diff options
Diffstat (limited to 'Lib/enum.py')
| -rw-r--r-- | Lib/enum.py | 34 |
1 files changed, 26 insertions, 8 deletions
diff --git a/Lib/enum.py b/Lib/enum.py index decb601..8d0982a 100644 --- a/Lib/enum.py +++ b/Lib/enum.py @@ -1205,21 +1205,39 @@ class Enum(metaclass=EnumType): def __init__(self, *args, **kwds): pass - def _generate_next_value_(name, start, count, last_values): + def _generate_next_value_(name, start, count, last_value): """ Generate the next value when not given. name: the name of the member start: the initial start value or None count: the number of existing members - last_value: the last value assigned or None + last_value: the list of values assigned """ - for last_value in reversed(last_values): - try: - return last_value + 1 - except TypeError: - pass - else: + if not last_value: + return start + try: + last = last_value[-1] + last_value.sort() + if last == last_value[-1]: + # no difference between old and new methods + return last + 1 + else: + # trigger old method (with warning) + raise TypeError + except TypeError: + import warnings + warnings.warn( + "In 3.13 the default `auto()`/`_generate_next_value_` will require all values to be sortable and support adding +1\n" + "and the value returned will be the largest value in the enum incremented by 1", + DeprecationWarning, + stacklevel=3, + ) + for v in last_value: + try: + return v + 1 + except TypeError: + pass return start @classmethod |