Packaging cleanup: normalize print calls.
Namely: use default arguments instead of explicit empty string; use multiple
arguments instead of building strings.
diff --git a/Lib/packaging/util.py b/Lib/packaging/util.py
index d4aae41..812dbe3 100644
--- a/Lib/packaging/util.py
+++ b/Lib/packaging/util.py
@@ -1099,7 +1099,7 @@
response = input(message)
response = response.strip().lower()
if response not in options:
- print('invalid response: %r' % response)
+ print('invalid response:', repr(response))
print('choose one of', ', '.join(repr(o) for o in options))
else:
return response