Numerical Answers with Python¶
This page is specific to the Python questions (without coding). The objectives are:
- Use the necessary Python function in the
server.py
to generate the solutions, and grade the questions - Specify the randomized variables in the
server.py
- Specify the specific files (e.g., figure) in the
server.py
Overview¶
The easiest way to create a Python question (without coding) is by copying an existing question (either Python or R), and change certain files. Then you don’t need to create the UUID by yourself.
Note: Each UUID will be assigned to a question only.
Step 1: Copy a question¶
- Follow the Step 1 to Step 4 in the Routine work. Then click PrarieLearn logo (next to Admin) in the upper left.
- Click a course such as
CEE 202: Engineering Risk & Uncertainty
in theCourses
(notCourse instances
) list. - Click the
Questions
(next toIssues
) on the top line. - Find a question you want to copy (for example:
AS4_Prob5_2020_AngTang
). - Click
Settings
betweenPreview
andStatistics
. - Click
Make a copy of this question
- Click
Change QID
Step 2: Modify the questions¶
Before you modifying the question, I strongly suggest creating a spreadsheet to keep track of the questions (including title, topic, tags) and corresponding UUID.
Note: Each question folder contain the following files
Folder/File Name | Usage |
---|---|
info.json | The information of the question such as title, topic, tags, and uuid. |
question.html | The main body of the question |
server.py | The solution to the question, but it also species |
clientFilesQuestion | Save the figures for the question. |
clientFilesQuestion /dist.png |
The figure needes to be added to the question |
info.json¶
- Click
Edit
underSettings
- Define the
title
,topic
,tags
, andtype
server.py¶
- Click
Files
(underPrairieLearn
in the upper left) →Edit
theserver.py
, then you need to finish the following tasks:
import rpy2.robjects as robjects
import prairielearn as pl
import numpy as np
from numpy import arange
from numpy.random import choice
def generate(data):
# start to code your solution
## "a" could be 3.8, 3.9, 4.0, 4.1, 4.2
a = choice(arange(3.8,4.3,0.1),1)
answer_a = a+1
# here is the end of your solution
# Setup output
data['correct_answers']["answer_a"] = answer_a
# Setup randomized variables
data["params"]["a"] = a
# define the figure name
image_name = "dist.png"
data["params"]["image"] = image_name
- import the necessary packages at the beginning
- Change the randomized variable using
a=choice(arange(start,end+interval,interval),1)
Note: a
corresponds to ${{params.a}}$
, answer_a
corresponds to answers-name="answer_a"
in the question.html
- Change the
image_name
(if you have figure(s))
question.html¶
- Click
Files
(underPrairieLearn
in the upper left) →Edit
thequestion.html
, then you need to finish the following tasks:
<pl-question-panel>
<p>
This is the problem statement.
</p>
<pl-figure file-name={{params.image}} directory="clientFilesQuestion"></pl-figure>
</pl-question-panel>
<pl-question-panel><hr></pl-question-panel>
<pl-question-panel>
<p>
(a) Determine the probability that the settlement will exceed ${{params.a}}$ cm.
</p>
</pl-question-panel>
<div class="card my-2">
<div class="card-body">
<pl-question-panel>
<p>The answer is: (0.XX)</p>
</pl-question-panel>
<pl-number-input answers-name="answer_a" weight = "3" comparison="relabs" rtol="0.01" atol="0.01"></pl-number-input>
</div>
</div>
- Replace “This is the problem statement.” with your problem statement
- Replace
${{params.a}}$
with your randomized variable fromserver.py
- Replace
"answer_a"
with your answer fromserver.py
- Define the tolerance. Sotiria suggests that:
- for the answer (0.XX),
comparison="relabs" rtol="0.01" atol="0.01"
- for the answer (0.XXX),
comparison="relabs" rtol="0.001" atol="0.001"
- for the answer (0.XX),
Alternatives: Integer¶
Reference: (link)
If the answer is an integer, you need to replace
<pl-number-input answers-name="answer_a" weight = "3" comparison="relabs" rtol="0.01" atol="0.01"></pl-number-input>
with
<pl-integer-input answers-name="answer_a" weight = 3></pl-integer-input>
Where the answer “answer_a” has to be an integer.
Step 3: Test your questions¶
- Click
Preview
to test - Click
New variant
to have another test
Step 4: Commit and push the changes¶
- Using Git to commit and push the changes
Note: You may do this after you finish all the questions
Step 5: Sync and test¶
- Log in the website https://prairielearn.engr.illinois.edu/pl/, and select your course
- Click
Sync
, thenPull from remote git repository
- Find your questions by clicking
Questions
and test them again