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From: Ben Finney <ben+python@benfinney.id.au>
Subject: Re: Rewriting to Python 3
Date: Fri, 01 May 2015 17:56:14 +1000
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Xref: csiph.com comp.lang.python:89707

Cecil Westerhof <Cecil@decebal.nl> writes:

> On my system I have:
>     PARSER_RE_STR = '/(%s)=' % '|'.join(DN_LUT.keys() + DN_LUT.values())
> in:
>     /usr/lib/python3.4/site-packages/ndg/httpsclient/ssl_peer_verification.py

Are you in contact with the author of that third-party library? Why is
it in your Python 3.4 site-packages?

> In Python 3 that gives:
>     TypeError: unsupported operand type(s) for +: 'dict_keys' and 'dict_values'
>
> How should I rewrite this?

My attempt:

    PARSER_RE_STR = "/({keys}|{values})=".format(
            keys=DN_LUT.keys(), values=DN_LUT.values())

Explicit is better than implicit, especially in mini-languages like
string interpolation.

-- 
 \      “Often, the surest way to convey misinformation is to tell the |
  `\               strict truth.” —Mark Twain, _Following the Equator_ |
_o__)                                                                  |
Ben Finney