#coding=utf-8
def cheese_and_crackers(cheese_count, boxes_of_crackers):
    print "You have %d cheeses!" % cheese_count
    print "You have %d boxes of crackers!" % boxes_of_crackers
    print "Man that's enough for a party!"
    print "Get a blanket. \n"

print "We can just give the function numbers directly:"
cheese_and_crackers(20, 30)

print "Or,we can use variables from our script:"
amount_of_cheese = 10
amount_of_crackers = 50

cheese_and_crackers(amount_of_cheese, amount_of_crackers)

print "We can even do math inside too:"
cheese_and_crackers(10 + 20, 5 + 6)

print "And we can combine the two, variables and math:"
cheese_and_crackers(amount_of_cheese + 100, amount_of_crackers + 1000)

從代碼上看，這節(jié)課講解了函數(shù)參數(shù)的幾種表達方法，也就是函數(shù)的調(diào)用方法，需要注意的幾個小問題：

• amount_of_cheese和amount_of_crackers這兩個變量會不會改變函數(shù)中的變量?
  不會，這些變量是在函數(shù)之外的，當(dāng)它他們被傳遞到函數(shù)中以后，函數(shù)會為這些變量創(chuàng)建一些臨時的版本，當(dāng)函數(shù)運行結(jié)束后，這些臨時變量就會被丟棄了，一切又回到了之前，但盡量不要讓全局變量與函數(shù)中的變量重名。