[issue13790] In str.format an incorrect error message for list, tuple, dict, set

[R. David Murray]

R. David Murray <rdmurray at bitdance.com> added the comment:

No, it wouldn't.  I expect

  "{}".format(x)

to produce something for an arbitrary x.  Breaking that would break a fundamental Python contract.

Improving the error message for 'd' is more possible.  Perhaps "the format code 'd' is not implemented by objects of type <type>"?

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nosy: +r.david.murray

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