ex5.md · Joey/Hard Way Learn Python3

## 练习5：更多的变量和打印
现在我们将要处理更多类型的变量，并且将它们打印出来。这一次我们将要用到叫做“格式化字符串”的东西。每当你把“（双引号）放在一段文字的两端，你就标记了一个字符串。
字符串是你的程序想要给人类的东西。你打印字符串、保存字符串到文件、把字符串发送给网络服务器上，或者一些其它的东西。

字符串是很容易使用的，所以在这个练习中，你将会学习到怎样把变量嵌入到字符串中。
为了让变量嵌入到字符串中，你需要使用一个特别的{}符号并且把变量放在{}中。你还需要将你的字符串以 f 开头表示format的意思。

按照惯例，先把下面的代码敲出来。
ex5.py
```
my_name = "Zed A. Shaw"  
my_age= 35 #not a lie  
my_height = 74 #inches  
my_weight = 180 #lbs  
my_eyes = "Blue"  
my_teeth = "White"  
my_hair = "Brown"  
  
print ("Let's talk about %s." % my_name)  
print ("He's %d inches tall." % my_height)  
print ("He's %d pounds heavy." % my_weight)  
print ("Actually that's not too heavy.")  
print ("He's got %s eyes and %s hair." % (my_eyes , my_hair))  
print ("His teeth are usually %s depending on the coffee." % my_teeth)  
  
# this line is tricky , try to get it ecactly riht  
print ("If I add %d , %d , and %d I get %d." % (my_age , my_height , my_weight , my_age + my_height + my_weight))  
  
print ("---------------------------------------------")  
name = "Zed A. Shaw"  
age= 35 #not a lie  
height = 74 #inches  
weight = 180 #lbs  
eyes = "Blue"  
teeth = "White"  
hair = "Brown"  
  
print ("Let's talk about %s." % name)  
print ("He's %d inches tall." % height)  
print ("He's %d pounds heavy." % weight)  
print ("Actually that's not too heavy.")  
print ("He's got %s eyes and %s hair." % (eyes , hair))  
print ("His teeth are usually %s depending on the coffee." % teeth)  
  
# this line is tricky , try to get it ecactly riht  
print ("If I add %d , %d , and %d I get %d." % (age , height , weight , age + height + weight))
```

你将看到一下结果：
```
Let's talk about Zed A. Shaw.  
He's 74 inches tall.  
He's 180 pounds heavy.  
Actually that's not too heavy.  
He's got Blue eyes and Brown hair.  
His teeth are usually White depending on the coffee.  
If I add 35, 74, and 180 I get 289.  
```

#### 加强练习
1:修改所有的变量名字，把它们前面的``my_``去掉。确认将每一个地方的都改掉，不只是你使用``=``赋值过的地方。

2:试着使用更多的格式化字符。例如 %r 就是是非常有用的一个，它的含义是“不管什么都打印出来”。

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