On Thu, 26 Mar 2015 08:47 pm, Ivan Evstegneev wrote:
>
>
>> -----Original Message-----
>> From: Python-list [mailto:python-list-
>> bounces+webmailgroups=gmail....@python.org] On Behalf Of Steven
>> D'Aprano
>> Sent: Thursday, March 26, 2015 01:49
>> To: python-list@python.org
>> Subject: Re: Function Defaults - avoiding unneccerary combinations of
>> arguments at input
>>
>> On Thu, 26 Mar 2015 04:43 am, Ivan Evstegneev wrote:
>>
>> > Hello all ,
>> >
>> >
>> > Just a little question about function's default arguments.
>> >
>> > Let's say I have this function:
>> >
>> > def my_fun(history=False, built=False, current=False, topo=None,
>> > full=False, file=None):
>> > if currnet and full:
>> > do something_1
>> > elif current and file:
>> > do something_2
>> > elif history and full and file:
>> > do something_3
[...]
> As I said in a previous mail, main purpose of this arguments is to define
> what path should be chose. It is actually one xls file that could be
> placed into various placed within my folder tree.
>
> For instance, I have following folder tree:
>
> data_lib/
> current/
> history/
> built/
>
> Say I have "test.xls" that could be in one of those three folders.
> I wrote a function that reads it out, and its input arguments just define
> where it should be read. So all those "ifs" related to path definition.
Perhaps something like this?
def my_func(subdir):
if subdir not in ("current", "history", "built"):
raise ValueError("invalid sub-directory")
# Better to use os.path.join, but I'm feeling lazy.
path = "path/to/data_lib/" + subdir + "/test.xls"
process(path)
--
Steven
--
https://mail.python.org/mailman/listinfo/python-list
