[Python-Dev] PEP 435 -- Adding an Enum type to the Python standard library (original) (raw)

Glenn Linderman v+python at g.nevcal.com
Fri Apr 26 04:09:14 CEST 2013

On 4/25/2013 4:53 PM, Ethan Furman wrote:

On 04/25/2013 04:26 PM, Glenn Linderman wrote:

My question is, once an enumeration is defined, is there a way, short of element-by-element assignment, to import the individual enumeration instances into the current namespace, so that I can say "red" instead of "Color.red" ? I understand the benefits of avoiding name collisions when there are lots of enumerations, and lots of opportunities for name collections between, say, RGBColor and CYMKColor... but there are lots of uses for enumerations where the subsidiary namespace is just aggravating noise. You mean something like: --> class Color(Enum): ... RED = 1 ... GREEN = 2 ... BLUE = 3 --> Color.register() # puts Color in sys.modules --> from Color import * # doesn't work in a function, though :( --> BLUE Color.BLUE

Something like that, but that works in a function too :)

Yeah, that would be nice. ;) A bit dangerous, though -- what if another module does the same thing, but its Color is different?

Better would be: --> Color.export(globals()) # put the enumerators in globals --> RED Color.RED

Globals? locals should be possible too.

Or even something like:

with Color: BLUE RED

Although the extra indentation could also be annoying.

One wouldn't want the module defining Color to automatically 'export' the colors: but rather a way to request an 'export' them into a particular scope. That way the proliferation of names into scopes is chosen by the programmer.

import module_containing_color module_containing_color.Color.export_enumerations( globals )

or

import module_containing_color module_containing_color.Color.export_enumerations( locals )

Or maybe locals is implicit, and in the file scope of a module, locals are globals anyway, so doing

module_containing_color.Color.export_enumerations()

would make the enumerations available to all definitions in the file, but inside a class or def doing the same thing would make the names direct members of the class or locals in the function. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.python.org/pipermail/python-dev/attachments/20130425/18a5b562/attachment.html>

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