SL-15742: Convert build scripts to Python 3

This changeset makes it possible to build the Second Life viewer using
Python 3. It is designed to be used with an equivalent Autobuild branch
so that a developer can compile without needing Python 2 on their
machine.

Breaking change: Python 2 support ending

Rather than supporting two versions of Python, including one that was
discontinued at the beginning of the year, this branch focuses on
pouring future effort into Python 3 only. As a result, scripts do not
need to be backwards compatible. This means that build environments,
be they on personal computers and on build agents, need to have a
compatible interpreter.

Notes

- SLVersionChecker will still use Python 2 on macOS
- Fixed the message template url used by template_verifier.py

1 files changed, 3 insertions, 3 deletions

diff --git a/indra/llmessage/tests/test_llsdmessage_peer.py b/indra/llmessage/tests/test_llsdmessage_peer.py
index 9cd2959ea1..5ba0749e31 100755
--- a/indra/llmessage/tests/test_llsdmessage_peer.py
+++ b/indra/llmessage/tests/test_llsdmessage_peer.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 """\
 @file   test_llsdmessage_peer.py
 @author Nat Goodspeed
@@ -31,7 +31,7 @@ $/LicenseInfo$
 
 import os
 import sys
-from BaseHTTPServer import HTTPServer, BaseHTTPRequestHandler
+from http.server import HTTPServer, BaseHTTPRequestHandler
 
 from llbase.fastest_elementtree import parse as xml_parse
 from llbase import llsd
@@ -165,7 +165,7 @@ if __name__ == "__main__":
         # "Then there's Windows"
         # Instantiate a Server(TestHTTPRequestHandler) on the first free port
         # in the specified port range.
-        httpd, port = freeport(xrange(8000, 8020), make_server)
+        httpd, port = freeport(range(8000, 8020), make_server)
 
     # Pass the selected port number to the subject test program via the
     # environment. We don't want to impose requirements on the test program's