Emanuel Barry added the comment:
The behaviour is correct, it's your assumptions that aren't :)
The code for str.format only checks for what's before the colon (here, "HGNC")
and checks if that's part of the dict provided. It isn't, so it raises a
KeyError. It doesn't even get to the format spec part (which is a perfectly
valid format specifier). Your dict can contain anything or be empty, str.format
only checks for the existence of the key you asked for ("HGNC"). "{HGNC:11892}"
is also a perfectly valid Python string.
P.S.: While I'm fine with people calling me by my last name, there's another
developer whose name is Barry Warsaw, so let's try to avoid confusion here ;-)
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue27160>
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