笨办法学Python（二十一）

    你已经学过使用 = 给变量命名，以及将变量定义为某个数字或者字符串。接下来我们将让你见证更多奇迹。我们要演示给你的是如何使用 = 以及一个新的 Python 词汇return 来将变量设置为“一个函数的值”。有一点你需要及其注意，不过我们暂且不讲，先撰写下面的脚本吧：

 1 def add(a, b):
 2     print "ADDING %d + %d" % (a, b)
 3     return a + b
 4 
 5 def subtract(a, b):
 6     print "SUBTRACTING %d - %d" % (a, b)
 7     return a - b
 8 
 9 def multiply(a, b):
10     print "MULTIPLYING %d * %d" % (a, b)
11     return a * b
12 
13 def divide(a, b):
14     print "DIVIDING %d / %d" % (a, b)
15     return a / b
16 
17 
18 print "Let's do some math with just functions!"
19 
20 age = add(30, 5)
21 height = subtract(78, 4)
22 weight = multiply(90, 2)
23 iq = divide(100, 2)
24 
25 print "Age: %d, Height: %d, Weight: %d, IQ: %d" % (age, height, weight, iq)
26 
27 
28 # A puzzle for the extra credit, type it in anyway.
29 print "Here is a puzzle."
30 
31 what = add(age, subtract(height, multiply(weight, divide(iq, 2))))
32 
33 print "That becomes: ", what, "Can you do it by hand?"

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