MutableDict.setdefault doesn't return the new value

[Thomas Hervé]

MutableDict.setdefault was recently changed to properly propagate changes, but it broke the dictionary interface by not returning the value. You should be able to do that with a dict:

a = {} a.setdefault('b', 1) += 1

But with the current MutableDict behavior, it will fail with a NoneError.

[Thomas Hervé]

Opened https://bitbucket.org/zzzeek/sqlalchemy/pull-request/24 fixing the problem.

[Mike Bayer]

changelog, fixes #3093

→ <<cset 961ede05109e>>

[Mike Bayer]

changelog, fixes #3093

→ <<cset c8fe539ffb24>>

[Mike Bayer]

setdefault() was added in unreleased 0.8.7 in #3051 cf1ba8e101665231c527b so this has to be backported.

[Mike Bayer]

• backport #3093 to 0.8, fixes #3093

→ <<cset a7ed17e71437>>

[Mike Bayer]

• forwards-port changelog for ref #3093

→ <<cset 81f5631b4422>>

[Mike Bayer]

• forwards-port changelog for ref #3093

→ <<cset 889013529feb>>