importing
Tim Golden
mail at timgolden.me.uk
Mon Mar 7 10:59:57 EST 2016
On 07/03/2016 15:54, Tony van der Hoff wrote:
> I thought I understood this, but apparently not:
> Under py3:
>
> 1. "import tkinter" imports the whole module into the name space. Any
> access to names therein must be prefixed with the module name.
> ie top = tkinter.Tk()
> But tkinter.messagebox.showwarning() errors with "module has no
> attribute 'messagebox'"
>
> 2. "from tkinter import *" loads the name space from the module into the
> program name space. No need to prefix the module name onto the attribute
> name. Pollutes the name space, but makes typing easier.
> ie top = Tk()
> But messagebox.showwarning() still errors.
>
> 3. in either of the above cases, if I add "from tkinter import
> messagebox, the attribute resolves correctly.
>
> I imagined that the "*" form implied "load the lot". Evidently, my
> understanding is lacking. Will somebody please put me straight, or give
> me a reference to some definitive documentation?
>
What you're seeing is that "messagebox" is a module inside the "tkinter"
package. And modules are not automatically made available under their
parent packages.
That is: a module's attributes are part of its namespace; but a
package's modules aren't part of its.
TJG
More information about the Python-list
mailing list