Context

bson/son.py contains three methods that were added for Python 2 compatibility but are no longer needed:

• has_key(key) — Python 2's dict.has_key(), replaced by key in son
• iterkeys() — Python 2's dict.iterkeys(), replaced by iter(son)
• itervalues() — Python 2's dict.itervalues(), replaced by iter(son.values())

Definition of done

Since SON is a public class with documented API, these should be deprecated before removal:

1. Add warnings.warn(..., DeprecationWarning, stacklevel=2) to each method
2. In a later release, remove the methods and their test coverage in test/test_son.py

Pitfalls

N/A