python str.format()

python中的字符串格式函数str.format():

 #使用str.format()函数

 #使用'{}'占位符
 print('I\'m {},{}'.format('Hongten','Welcome to my space!'))

 print('#' * 40)

 #也可以使用'{0}','{1}'形式的占位符
 print('{0},I\'m {1},my E-mail is {2}'.format('Hello','Hongten','hongtenzone@foxmail.com'))
 #可以改变占位符的位置
 print('{1},I\'m {0},my E-mail is {2}'.format('Hongten','Hello','hongtenzone@foxmail.com'))

 print('#' * 40)

 #使用'{name}'形式的占位符
 print('Hi,{name},{message}'.format(name = 'Tom',message = 'How old are you?'))

 print('#' * 40)

 #混合使用'{0}','{name}'形式
 print('{0},I\'m {1},{message}'.format('Hello','Hongten',message = 'This is a test message!'))

 print('#' * 40)

 #下面进行格式控制
 import math
 print('The value of PI is approximately {}.'.format(math.pi))
 print('The value of PI is approximately {!r}.'.format(math.pi))
 print('The value of PI is approximately {0:.3f}.'.format(math.pi))

 table = {'Sjoerd': 4127, 'Jack': 4098, 'Dcab': 7678}
 for name, phone in table.items():
     print('{0:10} ==> {1:10d}'.format(name, phone))

 table = {'Sjoerd': 4127, 'Jack': 4098, 'Dcab': 8637678}
 print('Jack: {0[Jack]:d}; Sjoerd: {0[Sjoerd]:d}; ''Dcab: {0[Dcab]:d}'.format(table))

代码

Python 3.3.2 (v3.3.2:d047928ae3f6, May 16 2013, 00:03:43) [MSC v.1600 32 bit (Intel)] on win32
Type "copyright", "credits" or "license()" for more information.
>>> ================================ RESTART ================================
>>>
I'm Hongten,Welcome to my space!
########################################
Hello,I'm Hongten,my E-mail is hongtenzone@foxmail.com
Hello,I'm Hongten,my E-mail is hongtenzone@foxmail.com
########################################
Hi,Tom,How old are you?
########################################
Hello,I'm Hongten,This is a test message!
########################################
The value of PI is approximately 3.141592653589793.
The value of PI is approximately 3.141592653589793.
The value of PI is approximately 3.142.
Jack       ==>       4098
Sjoerd     ==>       4127
Dcab       ==>       7678
Jack: 4098; Sjoerd: 4127; Dcab: 8637678
>>>

运行结果