CS61A Lab 1: Variables & Functions, Control
快速回顾
1. 命令行运行python
python3 foo.py,运行文件python3 -i foo.py,运行python脚本，并打开一个交互式会话python3 -m doctest foo.py,运行doctest
2. 命令行运行ok
python3 ok -q <specified function>, 运行指定函数python3 ok -v, 模式不显示已通过的样例，-v可以全部显示print("DEBUG:", x), 调试打印功能
主题
1. 除法
- True Division: / (decimal division)，常规除法
- Floor Division: // (integer division)，整除
- Modulo: % (remainder)，取模
2. 函数及其调用
To evaluate a function call:
- Evaluate the operator, and then the operands (from left to right).
- Apply the operator to the operands (the values of the operands).
return and print介绍
3. Control
- 布尔运算符 and，or，not
- 短路特性 and，or
- if 语句
- while 循环
4. 错误信息
必答题 required questions
what would python display
Q1: WWPD: Control
python ok -q control -u --local
- how_big()，注意
print(' ')和return ' '的引号区别。 while positive,while循环内部修改变量positive，但是positive不为0（负数也是True），无限循环。
Q2: WWPD: Veritasiness
python ok -q short-circuit -u --local
- 理解短路特性较容易
Q3: Debugging Quiz!
python ok -q debugging-quiz -u --local
Coding Practice
Q4: Falling Factorial
python ok -q falling --local
caution：print or return
Q5: Sum Digits
python ok -q sum_digits --local
Hint：floor division and modulo
caution：需要返回值
Extra Practice 额外练习
Q6: WWPD: What If?
python ok -q if-statements -u --local
Hint: print (unlike return) does not cause the function to exit!
caution：print(' ')和return ' '的引号区别
Q7: Double Eights
python3 ok -q if-statements -u --local
相邻的两个8：
return '88' in str(n)
lab01完成
