1. 让错误暴露，而不是把错误当正确示范 · 实现代码

# Detached readonly runs write only to an isolated ephemeral directory.
import os, tempfile
_LAB_WORKDIR = tempfile.mkdtemp(prefix="lecture03-lab15-")
os.chdir(_LAB_WORKDIR)
print("ephemeral workdir:", _LAB_WORKDIR)

from pathlib import Path
import json, hashlib, platform, sys
from datetime import datetime, timezone
import numpy as np
from PIL import Image, ImageDraw
import matplotlib
if 'get_ipython' not in globals(): matplotlib.use('Agg')
import matplotlib.pyplot as plt
from matplotlib.patches import Rectangle
OUT=Path('outputs/lab15');OUT.mkdir(parents=True,exist_ok=True)
PALETTE={'red':(214,55,55),'blue':(40,105,218),'brown':(146,95,53)}
boxes=['left-red','right-blue','book']
def keyword_match(phrase):
    if 'red' in phrase and 'left of' not in phrase:return boxes[0]
    if 'blue' in phrase:return boxes[1]
    return boxes[0]
phrases=['red cup','blue cup','cup left of blue cup']
for p in phrases:print('historical keyword baseline:',p,'->',keyword_match(p))
assert keyword_match(phrases[-1])=='right-blue' # This is the demonstrated ERROR.