python开发之str.format()用法实例分析

 #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)) 

 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 >>>