Problem 1.4 - Internal Reactions
[Problem adapted from © Chris Galitz CC BY NC-SA 4.0]
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from shiny import App, render, ui, reactive
import random
import asyncio
import io
import math
import string
from datetime import datetime
from pathlib import Path
def generate_random_letters(length):
# Generate a random string of letters of specified length
return "".join(random.choice(string.ascii_lowercase) for _ in range(length))
problem_ID = "644"
x1 = reactive.Value("__")
x2 = reactive.Value("__")
P = reactive.Value("__")
w = reactive.Value("__")
attempts = ["Timestamp,Attempt,Answer1,Answer2,Answer3,Answer4,Answer5,Answer6,Feedback\n"]
app_ui = ui.page_fluid(
ui.markdown("**Please enter your ID number from your instructor and click to generate your problem**"),
ui.input_text("ID", "", placeholder="Enter ID Number Here"),
ui.input_action_button("generate_problem", "Generate Problem", class_="btn-primary"),
ui.markdown("**Problem Statement**"),
ui.output_ui("ui_problem_statement"),
ui.input_text("answer1", ui.span("Normal force at x", ui.tags.sub("1"), " in units of kip"), placeholder="Please enter the normal force at x1"),
ui.input_text("answer2", ui.span("Shear force at x", ui.tags.sub("1"), " in units of kip"), placeholder="Please enter the shear force at x1"),
ui.input_text("answer3", ui.span("Bending moment at x", ui.tags.sub("1"), " in units of kip-ft"), placeholder="Please enter the bending moment at x1"),
ui.input_text("answer4", ui.span("Normal force at x", ui.tags.sub("2"), " in units of kip"), placeholder="Please enter the normal force at x2"),
ui.input_text("answer5", ui.span("Shear force at x", ui.tags.sub("2"), " in units of kip"), placeholder="Please enter the shear force at x2"),
ui.input_text("answer6", ui.span("Bending moment at x", ui.tags.sub("2"), " in units of kip-ft"), placeholder="Please enter the bending moment at x2"),
ui.input_action_button("submit", "Submit Answers", class_="btn-primary"),
ui.download_button("download", "Download File to Submit", class_="btn-success"),
)
def server(input, output, session):
# Initialize a counter for attempts
attempt_counter = reactive.Value(0)
@output
@render.ui
def ui_problem_statement():
return [
ui.markdown(
f"The simply-supported beam is subjected to the loading shown. Determine the internal normal force, N, shear force, V, and bending moment, M, at locations x<sub>1</sub> = {x1()} ft and x<sub>2</sub> = {x2()} ft. Assume loads P = {P()} kips and w = {w()} kips/ft. Use appropriate signs in your answers."
)
]
@reactive.Effect
@reactive.event(input.generate_problem)
def randomize_vars():
random.seed(input.ID())
x1.set(random.randrange(41,69,1)/10)
x2.set(random.randrange(75,115,1)/10)
P.set(random.randrange(5,25,1))
w.set(random.randrange(20,50,1)/10)
@reactive.Effect
@reactive.event(input.submit)
def _():
attempt_counter.set(
attempt_counter() + 1
) # Increment the attempt counter on each submission.
# Calculate the instructor's answer and determine if the user's answer is correct.
instr1 = 0
Ay = (P()*2+w()*4*9)/14
instr2 = Ay-w()*(x1()-3)
instr3 = w()*(x1()-3)*(3+(x1()-3)/2)+instr2*x1()
instr4=0
instr5= Ay-w()*4
instr6= Ay*x2()-w()*4*(x2()-5)
correct1 = math.isclose(float(input.answer1()), instr1, rel_tol=0.01)
correct2 = math.isclose(float(input.answer2()), instr2, rel_tol=0.01)
correct3 = math.isclose(float(input.answer3()), instr3, rel_tol=0.01)
correct4 = math.isclose(float(input.answer4()), instr4, rel_tol=0.01)
correct5 = math.isclose(float(input.answer5()), instr5, rel_tol=0.01)
correct6 = math.isclose(float(input.answer6()), instr6, rel_tol=0.01)
if correct1 and correct2 and correct3 and correct4 and correct5 and correct6:
check = "all correct"
else:
conditions = []
for i, correct in enumerate([correct1, correct2, correct3, correct4, correct5, correct6], start=1):
if correct:
conditions.append(f"correct for answer {i}")
else:
conditions.append(f"incorrect for answer {i}")
check = "; ".join(conditions) + "."
correct_indicator = "JL" if correct1 and correct2 and correct3 and correct4 and correct5 and correct6 else "JG"
random_start = generate_random_letters(4)
random_middle = generate_random_letters(4)
random_end = generate_random_letters(4)
encoded_attempt = f"{random_start}{problem_ID}-{random_middle}{attempt_counter()}{correct_indicator}-{random_end}{input.ID()}"
session.encoded_attempt = reactive.Value(encoded_attempt)
attempts.append(f"{datetime.now()}, {attempt_counter()}, {input.answer1()}, {input.answer2()}, {check}\n")
feedback = ui.markdown(f"Your answers of {input.answer1()}, {input.answer2()}, {input.answer3()}, {input.answer4()}, {input.answer5()}, and {input.answer6()} are {check}")
m = ui.modal(feedback, title="Feedback", easy_close=True)
ui.modal_show(m)
@session.download(filename=lambda: f"Problem_Log-{problem_ID}-{input.ID()}.csv")
async def download():
final_encoded = session.encoded_attempt() if session.encoded_attempt is not None else "No attempts"
yield f"{final_encoded}\n\n"
yield "Timestamp,Attempt,Answer1,Answer2,Feedback\n"
for attempt in attempts[1:]:
await asyncio.sleep(0.25)
yield attempt
app = App(app_ui, server)