linux python3 virtualenv

[Nicky Perian]

I have errors and when I open python and manually import setuptools this happens.

>>> import io
>>> import os
>>> import sys
>>> import setuptools
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/nicky/WORKON_HOME/autobuild-2.0.0/lib/python3.9/site-packages/setuptools/__init__.py", line 18, in <module>
    from setuptools.dist import Distribution
  File "/home/nicky/WORKON_HOME/autobuild-2.0.0/lib/python3.9/site-packages/_virtualenv.py", line 89, in exec_module
    old(module)
  File "/home/nicky/WORKON_HOME/autobuild-2.0.0/lib/python3.9/site-packages/setuptools/dist.py", line 38, in <module>
    from setuptools import windows_support
  File "/home/nicky/WORKON_HOME/autobuild-2.0.0/lib/python3.9/site-packages/setuptools/windows_support.py", line 2, in <module>
    import ctypes
  File "/usr/local/lib/python3.9/ctypes/__init__.py", line 8, in <module>
    from _ctypes import Union, Structure, Array
ModuleNotFoundError: No module named '_ctypes'

Fairly sure I am missing something Cpython is on the system and in the path.

Need help.

[Monty Brandenberg]

On 8/18/2021 8:24 PM, Nicky Perian wrote:
> Fairly sure I am missing something Cpython is on the system and in the path.
>
> Need help.

_ctypes is provided by .so in a standard install. By the looks of
your stacktrace, you should see it in
/usr/local/lib/python3.9/lib-dynload/ as _ctypes.so and
_ctypes.cpython-39.so

Check if those are present. If not, you have an installation issue.
If present, you may have to dig a bit. Could be env vars sending
python to the wrong places.

[Coyot Linden (Glenn Glazer)]

You might need the python-dev package.

https://stackoverflow.com/questions/27022373/python3-importerror-no-module-named-ctypes-when-using-value-from-module-mul

Best,

coyot

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[Nicky Perian]

I have built libffi.so from source and built Python3.9.6 linked to libffi.so

>>> import setuptools
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>

  File "/home/nicky/lib/python3.9/site-packages/setuptools/__init__.py", line 20, in <module>
    from setuptools.dist import Distribution, Feature
  File "/home/nicky/lib/python3.9/site-packages/setuptools/dist.py", line 36, in <module>
    from setuptools import windows_support
  File "/home/nicky/lib/python3.9/site-packages/setuptools/windows_support.py", line 2, in <module>
    import ctypes
  File "/home/nicky/lib/python3.9/ctypes/__init__.py", line 8, in <module>

    from _ctypes import Union, Structure, Array

ImportError: libffi.so.7: cannot open shared object file: No such file or directory
>>>

Put libffi.so libfffi.so.7 Sym links to libffi.so.7.1.0 in ctypes and site-packages directories.

Is libffi.so.7 supposed to be a Sym link or the actual .so?

Where should the .so be placed to be visible to _ctypes? 

 

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[Nicky Perian]

Working now; moved libs to x86_64-linux-gnu.

[Nicky Perian]

https://bugs.python.org/issue14527#msg389390

I will try a rebuild with both. 

Looks like this should have been resolved upstream @ python.org long ago.

Thanks for pointing me in the right direction.

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