python—字符串格式化

字符串格式化：

【1】%s：（%s实际上什么都可以传）

 1 a='I am %s and my hobby is python' %'zy'
 2 print(a)
 3 #运行结果：I am zy and my hobby is python
 4 a='I am %s and my hobby is %s' % ('zy','python')
 5 print(a)
 6 #运行结果：I am zy and my hobby is python
 7 a='I am %s and my hobby is %s' % ('zy',520)    #%s实际上是万能的
 8 print(a)
 9 #运行结果：I am zy and my hobby is 520
10 a='I am %s and my hobby is %s' % ('zy',[5,2,0])
11 print(a)
12 #运行结果：I am zy and my hobby is [5,2,0]

【2】%d：（只能传整数）

1 b='I am %s my hobby is %d' % ('zy',520)
2 print(b)
3 #运行结果：I am zy my hobby is 520

　【3】%f：

1 c='I have %.2f money' % 100.23456
2 print(c)
3 #运行结果:I have 100.23 money

1 打印百分比：
2 d='I have %.2f%% money' % 88.8888
3 print(d)
4 #运行结果：I have 88.89% money  (自动四舍五入)

【4】字典传值格式化

1 e="I am %(name)s age %(age)d" %{"name":"zy","age":18}
2 print(e)
3 #运行结果：I am zy age 18

【5】format字符串格式化

 1 a="I am {},age {},{}".format("seven",20,"zy")
 2 print(a)
 3 #运行结果：I am seven,age 20,zy
 4 
 5 b="I am {2},age {1}, {0}".format("seven",18,"zy")      #索引
 6 print(b)
 7 #运行结果：I am zy,age 18, seven
 8 
 9 c="I am {1},age {1}".format("seven",18,"zy")
10 print(c)
11 #运行结果：I am 18,age 18
12 
13 d="I am {name}, age {age}, really {name}".format(name="zy",age=20)
14 print(d)                   #字典
15 #运行结果：I am zy, age 20, really zy
16 
17 e="I am {name}, age {age}, really {name}".format(**{"name":"zy","age":18})
18 print(e)                 #字典必须加两个**来传值
19 #运行结果：I am zy, age 18, really zy           
20 
21 f="I am {:s}, age {:d}, money {:f}".format("zy",20,"8888.88")
22 print(f)
23 #运行结果：I am zy, age 20, money 8888.880000
24 
25 g="I am {:s},age {:d}".format(*["zy",20])    #一个*列表传值
26 print(g)
27 #运行结果：I am zy,age 20
28 
29 h="number: {:b},{:o},{:d},{:x},{:X},{:%}".format(15,15,15,15,15,15.66)
30 print(h)
31 #运行结果：number: 1111,17,15,f,F,1566.000000%