Paul, I understand what you say, except the part of compatibility with Python3.5. Of course such a change is targeting future version more than the current and previous versions. If we have this syntax for Python3.6, users of Python3.9 will find many copy-pastable answers written this way, and other answers will have comments saying "just add this statement to the beginning of your script".
On Mon, Sep 19, 2016 at 11:24 PM Paul Moore <p.f.mo...@gmail.com> wrote: > On 19 September 2016 at 19:52, אלעזר <elaz...@gmail.com> wrote: > > Of course it doesn't address the issues - for example, running a python > > script from the file manager will result in a failed execution, > unexplained. > > What you're talking about here is deployment of Python "applications" > (where in your case, you're focusing on single-file scripts, but the > problem is broader). Beyond a certain point, as I'm sure you realise, > you can't solve this issue - someone tries to run a Unix-only script > on Windows, for example. So really, we're looking at ways of improving > the current state of affairs. As things stand, deploying "standalone > applications" in Python is not particularly easy, with dependency > management being only one of the issues. > > Some options for deployment come to mind - I'm sure none of them seem > quite as easy as "just run this script", but you should remember that > even "just run this script" doesn't always work as well as you'd like > - on Unix you need to make the script executable and have a shebang > line, on Windows the file extension needs to be right and registered. > Not all users have the right (or sometimes any) Python version on > their PATH, etc. So even "just run this script" isn't always simple > even if the script has no dependencies outside the stdlib. > > So, some options: > > 1. The previously-mentioned rwt makes "just run this script" work as > you want, as long as you have rwt installed. Conceded, it isn't > available by default, but it's not hard to install as a one-off task. > And there's a discussion ongoing about including it with pip as "pip > run" so "pip run myscript.py" (or "py -m pip run myscript.py" on > Windows - remember what I said about PATH? ;-)) will run a script with > its dependencies. > 2. You can bundle your script with its dependencies using zipapp. On > Unix, you can even make the resulting file executable, and on Windows, > the .pyz extension is registered for this. > 3. Someone could write a tool to scan a script for a > specially-formatted comment at the top that described its > dependencies, and installed them. That (in effect) adds an "install" > step before the script can be run, but lots of utilities have that, so > it's not completely unheard of. And if it's GUI users you're concerned > about, you could make that a GUI utility. Drag the script onto it, it > lists the dependencies and confirms you want them installed, then > offers to run the script. > 4. There are existing platform-specific options like py2exe or > cx_Freeze. Probably a bit heavyweight for a "simple script", though. > > Of course, none of these options cover the use case of "I saw this > nice script on Stack Overflow, so I copied it, and now I want to run > it on my PC". But honestly, if it has some dependencies, and the > script author didn't say "you need to install FOO and BAR", or the > user doesn't know how to install those dependencies, you're probably > out of luck anyway. Even if the proposed "from __pypi__ import foo" > syntax existed, I doubt many scripts posted on the web would use it - > if only because then, Python 3.5 users wouldn't be able to run the > scripts! > > IMO, for command line use, rwt is 99% of the way to what you want. For > GUI use, there's nothing specific to this problem right now, but > someone could certainly write something. A syntax change to the > language would likely be *less* useful, as people would not be able to > use it unless they were deliberately only targeting Python 3.7 and > later, which seems optimistic at best... > > Paul >
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