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函数这个概念也许承载了太多的信息量，不过别担心。只要坚持做这些练习，对照上个练习中的检查点检查一遍这次的联系，你最终会明白这些内容的。
有一个你可能没有注意到的细节，我们现在强调一下：函数里边的变量和脚本里边的变量之间是没有连接的。下面的这个练习可以让你对这一点有更多的思考：
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)
通过这个练习，你看到我们给我们的函数 cheese_and_crackers 很多的参数，然后在函数里把它们打印出来。我们可以在函数里用变量名，我们可以在函数里做运算ASP 变量，我们甚至可以将变量和运算结合起来。
从一方面来说，函数的参数和我们的生成变量时用的 = 赋值符类似。事实上，如果一个物件你可以用 = 将其命名，你通常也可以将其作为参数传递给一个函数。
你应该看到的结果
你应该研究一下脚本的输出，和你想象的结果对比一下看有什么不同。
$ python ex19.py
We can just give the function numbers directly:
You have 20 cheeses!
You have 30 boxes of crackers!
Man that's enough for a party!
Get a blanket.
OR, we can use variables from our script:
You have 10 cheeses!
You have 50 boxes of crackers!
Man that's enough for a party!
Get a blanket.
We can even do math inside too:
You have 30 cheeses!
You have 11 boxes of crackers!
Man that's enough for a party!
Get a blanket.
And we can combine the two, variables and math:
You have 110 cheeses!
You have 1050 boxes of crackers!
Man that's enough for a party!
Get a blanket.
$
【Python3的代码：
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_crakers = 50
cheese_and_crackers (amount_of_cheese, amount_of_crakers)
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_crakers + 1000)
输出结果为：
We can just give the function numbers directly:
You have 20 cheeses!
You have 30 boxes of crackers!
Man that's enough for a party!
Get a blanket.
OR, we can use variables from our script:
You have 10 cheeses!
You have 50 boxes of crackers!
Man that's enough for a party!
Get a blanket.
We can even do math inside too:
You have 30 cheeses!
You have 11 boxes of crackers!
Man that's enough for a party!
Get a blanket.
And we can combine the two, variables and math:
You have 110 cheeses!
You have 1050 boxes of crackers!
Man that's enough for a party!
Get a blanket.
】
加分习题
1. 倒着将脚本读完，在每一行上面添加一行注解，说明这行的作用。
2. 从最后一行开始，倒着阅读每一行，读出所有的重要字符来。
3. 自己编至少一个函数出来，然后用10种方法运行这个函数。
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