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Groups > comp.lang.python > #33146

Re: List comprehension for testing **params

Date 2012-11-11 16:49 -0600
From Tim Chase <python.list@tim.thechases.com>
Subject Re: List comprehension for testing **params
References <50a0258f$0$21241$ba4acef3@reader.news.orange.fr>
Newsgroups comp.lang.python
Message-ID <mailman.3564.1352675058.27098.python-list@python.org> (permalink)

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> assert[key for key in required if key in params.keys()]
...
> Could you explain why it doesn't work and do you have any idea of how it 
> could work ?

Well, here, if any of the items are found, you get a list that is
non-False'ish, so the assert passes.

It sounds like you want all() (available as of 2.5)

  assert all(key in params for key in required)

This is modulo any key normalization for "From" vs. "FROM" vs.
"from", etc; but should be enough to pass your initial requirements.

-tkc

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Thread

List comprehension for testing **params Cantabile <cantabile.03@wanadoo.fr> - 2012-11-11 23:24 +0100
  Re: List comprehension for testing **params Ian Kelly <ian.g.kelly@gmail.com> - 2012-11-11 15:56 -0700
  Re: List comprehension for testing **params Tim Chase <python.list@tim.thechases.com> - 2012-11-11 16:49 -0600
  Re: List comprehension for testing **params Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-11-11 23:18 +0000
    Re: List comprehension for testing **params Tim Chase <python.list@tim.thechases.com> - 2012-11-11 18:21 -0600
      Re: List comprehension for testing **params Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-11-12 07:32 +0000
  Re: List comprehension for testing **params Terry Reedy <tjreedy@udel.edu> - 2012-11-11 18:37 -0500
    Re: List comprehension for testing **params Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-11-11 23:41 +0000
  Re: List comprehension for testing **params Cantabile <cantabile.03@wanadoo.fr> - 2012-11-12 00:53 +0100
  Re: List comprehension for testing **params Ulrich Eckhardt <ulrich.eckhardt@dominolaser.com> - 2012-11-12 11:48 +0100
    Re: List comprehension for testing **params Cantabile <cantabile.03@wanadoo.fr> - 2012-11-12 23:25 +0100

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