[Python-Dev] Re: PEP proposal to limit various aspects of a Python program to one million.

5 Dec 2019


      On 05/12/2019 12:45 pm, Karthikeyan wrote:
...
On Thu, Dec 5, 2019, 5:53 PM Mark Shannon <mark@hotpy.org 
<mailto:mark@hotpy.org>> wrote:
On 04/12/2019 2:31 am, Gregory P. Smith wrote:
     >
     >
     > On Tue, Dec 3, 2019 at 8:21 AM Mark Shannon <mark@hotpy.org
    <mailto:mark@hotpy.org>
     > <mailto:mark@hotpy.org <mailto:mark@hotpy.org>>> wrote:
     >
     >     Hi Everyone,
     >
     >     I am proposing a new PEP, still in draft form, to impose a
    limit of one
     >     million on various aspects of Python programs, such as the
    lines of
     >     code
     >     per module.
     >
     >     Any thoughts or feedback?
     >
[snip]
>
     >
     > Overall I /like/ the idea of limits... /But.../ in my experience,
    limits
     > like this tend to impact generated source code or generated
    bytecode,
     > and thus any program that transitively uses those.
     >
     > Hard limits within the Javaish world have been *a major pain* on the
     > Android platform for example.  I wouldn't call workarounds
     > straightforward when it comes to total number of classes or
    methods in a
     > process.
Do you have any numbers? 1M is a lot bigger then 64K, but real world
    numbers would be helpful.
I guess the relevant case in question is with Facebook patching the 
limit of 65,000 classes in Android : 
https://m.facebook.com/notes/facebook-engineering/under-the-hood-dalvik-patc...
Is that the correct link? That seems to be an issue with an internal 
buffer size, not the limit on the number of classes.
...
>
     > If we're to adopt limits where there were previously none, we
    need to do
     > it via a multi-release deprecation cycle feedback loop to give
    people a
     > way to find report use cases that exceed the limits in real world
     > practical applications.  So the limits can be reconsidered or the
     > recommended workarounds tested and agreed upon.
     >
     > -gps
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