import_export/exportedmission.txt b/examples/mission_import_export/exportedmission.txt
new file mode 100644
index 000000000..a619ee553
--- /dev/null
+++ b/examples/mission_import_export/exportedmission.txt
@@ -0,0 +1,8 @@
+QGC WPL 110
+0	1	0	16	0	0	0	0	-35.36326217651367	149.1652374267578	583.989990234375	1
+1	0	0	22	0.0	0.0	0.0	0.0	-35.36198806762695	149.16375732421875	100.0	1
+2	0	0	16	0.0	0.0	0.0	0.0	-35.36199188232422	149.16358947753906	100.0	1
+3	0	0	16	0.0	0.0	0.0	0.0	-35.36381149291992	149.16360473632812	100.0	1
+4	0	0	16	0.0	0.0	0.0	0.0	-35.36376953125	149.1660614013672	100.0	1
+5	0	0	16	0.0	0.0	0.0	0.0	-35.36183547973633	149.166015625	100.0	1
+6	0	0	16	0.0	0.0	0.0	0.0	-35.36214828491211	149.1650390625	100.0	1