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

[Eric V. Smith]

Eric V. Smith <eric at trueblade.com> added the comment:

Serhiy: I'm not sure what you're saying. At the point that str.format() is producing its error message, it doesn't know as much as %-formatting does about the original arguments, so it can't produce a similar message.

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<http://bugs.python.org/issue13790>
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