Fergal Daly added the comment:
Even if the glossary pointed to collections.html, there are far more methods specified there than are needed to be **able.
The code just calls into the same code as dict.update(dict) (although
.update can also work on a sequence of twouples).
dict.update's doc string is explicit about what it requires from the argument:
| update(...)
| D.update(E, **F) -> None. Update D from dict/iterable E and F.
| If E has a .keys() method, does: for k in E: D[k] = E[k]
| If E lacks .keys() method, does: for (k, v) in E: D[k] = v
| In either case, this is followed by: for k in F: D[k] = F[k]
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Python tracker
http://bugs.python.org/issue10357
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