PyWart: "Python's import statement and the history of external dependencies"
wuwei23 at gmail.com
Fri Nov 21 01:14:04 CET 2014
On 16/11/2014 3:01 PM, Rick Johnson wrote:
> Python's attempt to solve the "external dependencies problem"
> has yet to produce the results that many people, including
> myself, would like.
I'd say this was an argumentum ad populum, only you didn't cite anything
that shows the "many" you claim you speak for.
> Actually, Python is not alone in this deficiency, no, Python
> is just *ANOTHER* language in a *STRING* of languages over
> the years who has *YET AGAIN* implemented the same old
> crusty design patterns, packaged them in a shiny metallic
> wrapping paper with a big red bow on top, and hoped that no
> one would notice the stench...
Are you sure that's not just you?
> 1. Name clashes!
> 2. Smaller name pool!
Just off the top of my head, we have several solutions for this:
1) Rebinding imports
import foo as foo2
2) Namespace packages
3) Filepath imports (deprecated in 3.4 but under discussion for
reprecation or replacement)
loader = importlib.machinery.SourceFileLoader("module.name",
foo = loader.load_module()
4) Virtual environments
In before "but WHY so MANY different WAYS OMG PYTHON you M.F.P.O.S.":
because they offer flexibility.
> 3. Machinery is too implicit!
> 4. Circular imports are inevitable!
They're also clear indication of bad design. That's not something Python
should explicitly set out to support.
> 5. Much too difficult to use and/or explain!
Well sure, if your reaction to things you don't understand is to rant
against them instead of asking questions, then I can see how that would
Also: citation needed.
> 6. Too many "gotchas"!
Is this the sequel to "Too Many Cooks"? Awesome.
> In closing, there is only one thing you need to know about
> Python's import statement: it is deceptively easy to
> underestimate it's ability to *EFF UP* your expectations!
There's your problem right there: a language conforms to its
specification, not your random expectation.
I'm eager to see how you resolve your concerns in RickPython3000.
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