Can't import CoolProp in Raspberry pi 4 Python 3.7.6

[LasseLRP]

Hello,

This is what I get:

Python 3.7.6 (default, Feb 19 2020, 16:18:37)
[GCC 8.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import matplotlib
>>> import CoolProp as CP
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/pi/python-source/Python-3.7.6/udemy/lib/python3.7/site-packages/CoolProp/__init__.py", line 22, in <module>
    __fluids__ = CoolProp.get_global_param_string('fluids_list').split(',')
  File "CoolProp.pyx", line 277, 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
>>>

Help appreciated.

[Ian Bell]

Please use the development version, this bug is fixed.

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[LasseLRP]

I ran this:

pip install -vvv --pre --trusted-host www.coolprop.dreamhosters.com --find-links http://www.coolprop.dreamhosters.com/binaries/Python/ -U --force-reinstall CoolProp

I have cmake and 7-zip.

Got a bit different error:

Python 3.7.6 (default, Feb 19 2020, 16:18:37)
[GCC 8.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.

>>> import CoolProp

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

  File "/usr/local/opt/python-3.7.6/lib/python3.7/site-packages/CoolProp/__init__.py", line 22, in <module>
    __fluids__ = CoolProp.get_global_param_string(b'fluids_list').split(',')
TypeError: a bytes-like object is required, not 'str'

On Thursday, February 20, 2020 at 3:21:30 AM UTC+2, Ian Bell wrote:

Please use the development version, this bug is fixed.

On Wed, Feb 19, 2020, 6:16 PM LasseLRP <lass...@gmail.com> wrote:

Hello,

This is what I get:

Python 3.7.6 (default, Feb 19 2020, 16:18:37)
[GCC 8.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import matplotlib
>>> import CoolProp as CP
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/pi/python-source/Python-3.7.6/udemy/lib/python3.7/site-packages/CoolProp/__init__.py", line 22, in <module>
    __fluids__ = CoolProp.get_global_param_string('fluids_list').split(',')
  File "CoolProp.pyx", line 277, 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
>>>

Help appreciated.

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[Ian Bell]

Well, the bug is fixed I believe, but we have the problem that our build system is partially broken right now, so your best bet is to build it yourself.  Also, on the Raspberry Pi, you don't have a choice, because binaries compiled for x86_64 will not work on an ARM architecture, which is what I believe you have on the Raspberry PI, or was last I checked.

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[LasseLRP]

I get alot of these:

 /usr/include/c++/8/bits/stl_vector.h:1549:4: note: parameter passing for argument of type ‘__gnu_cxx::__normal_iterator<const double*, std::vector<double> >’ changed in GCC 7.1
  /usr/include/c++/8/bits/stl_vector.h:1549:4: note: parameter passing for argument of type ‘std::vector<double>::iterator’ {aka ‘__gnu_cxx::__normal_iterator<double*, std::vector<double> >’} changed in GCC 7.1
      _M_range_insert(__pos, __first, __last,
      ^~~~~~~~~~~~~~~
  /usr/include/c++/8/bits/stl_vector.h:1549:4: note: parameter passing for argument of type ‘__gnu_cxx::__normal_iterator<const double*, std::vector<double> >’ changed in GCC 7.1
  /usr/include/c++/8/bits/stl_vector.h: In member function ‘void CoolProp::JSONFluidLibrary::parse_EOS(rapidjson::Value&, CoolProp::CoolPropFluid&)’:
  /usr/include/c++/8/bits/stl_vector.h:1085:4: note: parameter passing for argument of type ‘__gnu_cxx::__normal_iterator<CoolProp::EquationOfState*, std::vector<CoolProp::EquationOfState> >’ changed in GCC 7.1
      _M_realloc_insert(end(), __x);

Those changed in GCC 7.1-things...

I have gcc version 8.3.0

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[Ian Bell]

Those seem to be warnings, not errors?  I don't get that kind of output when I compile on linux with gcc 7.4.x for what its worth.

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[LasseLRP]

Tried this:

git clone https://github.com/CoolProp/CoolProp --recursive

sudo python3 setup.py install 

got this:

Python 3.6.9 (default, Nov  7 2019, 10:44:02)

[GCC 8.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import CoolProp
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>

  File "/home/ubuntu/CoolProp/wrappers/Python/CoolProp/__init__.py", line 5, in <module>
    from . import constants
  File "/home/ubuntu/CoolProp/wrappers/Python/CoolProp/constants.py", line 5, in <module>
    from . import _constants
ImportError: cannot import name '_constants'

Now running Ubuntu on Raspberry Pi 4

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[Ian Bell]

Move out of that directory before you try the python import.  I get tripped up by this all the time - it was trying to import from the build folder, and that doesn't work. I tried to find a nice way to warn about this, but never found an adequate solution.

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[LasseLRP]

From home directory, different error:

ubuntu@ubuntu:~$ python3

Python 3.6.9 (default, Nov  7 2019, 10:44:02)
[GCC 8.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import CoolProp
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>

  File "/usr/local/lib/python3.6/dist-packages/CoolProp-6.3.1.dev0-py3.6-linux-aarch64.egg/CoolProp/__init__.py", line 22, in <module>
    __fluids__ = CoolProp.get_global_param_string(b'fluids_list').split(b',')
TypeError: must be str or None, not bytes

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[Ian Bell]

Ugh... strings are a real headache when you have python 2, python 3, and cython in the mix. I was able to confirm this bug in both python 3.6 and 3.8 when building from source.

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[Ian Bell]

Try again now with updated cython. I think it should work...  But maybe I just broke python 2.7 ?

[LasseLRP]

Do mean 

sudo pip install --update Cython:

git clone https://github.com/CoolProp/CoolProp --recursive

cd CoolProp/wrappers/Python

sudo python setup.py install

On Saturday, February 22, 2020 at 9:30:57 PM UTC+2, Ian Bell wrote:

Try again now with updated cython. I think it should work...  But maybe I just broke python 2.7 ?

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[Ian Bell]

This should be enough:

cd CoolProp/wrappers/Python

git pull

sudo python setup.py install

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[LasseLRP]

!!!!! TaDaaa !!!!

ubuntu@ubuntu:~$ python3.8
Python 3.8.0 (default, Feb 22 2020, 19:21:55)
[GCC 7.4.0] on linux

Type "help", "copyright", "credits" or "license" for more information.
>>> import CoolProp
>>>

It worked. Thanks a lot!

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[Vikram Govindarajan]

I am facing the same issue in python3.8 in WSL ubuntu 2004. I installed CoolProp 6.4.1 with the source downloaded from pypi. Can you please tell me what I should be doing in summary? 

File "stringsource", line 15, in string.from_py.__pyx_convert_string_from_py_std__in_string
TypeError: expected bytes, str found

[Ian Bell]

Please try the new binary wheels: https://github.com/CoolProp/CoolProp/issues/2119

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[Vikram Govindarajan]

The latest wheels in pypi are not available on my platform (WSL Ubuntu 2004 on Windows 10). Whether the latest source available? Also, how to install CoolProp from source?

Help appreciated.

[Ian Bell]

Right,  you need to use the development wheels indicated in the issue I linked. Also,  I backported binary wheels for all platforms for 6.4.1 two days ago,  so try it again

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