Ben Wolfson <wolf...@gmail.com> added the comment:
And here is a patch for Greg Ewing's proposal:
http://mail.python.org/pipermail/python-dev/2011-June/111934.html
Again, decimal integers rather than any kind of integers are used.
Both patches alter the exceptions expected in various places in test_unicode's
test_format:
"{0.}".format() raises a ValueError (because the format string is invalid)
rather than an IndexError (because there is no argument)
"{0[}".format(), likewise.
"{0]}".format() raises a ValueError (because the format string is invalid)
rather than a KeyError (because "0]" is taken to be the name of a keyword
argument---meaning that the test suite was testing the actual behavior of the
implementation rather than the documented behavior).
"{c]}".format(), likewise.
In this patch, "{0[{1}]}".format('abcdef', 4) raises a ValueError rather than a
TypeError, because "{1}", being neither a decimalinteger nor an identifier,
invalidates the replacement field.
Both patches also add tests for constructions like this:
"{[0]}".format([3]) --> '3'
"{.__class__}".format(3) --> "<type 'int'>"
This conforms with the documentation (and current behavior), since in it
arg_name is defined to be optional, but it is not currently covered in
test_format, that I could tell, anyway.
----------
Added file:
http://bugs.python.org/file22599/strformat-just-identifiers-please.diff
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