1 #通过位置
 2 print ‘{0},{1}‘.format(‘chuhao‘,20)
 3 
 4 print ‘{},{}‘.format(‘chuhao‘,20)
 5 
 6 print ‘{1},{0},{1}‘.format(‘chuhao‘,20)
 7 
 8 #通过关键字参数
 9 print ‘{name},{age}‘.format(age=18,name=‘chuhao‘)
10 
11 class Person:
12     def __init__(self,name,age):
13         self.name = name
14         self.age = age
15 
16     def __str__(self):
17         return ‘This guy is {self.name},is {self.age} old‘.format(self=self)
18 
19 print str(Person(‘chuhao‘,18))
20 
21 #通过映射 list
22 a_list = [‘chuhao‘,20,‘china‘]
23 print ‘my name is {0[0]},from {0[2]},age is {0[1]}‘.format(a_list)
24 #my name is chuhao,from china,age is 20
25 
26 #通过映射 dict
27 b_dict = {‘name‘:‘chuhao‘,‘age‘:20,‘province‘:‘shanxi‘}
28 print ‘my name is {name}, age is {age},from {province}‘.format(**b_dict)
29 #my name is chuhao, age is 20,from shanxi
30 
31 #填充与对齐
32 print ‘{:>8}‘.format(‘189‘)
33 #     189
34 print ‘{:0>8}‘.format(‘189‘)
35 #00000189
36 print ‘{:a>8}‘.format(‘189‘)
37 #aaaaa189
38 
39 #精度与类型f
40 #保留两位小数
41 print ‘{:.2f}‘.format(321.33345)
42 #321.33
43 
44 #用来做金额的千位分隔符
45 print ‘{:,}‘.format(1234567890)
46 #1,234,567,890
47 
48 #其他类型 主要就是进制了，b、d、o、x分别是二进制、十进制、八进制、十六进制。
49 
50 print ‘{:b}‘.format(18) #二进制 10010
51 print ‘{:d}‘.format(18) #十进制 18
52 print ‘{:o}‘.format(18) #八进制 22
53 print ‘{:x}‘.format(18) #十六进制12