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本文实例分析了python开发之str.format()用法。分享给大家供大家参考，具体如下：

格式化一个字符串的输出结果，我们在很多地方都可以看到，如：c/c++中都有见过

下面看看python中的字符串格式函数str.format():

? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 #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))

运行效果：

? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 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 >>>

希望本文所述对大家Python程序设计有所帮助。