full-speed-python习题解答（一）

项目地址:网页地址

full-speed-python书籍地址：https://github.com/joaoventura/full-speed-python
3.1 Exercises with numbers

---

• 1.Try the following mathematical calculations and guess what is happening: (3/2),(3//2), (3%2), (3**2).

    print(3/2)
    print(3//2)
    print(3%2)
    print(3**2)
  

• 1.5
  1
  1
  9
  

---

• 2.Calculate the average of the following sequences of numbers: (2, 4), (4, 8, 9), (12,14/6, 15)

    a = [2,4]+[4,8,9]+[12,14/6,15]
    sum = 0
    for each in a:
        sum+=each
    ave = sum/len(a)
    ave
  

• 7.041666666666667
  

---

• 3.The volume of a sphere is given by 4/3πr^3. Calculate the volume of a sphere of radius 5. Suggestion: create a variable named “pi” with the value of 3.1415

    pi = 3.1415
    r = 5
    volume =4/3*(pi*pow(r,3))
    volume
  

• 523.5833333333333
  

---

• 4.Use the module operator (%) to check which of the following numbers is even or odd: (1, 5, 20, 60/7).

    can = [1,5,20,60/7]
    for each in can:
        if each % 2 == 0:
            print(each,' is even')
        else:
            print(each,' is odd')
  

• 1  is odd
  5  is odd
  20  is even
  8.571428571428571  is odd
  

---

• 5.Find some values for x and y such that x < 1/3 < y returns “True” on the Python REPL. Suggestion: try 0 < 1/3 < 1 on the REPL.

    0<1/3<1
  

• True
  

参考链接：网页链接