Add a utility function for chaining nested setdefault calls.

Review Request #5122 — Created Dec. 16, 2013 and submitted — Latest diff uploaded

Information

Django Evolution
master

Reviewers

Add a utility function for chaining nested setdefault calls.

Several parts of the diff code built deeply nested dictionaries through
awkwardly formatted setdefault calls. This was hard to make both
PEP-8-compliant and readable, and wasn't the nicest way of going about
it.

This introduces a new utility function that takes variable arguments of
keys, and builds out the nested dictionaries. It then sets the last to
be a list, as needed by the diff code for the property storage.

Unit tests pass.

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