Python中的函数与变量有什么用

这篇文章主要介绍Python中的函数与变量有什么用，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！

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首先大家先来看一看这个代码演示，理解下Python中的函数与变量的关系：

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)

通过这个案例，我们可以发现函数 cheese_and_crackers传递很多的参数，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，可以在函数里做运算，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，如果你可以用 =给一个东西命名，你也就可以将其作为参数传递给一个函数。

下面我们再来看看刚刚编写的代码的终端输出结果：

$ 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.

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