Added error information on assert failure

[ais.git] / bin / ntools.py

diff --git a/bin/ntools.py b/bin/ntools.py
index 61085dbb831c0e18b9bec8f4088fea4272b4bd24..3236319f676c1cb6c06b5c1692991be2a04b9409 100644 (file)
--- a/bin/ntools.py
+++ b/bin/ntools.py
@@ -59,7 +59,7 @@ def strmmsi_to_mmsi(strmmsi):
     if strmmsi.isdigit():
         return int(strmmsi)
     else:
-        assert strmmsi[3:5] == 'MI'
+        assert strmmsi[3:5] == 'MI', 'Invalid strmmsi ' + strmmsi
         strmmsi = strmmsi[:3]+'00'+strmmsi[5:]
         return int('-'+strmmsi)