grade50

This is a small tool to be used in combination with the CS50 automarker check50. It allows to grade a student's submission based on check50's json report and a given grading scheme.

Synopsis

usage: grade50 [-h] [-v] [-o {ansi,json}] [-t TEMPLATE] [-V] scheme report

grade student submissions based on check50 json reports.

positional arguments:
  scheme
  report

optional arguments:
  -h, --help            show this help message and exit
  -v, --verbose
  -o {ansi,json}, --output {ansi,json}
                        output format
  -t TEMPLATE, --template TEMPLATE
                        jinja2 template for ansi output
  -V, --version         output version information and exit

Installation

pip install grade50

Grading Schemes

are given in YAML format and have to contain a list of parts, each of which is a dictionary defining a name and a list of checks. A check is a dictionary with

• name a string, has to appear as check name in the check50 report file. This means our problem set has a check (python function) by that name.
• points, an integer, the number of points given if the check passes. Can be zero.
• fail_comment (optional), a string that will be added as a feedback comment in case the check fails. This may contain variables that will be replaced by the contend of the check50 check. For instance, "{log}" for the logging strings or "{cause[rationale]}" for the rationale in failing checks. This will default to "{cause[rationale]}" if not given, i.e. the short string produced by check50 on the console if the check fails.
• pass_comment (optional), a string that will be added as a feedback comment in case the check passes. Sometimes it is nice to say "well done for X". This will default to no comment if unset.

Example:

- name: "Part 1"
  checks:
    - name: caesar_exists
      points: 0
      fail_comment: "Caesar.java was not submitted"
    - name: caesar_compiles
      points: 0
      fail_comment: "Caesar.java does not compile\n{log}"

- name: "Part 2"
  checks:
    - name: caesar_rotate_string_shift_5
      points: 2
      # no fail_comment set. This is equivalent to
      # fail_comment: {cause[rationale]}
      pass_comment: Your rotation seems to work. Well done!

    - name: caesar_many_args
      points: 2
      fail_comment: |
        Caesar does not print the right error message whe run with too many arguments (too many newlines/spaces?).
        expected was
        ---
        {cause[expected]}
        actual was
        ---
        {cause[actual]}

Output

grade50 can output either plain text or json data for further use in scripts.

json

use grad50 -o json to output json data. This will be a dictionary mapping points and points_possible to the total score and total possible score, respectively. Further, it maps parts to a list of dicts, each with

• name
• points
• points_possible
• comments (a list of comment strings for all checks in this part)

text

Textual output is the default. It is based on the above and the default template (see grade50/templates/default.jinja2). You can pass any other jinja2 template as by means of the --template option. This way one can easily generate for example latex sources that can be compiled into pdf feedback files for students.