Re: module alias in import statement

Newsgroups	comp.lang.python
Date	2016-04-04 21:27 -0700
References	(1 earlier) <ndujs3$7n6$1@ger.gmane.org> <mailman.38.1459802831.32530.python-list@python.org> <47c51cb5-2d4b-42d3-8bf2-268720ebb4d2@googlegroups.com> <CAPTjJmrskhvZBo5jbiDu4HGpp+YQ2u3sBj-ZFp3KcMv9e5LHyA@mail.gmail.com> <mailman.52.1459830198.32530.python-list@python.org>
Message-ID	<b707ce3a-6e9e-45dd-9f4d-2cc6c8d197a6@googlegroups.com> (permalink)
Subject	Re: module alias in import statement
From	Rustom Mody <rustompmody@gmail.com>

Show all headers | View raw

On Tuesday, April 5, 2016 at 9:53:30 AM UTC+5:30, Chris Angelico wrote:
> On Tue, Apr 5, 2016 at 2:08 PM, Rustom Mody  wrote:
> >> 'import tk.ttk' looks for 'tk' in sys.modules, does not find it, looks
> >> for a module named 'tk' on disk, does not find it, and says so.
> >
> > A well-known quote comes to mind:
> >
> > | There are only two hard things in Computer Science: cache invalidation and
> > | naming things.
> >
> > eg. http://martinfowler.com/bliki/TwoHardThings.html
> >
> > particularly since this seems to be in both categories :-)
> 
> sys.modules isn't really a cache in that sense, though. The "hard
> problem" of cache invalidation comes from the fundamental assumption
> that a cache hit should be semantically identical to a cache miss;

Following looks like a cache miss to me (certainly did to the OP):

On Monday, April 4, 2016 at 9:01:41 PM UTC+5:30, ast wrote:
> hello
> 
> >>> import tkinter as tk
> >>> import tk.ttk as ttk
> 
> Traceback (most recent call last):
>   File "<pyshell#3>", line 1, in <module>
>     import tk.ttk as ttk
> ImportError: No module named 'tk'
>

Thread

module alias in import statement "ast" <nomail@com.invalid> - 2016-04-04 17:31 +0200
  Re: module alias in import statement Ned Batchelder <ned@nedbatchelder.com> - 2016-04-04 08:59 -0700
  Re: module alias in import statement Steven D'Aprano <steve@pearwood.info> - 2016-04-05 02:15 +1000
  Re: module alias in import statement Terry Reedy <tjreedy@udel.edu> - 2016-04-04 16:46 -0400
    Re: module alias in import statement Rustom Mody <rustompmody@gmail.com> - 2016-04-04 21:08 -0700
      Re: module alias in import statement Chris Angelico <rosuav@gmail.com> - 2016-04-05 14:23 +1000
        Re: module alias in import statement Rustom Mody <rustompmody@gmail.com> - 2016-04-04 21:27 -0700
          Re: module alias in import statement Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2016-04-05 17:26 +1000
            Re: module alias in import statement Chris Angelico <rosuav@gmail.com> - 2016-04-05 17:47 +1000

csiph-web