The Create Performance Task (guided) · ⁨创作型表现任务(引导)⁩ — Python for AP CS Principles

English

The Create Performance Task

The Create Performance Task is a small program you design and build yourself.
For the real AP exam you submit it (your code, a video, and written answers) through the AP Digital Portfolio.
Important: the real task is graded by AP, not by this site. This lesson only helps you practice and structure it.

中文

创作型表现任务

创作型表现任务(Create Performance Task)是一个你自己设计和编写的小程序。
在真正的 AP 考试里,你要通过 AP 数字作品集(AP Digital Portfolio)提交它(你的代码、一段视频和书面回答)。
重要提示: 真正的任务由 AP 评分,不是由本网站评分。这节课只帮助你练习并搭好结构。

AP Create 表现性任务的四项必备要素清单

English

What your program must include

A list (or other collection) that stores many values together.
A procedure (a function) that takes at least one parameter, and that you call in your code.
An algorithm with selection (if) inside iteration (a loop).
Some input and some output so the program does something useful.

中文

你的程序必须包含什么

一个列表(list,或其他集合),把许多值存放在一起。
一个过程(procedure,即函数),它带有至少一个参数,并且你在代码里调用了它。
一个算法,在迭代(循环)内部使用选择(if)。
一些输入和一些输出,让程序做点有用的事。

English

Pick a small idea

Keep it simple: you only need to show the skills above, not build a huge app.
Good ideas: grade a list of scores, total a shopping list, sort students into teams, count words.
Choose data you understand, so you can explain it later.

中文

挑一个小点子

保持简单:你只需要展示上面这些技能,而不必做一个庞大的应用。
好点子:给一组分数评级、把购物清单求和、把学生分到不同小组、统计单词数。
选你看得懂的数据,这样你之后才能解释它。

English

A starter scaffold

The program below has all the required parts. Read the comments to find each one.
It uses a fixed list so it runs the same every time (no live typing needed here).
Run it, then change the data and rules to make it your own.

中文

一个起始脚手架

下面的程序包含了所有必需的部分。读注释,找出每一个部分。
它使用一个固定的列表,所以每次运行结果都一样(这里不需要现场输入)。
先运行它,然后修改数据和规则,把它变成你自己的。

# 1) A LIST that stores many values
scores = [72, 95, 58, 88, 40, 67]

# 2) A PROCEDURE with a PARAMETER, that returns a result
def grade_for(score):
    # selection inside the procedure: choose a letter for one score
    if score >= 90:
        return "A"
    elif score >= 70:
        return "B"
    elif score >= 50:
        return "C"
    else:
        return "F"

# 3) An ALGORITHM: SELECTION (if) INSIDE ITERATION (for loop)
pass_count = 0
for s in scores:                 # iteration: visit every score
    letter = grade_for(s)        # call the procedure with a parameter
    if letter != "F":            # selection: is this a pass?
        pass_count = pass_count + 1
    print(f"score {s} -> grade {letter}")   # output

# More output: a summary
print(f"{pass_count} out of {len(scores)} passed")

English

Make it your own

Change the list to your own data (and try a different length).
Change the procedure: new rule, new parameter name, or return something else.
Change the algorithm: count something new, or keep only items that pass the if.
Add input if you like, for example input("Enter a name: ").

中文

把它变成你自己的

把列表换成你自己的数据(也试试不同的长度)。
修改过程:新的规则、新的参数名,或者返回别的东西。
修改算法:统计点新的东西,或者只保留通过 if 的那些项。
如果你愿意,可以加上输入,例如 input("Enter a name: ")。

English

Written-response prompts

Answer these about your own program (this is the kind of writing the real task asks for):
Purpose: What does your program do, and why is it useful?
List: What does your list store, and how does using one list (instead of many separate variables) make the program simpler to manage?

中文

书面回答题

围绕你自己的程序回答下面这些问题(真正的任务要求的就是这类写作):
目的: 你的程序做什么?为什么它有用?
列表: 你的列表存了什么?为什么用一个列表(而不是许多个单独的变量)会让程序更容易管理?

English

More written-response prompts

Procedure & parameter: Name your procedure. What is its parameter, and what does the procedure do with it? What does it return?
Algorithm: Describe the algorithm inside your loop in your own words. Point to where it uses selection (if) and where it uses iteration (the loop), and say why both are needed.

中文

Rubric checklist

Tick each item once your program has it:

中文

评分清单

当你的程序具备某一项后,就在它前面打勾:

[ ] A list (or collection) is used in the program
[ ] A procedure is defined WITH at least one parameter
[ ] That procedure is CALLED somewhere in the program
[ ] The procedure does real work (not empty)
[ ] An algorithm uses selection (if) INSIDE iteration (a loop)
[ ] The program has input and/or output
[ ] I can explain every part in my own words

English

You can do this

Start small, run it often, and fix one thing at a time.
When every box above is ticked, you have the structure the Create Task needs.
Remember: practice here first, then submit the real task through the AP Digital Portfolio.

中文

你一定可以做到

从小处开始,经常运行,一次只修一个地方。
当上面每个方框都打了勾,你就有了创作型任务所需要的结构。
记住:先在这里练习,然后通过 AP 数字作品集 提交真正的任务。

English

Common mistakes

Plan the program's purpose first, then build in small tested pieces.
Be ready to explain what each part of your code does.

中文

常见错误

先规划程序的目的,再小块构建、逐块测试。
要能解释代码每一部分的作用。

English

Now you try

A warm-up: assemble the required parts once, using the scaffold's example data.
Press Check answer to confirm every required part is there.

中文

现在轮到你

热身:用脚手架里的示例数据,把需要的部分组装一次。
按检查答案来确认每个必需的部分都在。

A warm-up that uses the scaffold's example data. (1) Keep the list scores. (2) Define grade_for(score) (one parameter) returning "A"/"B"/"C"/"F" by the rules above (>= 90, >= 70, >= 50, else "F"). (3) With selection (if) inside a loop over scores, count how many pass · ⁨通过⁩ (grade is not "F") into pass_count. (4) print a summary line. · ⁨用脚手架里的示例数据做一个热身。(1)保留列表 scores。(2)定义 grade_for(score)(一个参数),按上面的规则(>= 90、>= 70、>= 50,否则 "F")返回 "A"/"B"/"C"/"F"。(3)在遍历 scores 的循环里用选择(if),把通过(等级不是 "F")的数量数进 pass_count。(4)print 一行总结。⁩

scores = [72, 95, 58, 88, 40, 67]

# 1) Define grade_for(score): return "A"/"B"/"C"/"F" by the rules (>= 90, >= 70, >= 50, else "F")

pass_count = 0
# 2) Loop over scores; when the grade is not "F", add 1 to pass_count
# 3) print a summary line

Click Run to see the output here. · ⁨点击“运行”查看此处输出。⁩

The Create task also needs an algorithm you built yourself. Write top_score(scores) that returns the highest value using a loop — start with the first score, then compare each one. Do not · ⁨不⁩ use the built-in max. Then print the result. · ⁨创作型任务还需要一个你自己搭建的算法。写一个 top_score(scores),用循环返回最高的值 —— 先取第一个成绩,再逐个比较。不要用内置的 max。然后 print 出结果。⁩

scores = [72, 95, 58, 88, 40, 67]

# Define top_score(scores): return the highest value using a loop (no max())

# print the highest score

Click Run to see the output here. · ⁨点击“运行”查看此处输出。⁩

The Create Performance Task (guided) · ⁨创作型表现任务(引导)⁩