Usage and Output¶
Otter Assign is called using the
otter assign command. This command takes in two required
arguments. The first is
master, the path to the master notebook (the one formatted as described
above), and the second is
result, the path at which output shoud be written. Otter Assign will
automatically recognize the language of the notebook by looking at the kernel metadata; similarly,
if using an Rmd file, it will automatically choose the language as R. This behavior can be
overridden using the
-l flag which takes the name of the language as its argument.
The default behavior of Otter Assign is to do the following:
Filter test cells from the master notebook and write these to test files
Add Otter initialization, export, and
Clear outputs and write questions (with metadata hidden), prompts, and solutions to a notebook in a new
Write all tests to
Copy autograder notebook with solutions removed into a new
Write public tests to
Run all tests in
autograder/testson the solutions notebook to ensure they pass
generateis passed,) generate a Gradescope autograder zipfile from the
The behaviors described in step 2 can be overridden using the optional arguments described in the help specification.
An important note: make sure that you run all cells in the master notebook and save it with the outputs so that Otter Assign can generate the test files based on these outputs. The outputs will be cleared in the copies generated by Otter Assign.
Python Output Additions¶
The following additional cells are included only in Python notebooks.
Export Formats and Flags¶
By default, Otter Assign adds an initialization cell at the top of the notebook with the contents
# Initialize Otter import otter grader = otter.Notebook()
To prevent this behavior, add the init_cell: false configuration in your assignment metadata.
Otter Assign also automatically adds a check-all cell and an export cell to the end of the notebook. The check-all cells consist of a Markdown cell:
To double-check your work, the cell below will rerun all of the autograder tests.
and a code cell that calls
The export cells consist of a Markdown cell:
## Submission Make sure you have run all cells in your notebook in order before running the cell below, so that all images/graphs appear in the output. **Please save before submitting!**
and a code cell that calls
otter.Notebook.export with HTML comment filtering:
# Save your notebook first, then run this cell to export. grader.export("/path/to/notebook.ipynb")
For R assignments, the export cell looks like:
# Save your notebook first, then run this cell to export. ottr::export("/path/to/notebook.ipynb")
These behaviors can be changed with the corresponding assignment metadata configurations.
Note: Otter Assign currently only supports HTML comment filtering. This means that if you have other cells you want included in the export, you must delimit them using HTML comments, not using cell tags.
Otter Assign Example¶
Consider the directory stucture below, where
hw00/hw00.ipynb is an Otter Assign-formatted
hw00 ├── data.csv └── hw00.ipynb
To generate the distribution versions of
hw00.ipynb (after changing into the
directory), you would run
otter assign hw00.ipynb dist
If it was an Rmd file instead, you would run
otter assign hw00.Rmd dist
This will create a new folder called
student as subdirectories,
as described above.
hw00 ├── data.csv ├── dist │ ├── autograder │ │ ├── hw00.ipynb │ │ └── tests │ │ ├── q1.(py|R) │ │ └── q2.(py|R) # etc. │ └── student │ ├── hw00.ipynb │ └── tests │ ├── q1.(py|R) │ └── q2.(py|R) # etc. └── hw00.ipynb
In generating the distribution versions, you can prevent Otter Assign from rerunning the tests using
otter assign --no-run-tests hw00.ipynb dist
Because tests are not run on R notebooks, the above flag would be ignored if
had an R kernel.