Re: python-on-guile

[david larsson <david.larsson@selfhosted.xyz>]

On 2020-02-10 21:11, Stefan Israelsson Tampe wrote:
> I have now added the bytes constructor that was not working.

Thanks!

> 
> To compile from source please try use the git repository at:
> 
> https://gitlab.com/python-on-guile/python-on-guile/
> 
> see readme for how to compile and what dependencies you have.

I was able to build and install:
   - guile-persist: commit ebebb66ae6d6c47dbc406cdbcaccb5ffed2e463a
   - stis-parser: commit 7673dd576abb445fbcfce8c4b6ae961ee860902e

but for python-on-guile Im getting this error on make:

--------------

Makefile:1390: warning: overriding recipe for target 'python'
Makefile:771: warning: ignoring old recipe for target 'python'
   GEN      language/python/guilemod.go
guile: warning: failed to install locale
warning: failed to install locale: Invalid argument
ice-9/boot-9.scm:752:25: In procedure dispatch-exception:
Syntax error:
language/python/guilemod.scm:271:0: cond-expand: unfulfilled cond-expand 
in form (cond-expand (guile-3.0 (define-set-M lookup-warning-type 
lookup-warning-type) (define-set-M warning warning) (set! %warning-types 
w-types)) (guile-2.0 or guile-2.2 (define-M %warning-types w-types) 
(define-exp-M lookup-warning-type (lambda (name) "Return the warning 
type NAME or `#f' if not found." ((M find) (lambda (wt) (eq? name ((M 
warning-type-name) wt))) (M %warning-types))))))
make: *** [Makefile:1385: language/python/guilemod.go] Error 1

