Nbgrader

nbgrader type access

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Nbgrader app is a JupyterHub based application with nbgrader configured in order to facilitate the creation and grading of assignments via Jupyter notebook. It allows instructors to easily create notebook-based assignments that include both coding exercises and written free-responses. Nbgrader also provides a streamlined interface for quickly grading completed assignments.

For more information, check here.

Course directory structure

The instructor username is by default ucloud. From the instructor side, all data is stored in files in the course directory. The general structure of the course directory is:

{nbgrader_step}/{student_id}/{assignment_id}/{notebook}.ipynb

{nbgrader_step} indicates the progress of the notebook: source, release, submitted, autograded, feedback.

Mandatory parameters

As mandatory parameters the instructor needs to specify:

  • Course ID, name of the course directory (e.g. "course123")

  • Course directory path, path to the directory which includes the course directory

  • Number of students who have to solve the assignment.

Default configuration

By setting only the mandatory parameters, the instructor will start the application with default nbgrader configuration files. As a consequence the exchange directory is /tmp/exchange and the assignment files need to be in the course id/source directory.

To avoid student access to the source assignment directory c.CourseDirectory.root = /home/ucloud.

Note

Once the application is stopped, all course files will be present in the course directory path.

In addition, if no jupyterhub_config.py is present in the course directory path, a default config file will be used.

Instead of using the default settings, customized nbgrader configuration files for instructor and students can be selected via the corresponding optional parameters.

Login credentials and student access

When the application starts, the file userlist_pwd.txt is created with a random password for the default instructor user (ucloud), followed by username and random password for each of the students. The file can be accessed in the /work directory, by opening a terminal window from the job progress view page.

In order to allow students to access the JupyterHub server, the app must be deployed with a public URL. This link should be sent to each student along with the corresponding username and password listed in userlist_pwd.txt .

From the server, students can fetch, validate and submit assignments, as well as retrieve the instructor feedback.

Important

The nbgrader_config.py file in the student home directory should not be renamed.