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