《笨办法学Python》 第19课手记

def cheese_and_crackers(cheese_count, boxes_of_crakers): #定义一个函数，括号里面是形参
  print "You have %d cheeses!" % cheese_count #以下为函数主体，请注意print前面的缩进必须保持一致
  print "You have %d boxes of crackers!" % boxes_of_crakers
  print "Man that's enough for a party!"
  print "Get a blanket.n"

print "We can just give the function numbers directly:" #直接将数值作为函数实参
cheese_and_crackers(20, 30) #调用预先定义好的函数

print "OR, we can use variable from our script:" #将数值赋值给变量，再让变量作为函数实参
amount_of_cheese = 10
amount_of_crackers = 50

cheese_and_crackers(amount_of_cheese, amount_of_crackers) #调用预先定义好的函数

print "We can even do math inside too:" #在调用函数时用表达式做函数实参，python会先计算出表达式的值
cheese_and_crackers(10+20, 5+6) #调用预先定义好的函数

print "And we can combine the two, variable and math:" #变量和表达式的混合模式做函数实参
cheese_and_crackers(amount_of_cheese + 100, amount_of_crackers + 1000)