笨办法学Python3 习题19 函数和变量
定义调用函数：
- 全局变量名和函数变量名避免取相同的名字
- 函数之外的变量不会改变函数中原来的变量，调用函数时会被临时创建，函数运行完就会被丢弃
定义 函数（ 参数变量1，参数变量2）：
函数命令 打印 你有参数变量1的干酪
打印你有 参数变量2的 干酪盒子
打印句子
打印句子1
调用函数（参数值1，参数值2）
打印句子2
赋值变量1，变量2
调用函数 （变量1，变量2）
打印句子3
调用函数 （10+20，5+6）
打印句子4
调用函数（变量1+100，变量2+1000）
1 def cheese_and_crackers(cheese_count, boxes_of_crackers): # 定义函数名，参数1，参数2
2 print(f"You have {cheese_count} cheeses!") # 函数命令打印..参数1...
3 print(f"You have {boxes_of_crackers} boxes of crackers!") # 函数命令打印..参数2...
4 print("Man that's enough for a party!") # 函数命令打印......
5 print("Get a blanket.") # 函数命令打印......
6
7 print("We can just give the function numbers directly:") #打印 字符串
8 cheese_and_crackers(20,30) #调用函数，给参数1，参数2 临时 赋值
9
10 print("OR, we can use variables from our script:") # 打印 字符串
11 amount_of_cheese = 10 # 赋值给变量1
12 amount_of_crackers =50 # 赋值给变量2
13 cheese_and_crackers(amount_of_cheese, amount_of_crackers) # 调用函数，将参数值 临时 改为变量1，变量2
14
15 print("We can even do math inside too:") # 打印字符串
16 cheese_and_crackers(10+20,5+6) # 调用函数，将计算值 临时 赋给参数
17
18 print("And we can combine the two, variables an math:") # 打印字符串
19 cheese_and_crackers(amount_of_cheese+100, amount_of_crackers+1000) # 调用函数，将参数值 临时 改为变量1+100，变量2+1000
PS C:\Users\Administrator\lpthw> 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 an math:
You have 110 cheeses!
You have 1050 boxes of crackers!
Man that's enough for a party!
Get a blanket.
