pip install on windows failing

[Tue]

I’m trying to install petsc for python on windows, using the following command:

pip install petsc petsc4py

However when I do this in anaconda I get the following:

(base) C:\Users\alyfl> pip install petsc --no-cache-dir

Collecting petsc
Downloading https://files.pythonhosted.org/packages/31/0a/aecec2c090617258c813d369e631cb4882bb6844e3bbfed917cb3391035e/petsc-3.11.1.tar.gz (13.6MB)
|████████████████████████████████| 13.6MB 6.4MB/s
Building wheels for collected packages: petsc
Building wheel for petsc (setup.py) ... error
ERROR: Command errored out with exit status 1:
command: 'C:\Anaconda3\python.exe' -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\Users\alyfl\AppData\Local\Temp\pip-install-xl_fsd3b\petsc\setup.py'"'"'; file='"'"'C:\Users\alyfl\AppData\Local\Temp\pip-install-xl_fsd3b\petsc\setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(file);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, file, '"'"'exec'"'"'))' bdist_wheel -d 'C:\Users\alyfl\AppData\Local\Temp\pip-wheel-oi0f_gde' --python-tag cp37
cwd: C:\Users\alyfl\AppData\Local\Temp\pip-install-xl_fsd3b\petsc
Complete output (1 lines):
petsc: this package cannot be built as a wheel

ERROR: Failed building wheel for petsc
Running setup.py clean for petsc
Failed to build petsc
Installing collected packages: petsc
Running setup.py install for petsc ... error
ERROR: Command errored out with exit status 1:
command: 'C:\Anaconda3\python.exe' -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\Users\alyfl\AppData\Local\Temp\pip-install-xl_fsd3b\petsc\setup.py'"'"'; file='"'"'C:\Users\alyfl\AppData\Local\Temp\pip-install-xl_fsd3b\petsc\setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(file);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, file, '"'"'exec'"'"'))' install --record 'C:\Users\alyfl\AppData\Local\Temp\pip-record-gcsu4zbt\install-record.txt' --single-version-externally-managed --compile
cwd: C:\Users\alyfl\AppData\Local\Temp\pip-install-xl_fsd3b\petsc
Complete output (32 lines):
running install
PETSc: configure
configure options:
--prefix=C:\Anaconda3\Lib\site-packages\petsc
PETSC_ARCH=arch-python-win-amd64
--with-shared-libraries=1
--with-debugging=0
--with-c2html=0
--with-mpi=0
===============================================================================
Configuring PETSc to compile on your system
===============================================================================
===============================================================================
*** Windows python detected. Please rerun ./configure with cygwin-python. ***
===============================================================================
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "C:\Users\alyfl\AppData\Local\Temp\pip-install-xl_fsd3b\petsc\setup.py", line 314, in <module>
**metadata)
File "C:\Anaconda3\lib\site-packages\setuptools_init_.py", line 145, in setup
return distutils.core.setup(**attrs)
File "C:\Anaconda3\lib\distutils\core.py", line 148, in setup
dist.run_commands()
File "C:\Anaconda3\lib\distutils\dist.py", line 966, in run_commands
self.run_command(cmd)
File "C:\Anaconda3\lib\distutils\dist.py", line 985, in run_command
cmd_obj.run()
File "C:\Users\alyfl\AppData\Local\Temp\pip-install-xl_fsd3b\petsc\setup.py", line 230, in run
config(prefix, self.dry_run)
File "C:\Users\alyfl\AppData\Local\Temp\pip-install-xl_fsd3b\petsc\setup.py", line 166, in config
if status != 0: raise RuntimeError(status)
RuntimeError: 3

---

ERROR: Command errored out with exit status 1: 'C:\Anaconda3\python.exe' -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\Users\alyfl\AppData\Local\Temp\pip-install-xl_fsd3b\petsc\setup.py'"'"'; file='"'"'C:\Users\alyfl\AppData\Local\Temp\pip-install-xl_fsd3b\petsc\setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(file);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, file, '"'"'exec'"'"'))' install --record 'C:\Users\alyfl\AppData\Local\Temp\pip-record-gcsu4zbt\install-record.txt' --single-version-externally-managed --compile Check the logs for full command output.

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I have searched around online, for quite a while now, but haven’t been able to find anything, and reading the logfile, it mentions cygwin-python but not much else is offered. How do I resolve this issue?

[Lisandro Dalcin]

This way of installing is not supported on Windows, sorry.

[Tue]

If windows is not supported, I think this needs to be written clearly on the install page, right now there is absolutely nothing about windows not being supported here:

https://pypi.org/project/petsc4py/

And the error message given back, when you try to run it also doesn’t say this.

[Lisandro Dalcin]

Well, in the PyPI page you link, if you look down left, you should notice “Operating System: POSIX”. The reason pip install petsc4py does not work is that pip install petsc is not supported on Windows. PETSc is a large project (of which I’m a contributor) and many of it features come from volunteers. So far, no one has contribute a native Windows build, we depend on Cygwin to build PETSc on Windows. I tried to make it work years ago and failed miserably, it involved too much work and I’m lacking enough Windows expertise. An alternative option would be to distribute pre-compiled PETSc and petsc4py binaries, but again, I’m not in a good position to provide and maintain the required infrastructure. You should raise your concerns and complaints to the PETSc users or development mailing list.

[Tue]

Okay fair enough I didn’t see that.

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