STINNER Victor added the comment:

IMHO the error is very explicit:

Traceback (most recent call last):
  File "poc.py", line 6, in <module>
    print(a.format(**r))
KeyError: 'HGNC'

Your "r" directory has no "HGNC" key. I think that you misunderstood the 
formatting of str.format:
https://docs.python.org/dev/library/string.html#formatstrings

The format string "{HGNC:11892}" is parsed as key="HGNC", format="11892".

----------
nosy: +haypo

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<http://bugs.python.org/issue27160>
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