PY4E 课程笔记+练习答案

最新推荐文章于 2025-12-09 16:47:37 发布

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最新推荐文章于 2025-12-09 16:47:37 发布 · 2.6k 阅读

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这篇博客记录了作者在自学Python过程中，按照PY4E课程的学习笔记，包括条件语句、函数、循环与迭代、字符串和文件操作等内容，并提供了相关练习的解答，如工资计算、成绩评级、数值提取等。

条件语句 Conditionals

根据py4e (python for everybody)，记录python自学过程。习题以及语法可以参考以下链接：
py4e-03-conditional execution

Exerecise 3.1

Rewrite your pay computation to give the employee 1.5 times the hourly rate for hours worked above 40 hours.

hrs = input("Enter Hours:")
fh = float(hrs)
rs = input("Enter Rate:")
fr = float(rs)

if fh>40:
    otp = 40 * fr + 1.5 * fr * (fh-40) #otp refers to overtime pay
    print(otp)
else:
    rgp = fr * fh
    print(rgp) # rgp refers to regular pay

Exerecise 3.2
Rewrite your pay program using try and except so that your program handles non-numeric input gracefully by printing a message and exiting the program. The following shows two executions of the program:

Enter Hours: 20
Enter Rate: nine
Error, please enter numeric input

Enter Hours: forty
Error, please enter numeric input

hrs = input("Enter Hours:")
rs = input("Enter Rate:")
try:
    fh = float(hrs)
    fr = float(rs)
except:
    print("Error,please enter numeric input"