Path: csiph.com!eternal-september.org!feeder.eternal-september.org!mx02.eternal-september.org!.POSTED!not-for-mail
From: Jussi Piitulainen <jussi.piitulainen@helsinki.fi>
Newsgroups: comp.lang.python
Subject: Re: subscripting Python 3 dicts/getting the only value in a Python 3 dict
Date: Tue, 12 Jan 2016 22:18:03 +0200
Organization: A noiseless patient Spider
Lines: 24
Message-ID: <lf537u2tuv8.fsf@ling.helsinki.fi>
References: <f2711b57-7b11-4fd5-8bab-a3e8581177b5@googlegroups.com> <lf5a8oaellh.fsf@ling.helsinki.fi> <87egdmd1ou.fsf@elektro.pacujo.net>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Injection-Info: mx02.eternal-september.org; posting-host="305c68510616a2e7ac08bcd2ff1598bd"; logging-data="31084"; mail-complaints-to="abuse@eternal-september.org";	posting-account="U2FsdGVkX1+6ZNOep1x1SHkIYucCvSmj5SmFI28Rn+0="
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.1 (gnu/linux)
Cancel-Lock: sha1:xglBBUq0pyAMjkxem32ZuOwTqo4= sha1:Os4FM2WTrHl3pLfDVmbXJkRSrpg=
Xref: csiph.com comp.lang.python:101573

Marko Rauhamaa writes:

> Jussi Piitulainen:
>
>> But the most readable thing might be to have a function that extracts
>> the sole value by whatever means:
>>
>>    >>> def sole(d): [o] = d.values() ; return o
>>    ... 
>>    >>> sole(shoe)
>>    3.141592653589793
>
> In the same vein:
>
>    >>> def sole(d):
>    ...   for o in d.values():
>    ...     return o
>    ... 
>    >>> sole(shoe)
>    3.141592653589793

Tuple assignment has a useful side effect that all other methods present
in this thread lack: it raises an exception if the number of dictionary
entries is not exactly one.