Python中的函數與變量有什么用

這篇文章主要介紹Python中的函數與變量有什么用，文中介紹的非常詳細，具有一定的參考價值，感興趣的小伙伴們一定要看完！

首先大家先來看一看這個代碼演示，理解下Python中的函數與變量的關系：

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)

通過這個案例，我們可以發現函數 cheese_and_crackers 傳遞很多的參數，然后在函數里把它們打印出來。我們可以在函數里用變量名，可以在函數里做運算，甚至可以將變量和運算結合起來。從一方面來說，函數的參數和我們的生成變量時用的 = 賦值符類似。事實上，如果你可以用 = 給一個東西命名，你也就可以將其作為參數傳遞給一個函數。

下面我們再來看看剛剛編寫的代碼的終端輸出結果：

$ 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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