《笨办法学Python》 第21课手记

def add(a, b): #定义一个函数，下同，函数的运算分别加、减、乘和除。
  print "ADDING %d + %d" %(a, b)
  return a + b #函数返回a+b的值，下同，对应各自的运算

def subtract(a, b):
  print "SUBTRACTING %d - %d" %(a, b)
  return a - b

def multiply(a, b):
  print "MULTIPLYING %d * %d" %(a, b)
  return a * b

def divide(a, b):
  print "DIVIDING %d / %d" %(a, b)
  return a / b


  print "Let's do some math with just functions!" #使用这些函数

age = add(30, 5)
height = subtract(78 ,4)
weight = multiply(90, 2)
iq = divide(100, 2)

print "Age: %d, Height: %d, weight: %d, IQ: %d" %(age, height, weight, iq)


# A puzzle for the extra credit, type it anyway.
print "Here is a puzzle."

what = add(age, subtract(height, multiply(weight, divide(iq, 2)))) #嵌套函数，4个函数3层嵌套

print "That's becomes:", what, "Can you do it by hand?"#请留心这种输出格式，两个字符串之间加了变量

what = add(age, subtract(height, multiply(weight, divide(iq, 2))))