Error when importing CoolProp in python

[Luuk den Toom]

Hi,

Due to a problem with Windows on my laptop I needed to reset my laptop and download a new image of windows 11. This also deleted all downloaded programs from my laptop, including Python and CoolProp.
During the download of CoolProp I got an error message (see the first 2 pictures attached) while building the wheels for CoolProp. I looked for a solution online and found that downloading Visual Studio Installer  (Microsoft C++ Build Tools) should fix the issue.  After downloading Visual Studio Installer I was able to download CoolProp, but now it gives an error when import CoolProp into a python file (see the 3rd picture attached).
I can't find any solutions online this time. Does somebody know how to fix this issue?

This is the Github link which stated that Visual Studio Installer should fix the problem:
https://stackoverflow.com/questions/64261546/how-to-solve-error-microsoft-visual-c-14-0-or-greater-is-required-when-inst 

I have also attached a picture with all installed packages and the corresponding versions.

[Chris N]

Just to double check. After getting the C++ dependency installed, when you ran the "pip install Coolprop", it reported no errors?

[Luuk den Toom]

Yeah, after installing C++ the installation of CoolProp through 'pip install Coolprop' went fine and the list of downloaded packages also shows that Coolprop 6.6.0 has been installed.

[Ian Bell]

This is very strange, I can confirm the behavior though:

(py313) PS C:\Users\ian> pip install coolprop
Collecting coolprop
  Downloading CoolProp-6.6.0.tar.gz (14.0 MB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 14.0/14.0 MB 5.5 MB/s eta 0:00:00
  Installing build dependencies ... done
  Getting requirements to build wheel ... done
  Installing backend dependencies ... done
  Preparing metadata (pyproject.toml) ... done
Building wheels for collected packages: coolprop
  Building wheel for coolprop (pyproject.toml) ... done
  Created wheel for coolprop: filename=CoolProp-6.6.0-cp313-cp313-win_amd64.whl size=1629176 sha256=21192405f0ca9422ffeb78e0f4424f08234e38280687a2ba1cf477094e466d1d
  Stored in directory: c:\users\ian\appdata\local\pip\cache\wheels\01\44\36\e1e42f3bfc3b5aae8e6609ab58aaa33887d7770fc8baaab7da
Successfully built coolprop
Installing collected packages: coolprop
Successfully installed coolprop-6.6.0
(py313) PS C:\Users\ian> python
Python 3.13.1 | packaged by conda-forge | (main, Dec  5 2024, 21:02:16) [MSC v.1942 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import CoolProp
Traceback (most recent call last):
  File "<python-input-0>", line 1, in <module>
    import CoolProp
  File "D:\Users\ian\miniforge3\envs\py313\Lib\site-packages\CoolProp\__init__.py", line 22, in <module>
    __fluids__ = CoolProp.get_global_param_string('fluids_list').split(',')
                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^
  File "CoolProp.pyx", line 309, in CoolProp.CoolProp.get_global_param_string
  File "<stringsource>", line 15, in string.from_py.__pyx_convert_string_from_py_std__in_string
TypeError: expected bytes, str found

I thought we had resolved all these issues with bytes and str, but maybe something has changed in py 3.13 with that

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[Ian Bell]

I think something changed for python 3.13. I am not sure whether in cython or Python, but nevertheless, I believe I have fixed it. The next release will have updated wheels, but in the meantime, you can download the build artifact from github: https://github.com/CoolProp/CoolProp/actions/runs/12551565084/artifacts/2372700317 and then install the right wheel from that.

[philosophiseover phiseover]

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