🌟 Teacher Xiong's Programming Class - Lesson 1

Topic: Exploring "Addition" and Data Types in Python (初探 Python 中的「加法」与数据类型)

🕒 Class Start: A Warm-Up Question （课堂开始：热身小问题）

Teacher Xiong: Good afternoon, everyone! Today we’ll start with a simple problem—what’s 1 plus(加) 1?

Wang Wuhao: Teacher, are you looking down on（小看） us? 1 plus 1 is definitely 2!

Li Han: Exactly! Even elementary(初级的) school students know that.

Wang Wuhao: But… I have a feeling（感觉） it’s not that simple.

Ye Daining: Could it be "1 minus 1 equals 3"? Hahaha! I’m such a good boy a genius（天才）!

Jiang Chenyi: Let’s stop guessing, everyone. In my opinion（依我看来）, this question is probably trickier than it seems.

🖥️ Hands-On Code: First Doubt （代码实操：第一个小疑问）

Teacher Xiong: Since you have doubts（疑问）, let’s look at code directly—what happens if I run print('1+1')?

Cheng Chen: It must be 2! Teacher, are you still half-asleep（半睡 没睡醒）?

Wang Wuhao: No, there’s a detail here! Without the English quotation marks（引号）, print(1+1) would give 2. But with the quotation marks, '1+1' becomes a string, so the output should be the characters 1+1 themselves（本身）.

Jiang Chenyi: That’s right. I agree with（同意） Wang Wuhao.

Ye Daining: I get it too! Quotation marks are so important（重要的） here～

Cheng Chen: Oh! So that’s how it works! I totally understand（理解） now!

⚠️ Advanced Challenge: What to Do When an Error Occurs? （进阶挑战：遇到报错怎么办？）

Teacher Xiong: Great job!（很好） You all now know the difference between print('1+1') (outputs a string) and print(1+1) (outputs the calculation result 2). Now, let’s step it up—what will print(1+'1') give?

Qian Yuze: Huh? What kind of operation（操作） is this?

Bao Youting: Step aside（靠边站）, everyone—I’m about to show off（展示） my skills… Wait, actually（其实）, I don’t know either（同样 也）. Hehe～

Li Han: Stop guessing! Let’s just open PyCharm and test it out（尝试出来）!

Wang Wuhao: Teacher, I tried it, and it reported an error right away! The error message（信息） is:

TypeError: unsupported operand type(s) for +: 'int' and 'str'

Teacher Xiong: Exactly. The error（错误） Wang Wuhao mentioned（注意） is exactly（确实） because of（因为） this line of code.

Zhang Zihao: Teacher, I can’t understand（懂） English. It’s so frustrating（气死我了）!

Wang Wuhao: I get it now. The error happens because the data types are different—you can’t add（加） them directly. One is an int (integer) type, and the other is a str (string) type.

Teacher Xiong: That’s correct. Congratulations（恭喜）, Wang Wuhao—you guessed it right!

Everyone: Hahaha（哈哈哈哈哈）!