with a non-empty format string. This is an effort to future-proof user
code. If a derived class does not currently implement __format__ but later
adds its own __format__, it would most likely break user code that had
- supplied a format string. This will be changed to a DeprecationWaring in
+ supplied a format string. This will be changed to a DeprecationWarning in
Python 3.3 and it will be an error in Python 3.4.
- Issue #8268: Old-style classes (not just instances) now support weak