python中的字符串格式函数str.format()

8410阅读 0评论2014-09-17 大方无隅
分类:Python/Ruby

1 #使用str.format()函数  
2  
3 #使用'{}'占位符  
4 print('I\'m {},{}'.format('Hongten','Welcome to my space!'))  
5 >>> I'm Hongten,Welcome to my space!  
6 print('#' * 40)  
7  
8 #也可以使用'{0}','{1}'形式的占位符  
9 print('{0},I\'m {1},my E-mail is {2}'.format('Hello','Hongten','hongtenzone@foxmail.com')) 

>>> Hello,I'm Hongten,my E-mail is hongtenzone@foxmail.com

10 #可以改变占位符的位置 
11 print('{1},I\'m {0},my E-mail is {2}'.format('Hongten','Hello','hongtenzone@foxmail.com')) 
12 >>> Hello,I'm Hongten,my E-mail is hongtenzone@foxmail.com
13 print('#' * 40
14 ########################################
15 #使用'{name}'形式的占位符 
16 print('Hi,{name},{message}'.format(name = 'Tom',message = 'How old are you?')) 
17 >>> Hi,Tom,How old are you?
18 print('#' * 40
19 ########################################
20 #混合使用'{0}','{name}'形式 
21 print('{0},I\'m {1},{message}'.format('Hello','Hongten',message = 'This is a test message!')) 
22 >>> Hello,I'm Hongten,This is a test message!
23 print('#' * 40
24 ########################################
25 #下面进行格式控制 
26 import math 
27 print('The value of PI is approximately {}.'.format(math.pi)) 

>>> The value of PI is approximately 3.141592653589793.
28 print('The value of PI is approximately {!r}.'.format(math.pi)) 

>>> The value of PI is approximately 3.141592653589793.
29 print('The value of PI is approximately {0:.3f}.'.format(math.pi)) 
>>> The value of PI is approximately 3.142.
30
31 
32 table = {'Sjoerd': 4127, 'Jack': 4098, 'Dcab': 7678
33 for name, phone in table.items(): 
34 print('{0:10} ==> {1:10d}'.format(name, phone)) 
35 >>> 
Dcab   ==>       7678
Jack   ==>       4098
Sjoerd ==>       4127
36 
37 table = {'Sjoerd': 4127, 'Jack': 4098, 'Dcab': 8637678
38 print('Jack: {0[Jack]:d}; Sjoerd: {0[Sjoerd]:d}; ''Dcab: {0[Dcab]:d}'.format(table))
>>> Jack: 4098; Sjoerd: 4127; Dcab: 8637678
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