[Python-ideas] Dunder method to make object str-like
ethan at stoneleaf.us
Sun Apr 10 17:31:15 EDT 2016
On 04/10/2016 02:24 PM, Nikolaus Rath wrote:
> On Apr 09 2016, Nick Coghlan wrote:
>> The equivalent motivating use case here is "allow pathlib objects to
>> be used with the open() builtin, os module functions, and os.path
>> module functions".
> Why isn't this use case perfectly solved by:
> def open(obj, *a):
> # If pathlib isn't imported, we can't possibly receive
> # a Path object.
> pathlib = sys.modules.get('pathlib', None):
> if pathlib is not None and isinstance(obj, pathlib.Path):
> obj = str(obj)
> return real_open(obj, *a)
pathlib is the primary motivator, but there's no reason to shut everyone
By having a well-defined protocol and helper function we not only make
our own lives easier but we also make the lives of third-party libraries
and experimenters easier.
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