Efficiency/style issues of import <module> vs. from <module> import <name>, ...

[Ethan Furman]

Stephen Hansen wrote:
> On 6/17/10 10:01 AM, Ethan Furman wrote:
>> Stephen Hansen wrote:
>>> On 6/17/10 9:12 AM, python at bdurham.com wrote:
>>>
>>> Now, this is all IMHO: the style guide does not define any 'guidelines'
>>> on this, except that its okay to use "from ... import ..." to pull in
>>> classes and (implicitly) constants, and despite how the rules say 'one
>>> module per line' its OK to pull in more then one name -from- a module at
>>> once.
>> What do you mean by "(implicitly) constants"?
> 
> Quote, PEP-8:
> 
>  - Imports should usually be on separate lines, e.g.:
> 
>         Yes: import os
>              import sys
> 
>         No:  import sys, os
> 
>       it's okay to say this though:
> 
>         from subprocess import Popen, PIPE
> 
> It explicitly states later its entirely OK to import classes. It never
> says anything else directly, except in the example given, it shows you
> importing a constant. So, its giving implicit approval to that without
> really directly saying anything about it.


Thanks for the clarification -- I was reading it as constants being 
implicitly imported, and I knew that wasn't so!  ;)

~Ethan~