How to install cantera in google colab

[raju darshan]

Hi users,

Does anyone knew how to install cantera in google colab. I installed conda into colab and then cantera.

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# INSTALL CONDA ON GOOGLE COLAB

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! wget https://repo.anaconda.com/miniconda/Anaconda3-py37_4.8.2-Linux-x86_64.sh

! chmod +x Anaconda3-py37_4.8.2-Linux-x86_64.sh

! bash ./Anaconda3-py37_4.8.2-Linux-x86_64.sh -b -f -p /usr/local

!conda install --channel cantera/label/dev cantera

import sys

sys.path.append('/usr/local/lib/python3.7/site-packages/')

when I see my conda list in colab I can see cantera in it but I can't able to import cantera from conda

!conda list

when I tried to import cantera it show me this error

[raju darshan]

[Bryan W. Weber]

Hi,

On this line:

sys.path.append('/usr/local/lib/python3.7/site-packages/')

I don't think that Miniconda installs itself to /usr/local/lib... if you specify the -p option to the installer, I would expect it go to into /usr/local/miniconda3/... But I've not done this before, so I could be wrong. Try listing out the filesystem paths in the /usr/local folder and see which folders exist.

Best,

Bryan

[raju darshan]

Hi Brian,

I tried to list out the file system path and came to know cantera location /usr/local/lib/python3.8/site-packages/cantera  In that folder I have all the data files but still I can't able to import it

Kind Regards,

Raju

[Bryan W. Weber]

It seems likely that there is a difference between the version of Python running on colab and the version of Python that Cantera was installed for. What is the output of

!python -V

I'm confused how the Cantera files ended up in the Python 3.8 site-packages directory since you installed Anaconda with Python 3.7...

Best,

Bryan

[raju darshan]

Hi Brian,

I managed to install python 3.7 in colab and I can see cantera is in python3.7/site-packages. But still I can't able to import. I have attached the screenshot of the error I am getting while I am trying to import cantera.

Kind regards

Darshan

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[Bryan W. Weber]

Hi Darshan,

Unfortunately, I've never used Colab before, so I'm not sure how to continue debugging this. Does the expected _cantera file exist somewhere in that directory? Do all the versions/file names match with the appropriate architecture/Python version? Do you have to continue using Colab, or can you install Anaconda on your own computer?

On a separate note, can you please copy/paste the error messages and code into your post, rather than a screenshot? There are a few reasons to prefer copy/pasting text directly, including searchability (text is searchable, images are not) and readability (text can be read by screen readers for blind users, images cannot). Thank you!

Best,

Bryan

[raju darshan]

Hi Brian, 

Finally I found a way to import cantera into google colab from [https://towardsdatascience.com/conda-google-colab-75f7c867a522]. Initially, the PYTHONPATH variable should be unset before installing Miniconda as it can cause problems if there are packages installed and accessible via directories included in the PYTHONPATH that are not compatible with the version of Python included with Miniconda. And then I Installed Miniconda and updated.  I have uploaded the colab file which contains the commands to import Cantera into Colab.

Kind regards

Darshan

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[Bryan W. Weber]

Great, I'm glad you got it working! Thank you for posting those steps.

Bryan

[Leonardo Baptista]

Hi,

I'm using cantera in google colab almost an year using the following lines:

!apt-add-repository ppa:speth/cantera

!apt-get -qq install -y cantera-python cantera-python3 cantera-dev

Those lines will install the cantera in the notebook.Further, it will be necessary to upload your .cti file using the lateral bar of Google Colab.

After the installation, will can edit your python scritp to run cantera as you wish.

Remember that the install and upload procedure should be done every time if you use a Colab free account.