Failed to import gurobipy

Answered

Chien-Hao Huang

• November 16, 2020 12:27

As the picture is shown upward. Even I've reinstalled gurobi or anaconda, there is still an error. Does anyone know how to solve this problem?

My gurobi version is 9.1.0 and Python is 3.8.3.

Thx.

0

• Official comment

  

  Jaromił Najman

  Gurobi Staff

  • November 18, 2020 12:02
  • Edited

  Hi,

  First, you have to download the Gurobi Optimization Software from our website and install it, see the Software Installation Guide.

  Next, you open a terminal window. On Windows 10 you can achieve that by pressing the windows button, then typing \(\texttt{cmd}\) and hitting Enter. A terminal window should be opened. There, you navigate to you Gurobi installation folder via

  cd C:\gurobi910\win64

  This only works, if you installed Gurobi in its default location.

  Finally, you execute the command

  python setup.py install

  For more details, please have a look at our documentation on Manual installation for Python.

  Best regards,
  Jaromił
• 

  Jaromił Najman

  Gurobi Staff

  • November 16, 2020 20:13
  • Edited

  Hi,

  It seems like your environment variable \(\texttt{GUROBI_HOME}\) has no value. Therefore, the \(\texttt{os.getenv()}\) method returns a \(\texttt{None}\) object.

  Did you install the Gurobi 9.1 optimizer software? Just downloading it via pip or anaconda may not be enough, because pip or anaconda may not have the rights to set environment variables.

  How did you install Gurobi into your Python distribution?

  Could you try executing the command \(\texttt{python setup.py install}\) from inside your Gurobi installation folder, i.e., \(\texttt{<pathToGurobi>/gurobi910/win64}\)?

  Did you have a look at our Knowledge Base article How do I install Gurobi for Python?

  Best regards,
  Jaromił

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• 

  Chien-Hao Huang

  • November 17, 2020 05:00

  

  

  

  Hi,

  Here are the following steps for me to install Gurobi, and I use an Anaconda prompt:

  Step 1: Add the Gurobi channel to your default search list:

  conda config --add channels http://conda.anaconda.org/gurobi

  Step 2: Install the Gurobi package:

  conda install gurobi

  Step 3: Install the license. Copy and paste

  grbgetkey xxxxxx-xxxxxx

  command to the terminal / prompt. 

   

  Could you mind tell more detail about executing the command

  python setup.py install 

  from inside the Gurobi installation folder? I could not understand what you mean.

  Thx.

  0
• 

  Chien-Hao Huang

  • November 17, 2020 09:06

  

  

  

  Hi Jaromił, 

  Thanks for your help, now I've succeeded to import gurobipy. Really appreciate.

   

  Sincerely, 

  Chien-Hao Huang

   

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• 

  Vanja Zomer

  • November 17, 2020 11:16

  

  

  

  Thank you very much Jaromil! It works for me too now!

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