[Expo-tech] python 2to3 - troggle

[Philip Sargent (Gmail)]

Just for fun I just ran the python 2to3 convert utility on a copy of troggle:
only 35 files touched (out of 76 .py), mostly import, print and raise changes,
and wherever an imported function is used it changes too, and use of Type:
-        s = urllib.urlopen(sdir)
+        s = urllib.request.urlopen(sdir)

-                if type(surveyNumber)==types.TupleType:
+                if type(surveyNumber)==tuple:

All the changes look very straightforward and don't look as if any would be any trouble at all. 
Though some I think are stylistic:
-    headers = surveyreader.next()
+    headers = next(surveyreader)

Apart from the odd little thing where it always explicitly casts to a list:
-    for key, value in extra_context.items():
+    for key, value in list(extra_context.items()):


Since django >1.5 supports both python2 and python3, and we are on django 1.7
it looks to me that upgrading from python2 to python3 *might* be very quick indeed.
Which would be useful as Ubuntu 20.04 would be a lot happier.

Before I have a go on my copy, has anyone else tried this and if so what gotchas should
I look out for ? 
Will the third-party libraries bork badly ?

It looks like imagekit module is not used and is mentioned only in the ancient wiki/externalapps.wiki 
(and it looks like troggle used to use https://github.com/feincms/feincms/ but no more)

Philip

PS
This looks much easier than the django upgrades which Sam has been doing
https://docs.djangoproject.com/en/3.0/releases/2.0/
https://docs.djangoproject.com/en/3.0/howto/upgrade-version/