Cf. https://martinfowler.com/bliki/CommandQuerySeparation.html
But: >>> l = [1,2,3] >>> l.pop() 3 >>> l [1, 2] => Not so true. S. On Wed, Mar 1, 2017 at 11:10 AM, Stephan Houben <stephan...@gmail.com> wrote: > It's even in the Programming FAQ: > > "In general in Python (and in all cases in the standard library) a method > that mutates an object will return None to help avoid getting the two > types of operations confused. So if you mistakenly write y.sort() thinking > it will give you a sorted copy of y, you’ll instead end up with None, > which will likely cause your program to generate an easily diagnosed error." > > Stephan > > 2017-03-01 10:31 GMT+01:00 Paul Moore <p.f.mo...@gmail.com>: > >> On 1 March 2017 at 01:31, qhlonline <qhlonl...@163.com> wrote: >> > My code example is not proper, Yes, may be this is better: >> > list.sort().revers( >> >> We can already do this - reversed(sorted(lst)) >> >> This is a long-established design decision in Python. It would need a >> *very* compelling use case to even think about changing it. >> Paul >> _______________________________________________ >> Python-ideas mailing list >> Python-ideas@python.org >> https://mail.python.org/mailman/listinfo/python-ideas >> Code of Conduct: http://python.org/psf/codeofconduct/ >> > > > _______________________________________________ > Python-ideas mailing list > Python-ideas@python.org > https://mail.python.org/mailman/listinfo/python-ideas > Code of Conduct: http://python.org/psf/codeofconduct/ > -- Stefane Fermigier - http://fermigier.com/ - http://twitter.com/sfermigier - http://linkedin.com/in/sfermigier Founder & CEO, Abilian - Enterprise Social Software - http://www.abilian.com/ Chairman, Free&OSS Group / Systematic Cluster - http://www.gt-logiciel-libre.org/ Co-Chairman, National Council for Free & Open Source Software (CNLL) - http://cnll.fr/ Founder & Organiser, PyData Paris - http://pydata.fr/ --- “You never change things by fighting the existing reality. To change something, build a new model that makes the existing model obsolete.” — R. Buckminster Fuller
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