Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:

The update() method returns None. This is a correct behavior.

The rationale is the same as for list.sort(), see 
https://docs.python.org/3/faq/design.html#why-doesn-t-list-sort-return-the-sorted-list.

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nosy: +serhiy.storchaka

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue32135>
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