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coin-or

Repository for organization-wide discussions and other organization documents.

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coin-or.github.io's Issues

Building with Visual Studio in MSys2: wrong version of link

I use a visual studio command prompt, instead of vcvarsall.bat to set up the environment .
Following the other instructions under the heading Building with Visual Studio in MSys2 on
https://coin-or.github.io/user_introduction.html#building-with-visual-studio-in-msys2
I get the following result (which shows the wrong version of link)

C:\Program Files (x86)\Microsoft Visual Studio\2019\Community>set PATH=C:\msys64\usr\bin;%PATH%
C:\Program Files (x86)\Microsoft Visual Studio\2019\Community>bash
Community>which link
/usr/bin/link
Community>

If I do the following, I get the correct version of link:

C:\Program Files (x86)\Microsoft Visual Studio\2019\Community>set PATH=%PATH%;C:\msys64\usr\bin
C:\Program Files (x86)\Microsoft Visual Studio\2019\Community>bash
Community>which link
/c/Program Files (x86)/Microsoft Visual Studio/2019/Community/VC/Tools/MSVC/14.29.30133/bin/HostX86/x86/link
Community>

cannot import name 'cydot' from partially initialized module 'cylp.cy.CyClpSimplex'

I cannot run example from this page: https://coin-or.github.io/CyLP/modules/CyCoinPackedMatrix.html.
OS: Win10
Python 3.9
cylp 0.92.1

More info below:

PS C:\...\>

Platform ServicePack Version      VersionString
-------- ----------- -------      -------------
 Win32NT             10.0.19044.0 Microsoft Windows NT 10.0.19044.0


PS C:\...\> python --version
Python 3.9.0
PS C:\...\> python
Python 3.9.0 (tags/v3.9.0:9cf6752, Oct  5 2020, 15:34:40) [MSC v.1927 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import cylp
>>> cylp.__version__
'0.92.1'
>>> import cylp.cy
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "c:\app\python39\lib\site-packages\cylp\cy\__init__.py", line 2, in <module>
    from .CyClpSimplex import CyClpSimplex
  File "cylp\\cy\\CyClpSimplex.pyx", line 1, in init cylp.cy.CyClpSimplex
  File "cylp\\cy\\CyClpPrimalColumnPivotBase.pyx", line 1, in init cylp.cy.CyClpPrimalColumnPivotBase
  File "cylp\\cy\\CyClpDualRowPivotBase.pyx", line 1, in init cylp.cy.CyClpDualRowPivotBase
  File "cylp\\cy\\CyOsiSolverInterface.pyx", line 1, in init cylp.cy.CyOsiSolverInterface
  File "cylp\\cy\\CyCbcModel.pyx", line 1, in init cylp.cy.CyCbcModel
  File "cylp\\cy\\CyOsiCuts.pyx", line 3, in init cylp.cy.CyOsiCuts
  File "c:\app\python39\lib\site-packages\cylp\py\__init__.py", line 1, in <module>
    from . import pivots
  File "c:\app\python39\lib\site-packages\cylp\py\pivots\__init__.py", line 3, in <module>
    from .PositiveEdgePivot import PositiveEdgePivot
  File "c:\app\python39\lib\site-packages\cylp\py\pivots\PositiveEdgePivot.py", line 10, in <module>
    from cylp.cy.CyClpSimplex import cydot
ImportError: cannot import name 'cydot' from partially initialized module 'cylp.cy.CyClpSimplex' (most likely due to a circular import) (c:\app\python39\lib\site-packages\cylp\cy\CyClpSimplex.cp39-win_amd64.pyd)    
>>>

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