On Tuesday, April 5, 2016 at 2:17:24 AM UTC+5:30, Terry Reedy wrote: > On 4/4/2016 11:31 AM, 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' > > > > > > of course > > > >>>> import tkinter.ttk as ttk > > > > works > > > > Strange, isn't it ? > > Nope. As other said, 'import tkinter as tk' imports a module named > 'tkinter' and *in the importing modules, and only in the importing > module*, binds the module to 'tk'. It also caches the module in > sys.modules under its real name, 'tkinter'. > > >>> import tkinter as tk > >>> import sys > >>> 'tkinter' in sys.modules > True > >>> 'tk' in sys.modules > False > > '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 :-) -- https://mail.python.org/mailman/listinfo/python-list
