笨办法学python习题19 函数和变量_笨方法学python ex19-优快云博客

本文通过实例介绍了Python中函数参数的不同传递方式，包括直接传递数字、使用变量、进行数学运算及混合使用变量和数学表达式等。同时强调了函数内部变量与外部脚本变量之间的独立性。

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这次的习题主要探讨的是函数的参数部分可有有哪些组成方式。另外强调的是：函数里的变量和脚本里的变量之间是没有联系的。

代码如下：

#-*-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"
	
#函数参数为数字	
print"We can just give the function numbers directly:"
cheese_and_crackers(20,30)

#函数参数为变量
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)

#函数参数为数学表达式
print"We can even do math inside too:"
cheese_and_crackers(10+20,5+6)

#函数参数为变量、数字、数学表达式
print"And we can combine the two,variables and math:"
cheese_and_crackers(amount_of_cheese+100, amount_of_crackers+1000)

运行结果如下：

simengred$ 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.

1,从代码和运行结果来看，函数中的变量可以是数字、变量、数学表达式甚至是变量和数学表达式和变量组合使用。

2,如果函数参数中的变量和脚本里面的变量命名完全相同，程序运行也是没有问题的。但是应当尽量避免，以免引起不必要的混淆。

例如：

#-*-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"
	
#函数参数为数字	
print"We can just give the function numbers directly:"
cheese_and_crackers(20,30)

#函数参数为变量
print"OR, we can use variables from our script:"
cheese_count = 10
amount_of_crackers = 50

cheese_and_crackers(cheese_count,amount_of_crackers)

#函数参数为数学表达式
print"We can even do math inside too:"
cheese_and_crackers(10+20,5+6)

#函数参数为变量、数字、数学表达式
print"And we can combine the two,variables and math:"
cheese_and_crackers(cheese_count+100, amount_of_crackers+1000)