---------------

Im compiling with guile2.2

Regards,
David

> 
> Regards
> Stefan
> 
> On Mon, Feb 10, 2020 at 1:14 PM david larsson
> <david.larsson@selfhosted.xyz> wrote:
> 
>> On 2020-02-09 21:36, Stefan Israelsson Tampe wrote:
>>> in sys that is
>>> 
>>> On Sun, Feb 9, 2020 at 9:36 PM Stefan Israelsson Tampe
>>> <stefan.itampe@gmail.com> wrote:
>>> 
>>>> OKey, I changed the values from immutable lists to lists.
>>>> 
>> 
>> Great!
>> 
>>>> On Sun, Feb 9, 2020 at 9:27 PM Stefan Israelsson Tampe
>>>> <stefan.itampe@gmail.com> wrote:
>>>> 
>>>> Note that a lot of things are untested because I'm alone on the
>>>> development.
>> 
>> Ok, I understand.
>> 
>> I haven't been able to build a recent version, but if you can share
>> some
>> updated instructions, then I could perhaps help out with some
>> occasional
>> testing. I have only managed to build from the old commit fc0d7a9 by
>> 
>> updating the current python-on-guile guix package locally.
>> 
>>>> 
>>>> netlib is not included, you can test to add the python module
>> file
>>>> to a (language python module) directory
>> 
>> What's been working for me so far is only (load "path/to/file.py")
>> and
>> (load-compiled "path/to/file.go").
>> 
>> (use-modules (a b c)) did not work for me, except to load modules
>> already shipped with python-on-guile repo; (language python module
>> python) etc.
>> 
>>>> 
>>>> I have recently added much more of the python stdlib aka 3.7 but
>> not
>>>> all.
>>>> 
>>>> Not sure what you mean by .scm file and .py fle when it comes to
>>>> base64
>>>> using that module in scheme gives
>>>> scheme@(guile-user)> (b64decode (b64encode "abc"))
>>>> $2 = b'abc'
>>>> scheme@(guile-user)> (b64decode (b64encode #(1 2 3)))
>>>> $3 = b'\x01\x02\x03'
>>>> 
>>>> Which return a bytevector if you want a string back you need to
>>>> interpret the bytevector back to a string
>> 
>> Im getting weird results when trying to output the base64
>> representation
>> of a string, take btest.py:
>> #import sys
>> import base64
>> def mybmethod(x):
>> mybytes = bytes(x, "utf-8")
>> encodedbytes = base64.b64encode(mybytes)
>> myb64string = str(encodedbytes, "utf-8")
>> return myb64string
>> #print(myb64string)
>> #mybmethod(sys.argv[1])
>> 
>> and assume btest.scm using it with:
>> (add-to-load-path (dirname (current-filename)))
>> (use-modules (language python module python))
>> (load "btest.py")
>> (define-public (mybmethodscm cmdline)
>> (display (mybmethod (cadr cmdline))))
>> 
>> With this it will not work to run the scheme file with
>> guile -e mybmethodscm btest.scm dfasdf
>> 
>> The error I got indicated that btest.py uses the bytes procedure
>> from
>> within python-on-guile instead of from the python3 base64 lib:
>> 
>> -------------------
>> 
>> In
>> 
> /home/user1/VirtualHome/src/code_guile/python-on-guile-test/btest.scm:
>> 18:11  4 (mybmethodscm _)
>> In btest.py:
>> 10:584  3 (_ "dfasdf" . _)
>> In oop/pf-objects.scm:
>> 584:15  2 (create-object _ _)
>> 567:11  1 (the-create-object _ _)
>> In language/python/bytes.scm:
>> 99:6  0 Exception thrown while printing backtrace:
>> Unbound slot in object Error while printing exception.
>> 
>> language/python/bytes.scm:99:6: Wrong number of arguments to
>> #<procedure
>> 7f2bab5d4560 at language/python/bytes.scm:92:0 (self) | (self s)>
>> 
>> -------------------
>> 
>> For a moment though, I could run:
>> 
>> guile -e mybmethodscm btest.scm dfasdf | rev | base64 -d | rev
>> # gives: dfasdf
>> 
>> which was also strange.
>> 
>>>> 
>>>> modules are a bit difficult as I use the guile module system and
>> the
>>>> python modules are different.
>>>> So nested modules needs some work. The best is to test and see.
>> 
>> Ok, got it!
>> 
>>>> 
>>>> I will look into the sys thingies
>>>> 
>>>> Regards
>>>> Stefan
>>>> 
>>>> On Sun, Feb 9, 2020 at 8:40 PM david larsson
>>>> <david.larsson@selfhosted.xyz> wrote:
>>>> Thanks for your explanations, but unfortunately I still can't
>> figure
>>>> out
>>>> how to use this except in the simplest of cases.
>>>> 
>>>> I am using the guix package python-on-guile 0.1.0-3.00a51a2 -
>> maybe
>>>> thats outdated?
>>>> 
>>>> The simple things I have managed to do, are like:
>>>> 
>>>> (add-to-load-path (dirname (current-filename)))
>>>> (load-compiled python-test.go)
>>>> 
>>>> where python-test.go is compiled with:
>>>> 
>>>> guild compile python-test.py --output=python-test.go
>>>> --from=python
>>>> 
>>>> and contains simple things, like:
>>>> 
>>>> f(s):
>>>> a = s + 1
>>>> return a
>>>> 
>>>> but if I add statements to python-test.py like:
>>>> 
>>>> import netaddr
>>>> def myfun(a)
>>>> <something using netaddr>
>>>> 
>>>> (netaddr is a module installed via: pip3 install --user netaddr)
>>>> 
>>>> I receive an error about not finding the module.
>>>> 
>>>> I am able to add only the modules which exist in the
>> python-on-guile
>>>> 
>>>> repo, like:
>>>> 
>>>> import sys
>>>> import base64
>>>> 
>>>> but Im getting errors, for example Im not able to use things from
>>>> sys,
>>>> like:
>>>> 
>>>> sys.path.append(<somepath>)
>>>> sys.path.insert(0, <somepath>)
>>>> 
>>>> I was able to use some things from base64 but I only received
>> weird
>>>> results when converting between bytevectors and strings between
>> the
>>>> .scm
>>>> file and .py file. What works fine using python3 python-test.py
>> do
>>>> not
>>>> usually work when passing either a bytevector or string to the
>> same
>>>> go-compiled file from the .scm file using the python-code. Not
>> sure
>>>> whether there's a problem using python3 vs python2 here?
>>>> 
>>>> Essentially, what Im looking for is how to proceed if I want to
>> use
>>>> modules installed via the pip package manager from guile, and
>> what
>>>> paths
>>>> and imports I need to make, and how I might need to wrap them
>>>> correctly
>>>> in the scheme and python files to invoke a pip package procedure
>>>> from
>>>> guile.
>>>> 
>>>> Best regards,
>>>> David
>>>> 
>>>> On 2020-02-09 18:59, Stefan Israelsson Tampe wrote:
>>>>> I'm the author of that lib.
>>>>> 
>>>>> 1)
>>>>> 
>>>>> The main bindings are reachable through (language python module
>>>>> python)
>>>>> 
>>>>> So you could now go ahead and do
>>>>>> (use-modules (language python module python))
>>>>>> ;L python
>>>>> 
>>>>> And you will get a python shell that works quite ok for one
>> liners
>>>>> 
>>>>> 2)
>>>>> 
>>>>> If you write a module and place it in a/b/c.py
>>>>> you can use the classes and functions theirin by
>>>>> 
>>>>> (use-modules (a b c))
>>>>> 
>>>>> 3)
>>>>> you can load a .py file as (i hope this work)
>>>>> (load "a.py")
>>>>> 
>>>>> 4)
>>>>> If you place a module in (language python module a.py) you can
>>>> import
>>>>> ir as a usual mode as
>>>>>> from a import *
>>>>> 
>>>>> The documentation is for the macro framework that enables you to
>>>> work
>>>>> with python classes and idioms like python iteration.
>>>>> 
>>>>> Hope this helps
>>>>> /Stefan
>>>>> 
>>>>> On Sun, Feb 9, 2020 at 6:31 PM david larsson
>>>>> <david.larsson@selfhosted.xyz> wrote:
>>>>> 
>>>>>> Hi everyone,
>>>>>> I am trying to wrap my head around how to use the
>> python-on-guile
>>>>>> library, but Im struggling. Does anyone have example code that
>>>> might
>>>>>> 
>>>>>> help, and which isn't too advanced?
>>>>>> 
>>>>>> All tips and suggestions appreciated!
>>>>>> 
>>>>>> Best regards,
>>>>>> David