Chris Jerdonek added the comment:
> The code could simply use the str or repr of the choice object
It seems to me that this would result in less user-friendly behavior in many
cases. It would also require the end-user to understand Python (e.g. xrange
and dictionaries), which I don't think should be necessary for the user of a
command-line script.
For example, in Python 2.7 the containers xrange(5, 10), xrange(2, 10, 2), and
{1: "foo", 2: "bar"} currently yield the following user-friendly messages for
choice 0:
invalid choice: 0 (choose from 5, 6, 7, 8, 9)
invalid choice: 0 (choose from 2, 4, 6, 8)
invalid choice: 0 (choose from 1, 2)
With the proposed change, these messages would be as follows, which seem
unnecessarily obfuscated:
invalid choice: 0 (choose from xrange(5, 10))
invalid choice: 0 (choose from xrange(2, 10, 2))
invalid choice: 0 (choose from {1: 'foo', 2: 'bar'})
Thus, I think the proposal above would be a regression if applied. I think any
changes to maintenance releases should preserve the current user-friendly
messages (when those messages are user-friendly, e.g. when the containers are
small).
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<http://bugs.python.org/issue16418>
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