Problem with Mac VS when running Lean - System.DllNotFoundException: python3.6m by ScottB

ScottB INVESTOR

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HI,

I am having some trouble getting Lean to run correctly on Mac using Python. The C# version works correctly and runs without issue. However when I follow the instructions to use python in the Algorithm.Python project get the following error when running Lean (command line or direct in VS):

ERROR:: Loader.TryCreatePythonAlgorithm(): System.DllNotFoundException: python3.6m

running which python3.6m returns /Users/<currentuser>/anaconda3/bin/python3.6m

Does anyone have an idea how to fix this problem?

Many thanks

Scott

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Jakob P.

19 ,

Have the same problem, has anyone a solution?

macOS High Sierra 10.13.6

conda 4.6.4 with Python 3.6.6

Alexandre Catarino

Hi ScottB and Jakob,
Are you running the latest Lean? About one month ago, we have added a patch that should handle issues with macOS running Python algorithms in Lean. I have tried and could install a clean version of Lean without a problem.

Is it the only python installation in your PC?

Jakob P.

19 ,

Hi Alexandre,

I did a clean install of MacOs
installed VS for Mac
installed R from readme link
installed Anaconda from readme link
installed via conda Python==3.6.6, Pandas and Dependencies

when I open the project the Nuget Packages are restored. When building and running Lean in CSharp it works and displays all the sample output. If i select Python i get the same error ScottB posted.

Alexandre Catarino

Hi Jakob P., sorry for the wait.

Could you please contact me in quantconnect /slack?
Perhaps it is an edge case and we will need to collect more information to improve the guide.

Best regards,
Alex

Makoto Watanabe

9 ,

Hi,

I'm suffering from the same error.

Could you kindly let me know how to resolve this issue?

Link Liang

6.1k ,

Hi Makoto,

We are sorry to hear that. Could you please provide more information about the version of your MacOS, visual studio, python and Lean? Have you installed more than one version of python? We need your help to improve our service!

Andrew Schwartz

64 ,

Hello,

I'm experiencing this issue trying to get pythn setup. C# works fine.

I'm installing python with pyenv (3.6.8) and then install anaconda. Anaconda seems to install 3.8 - as a solution I'm creating an environment with python 3.6.8 named Lean. The path would be as follows: {/Users/Username/opt/anaconda3/envs/Lean/lib/libpython3.6m.dylib}. After creating the environment I'm activating it in the terminal and running `pip install pandas`. Then I'm adding this line to the Python.Runtime.dll.config file:

<dllmap dll="python3.6m" target="{/Users/andrew/opt/anaconda3/envs/Lean/lib/libpython3.6m.dylib}" os="!windows"/>

Still getting the following error:

Loader.TryCreatePythonAlgorithm():  System.DllNotFoundException: {/Users/andrew/opt/anaconda3/envs/Lean/lib/libpython3.6m.dylib} assembly:<unknown assembly> type:<unknown type> member:(null)

Thanks,

Andrew

Andrew Schwartz

64 ,

Oops! Silly mistake - Removed the brackets from the file path in Python.Runtime.dll.config. Works!

ScottB INVESTOR

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