How to import python package with sdk

I followed the instructions here (https://www.mathworks.com/help/compiler_sdk/ml_code/create-a-python-application-with-matlab-code.html) and successfully created a python package. While I can import the package, when I try to initialize it I get an error saying Pkg.initialize() does not exist. I'm also not sure it installed correctly. When I ran sudo python setup.py install (w/o sudo i get a permissions error) I get the following output.

"running install

running build

running build_py

running install_lib

running install_egg_info

Removing /Library/Python/2.7/site-packages/matlabruntimeforpython-R2017b-py2.7.egg-info

Writing /Library/Python/2.7/site-packages/matlabruntimeforpython-R2017b-py2.7.egg-info

removing 'build/lib' (and everything under it)

'build/bdist.macosx-10.12-intel' does not exist -- can't clean it

'build/scripts-2.7' does not exist -- can't clean it

removing 'build'"

[Kojiro Saito]

When you compiled, did you specify the library name as Pkg?

[Mark Higger]

It was "ParResPkg" with a function called ParRes inside, when I called it, i called "import ParResPkg" then calleed "ParResPkg.initialize()" the weird thing is that it found "ParResPkg" but it was memberless.

[Kojiro Saito]

What's you Python codes for calling compiled package? I have tried the document's steps and works without an error.

[Mark Higger]

" import ParResPkg

ParResPkg.initialize() "

and I am getting the error

File "/Users/markhigger/Documents/MATLAB/TestPkg.py", line 10, in <module>
  ParResPkg.initialize()

 AttributeError: module 'ParResPkg' has no attribute 'initialize'

Is it possible there is an error in the install? At the end of the install I get message:

 'build/bdist.macosx-10.12-intel' does not exist -- can't clean it

 'build/scripts-2.7' does not exist -- can't clean it

Answer 1

[Kojiro Saito]

I don't have Mac OS now, so I can't test module installation, but I have tested in Linux OS.

python ./setup.py install

displayed the following output.

running install
running build
running build_py
creating build
creating build/lib.linux-x86_64-2.7
creating build/lib.linux-x86_64-2.7/MagicSquarePkg
copying MagicSquarePkg/__init__.py -> build/lib.linux-x86_64-2.7/MagicSquarePkg
copying MagicSquarePkg/MagicSquarePkg.ctf -> build/lib.linux-x86_64-2.7/MagicSquarePkg
running install_lib
running install_egg_info
Removing /usr/local/lib/python2.7/dist-packages/matlabruntimeforpython-R2018a.egg-info
Writing /usr/local/lib/python2.7/dist-packages/matlabruntimeforpython-R2018a.egg-info
removing 'build/lib.linux-x86_64-2.7' (and everything under it)
'build/bdist.linux-x86_64' does not exist -- can't clean it
'build/scripts-2.7' does not exist -- can't clean it
removing 'build'

I have a concern that in your case, there's no "creating" and "copying" descriptions, so I guess your module was not installed properly.

Could you clean-up the module first,

python ./setup.py clean

and reinstall it again?

python ./setup.py install

[Mark Higger]

I tried that, and its still not working?

[Mark Higger]

I attached a few screenshots of the package creation, the python code/error, the folder containing everything and the output of python setup install

[Kojiro Saito]

Two things I want to confirm.

(1) Is there any MagicSqrPkg.py file in your current direcotry? It would cause module conflict.

(2) Does this 'no attribute initialize' error occur in Python command line (call 'python TestPkg.py' in Terminal, not via iPython)? As this document says, rather than python commands, we need to use mwpython command, so, matlabroot/bin/mwpython ./TestPkg.py is a correct command.

Answer 2

[Joseph Ziminski]

I had the same problem, not sure if this solution would work for you but what (at least has initially) seemed to fix it:

Finding package at 'C:\Users\Owner\Anaconda3\envs\RealptoMatlab\Lib\site-packages\magSq' there is a 'magic_square' folder (my mat file was 'magic_square.m', I set the namespace to 'magSq' when compiling), '_pycache_' and '__init__.py'. However the files contained in other working modules are all found only in the 'magic_square' folder, including a .ctf file. As such in the ..\magSq folder I deleted '_pycache_' and '__init__.py'. Then I copied the contents of 'magic_square' (which also includes a _pycache _ and the init file) into the magSq folder and deleted the empty 'magic_square' folder. Then it seems to find .initilise() etc.

Not sure why this happened, the only difference between this and other working modules is that I compiled it with a namespace, but feels unlikely that is the cause.

UPDATE: to finally get it working I had to change the file name of 'magic_square.ctf' to 'magSq.ctf' and it worked.