"variable not defined" error after reopening saved python project

[Shane Greeno]

Hi,

I'm new to the Jupyter notebook.  After recently reopening a project that I started, I am getting an error stating that none the previous variables I'd created have been defined when I try to use them.  Any advice on this would be greatly appreciated.  

Thanks!

[MinRK]

The Kernel is a process where your code runs. Each notebook has a kernel. Variables defined in a notebook live in the memory of this process. If the process is killed or restarted, then those variables are gone, and must be reloaded or recreated.

-MinRK

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[Shane Greeno]

Thanks for your reply.  So is the answer to leave the notebook always running?

[Mario Menezes]

Hi

A possible mistake is the following: create a variable later in the code, after some error message but forget to put the cell in the proper position in the code.
Then, if when you run the code top-down, after restarting the kernel, that variable won't be defined because its cell is down to the end of the notebook, after it's first mentioned.

Hope this helps.

[Martin Sandve Alnæs]

No, you just need to execute the cells again in the same order to recreate the variables. If you have deleted cells you cannot reproduce the original result.

Martin

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[Shane Greeno]

Problem solved!  I can't believe I didn't think of this.  Thank you.

[Shane Greeno]

Thanks for your help!