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():
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#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 mathprint('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：
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Python 3.3.2 (v3.3.2:d047928ae3f6, May 16 2013, 00:03:43) [MSC v.1600 32 bit (Intel)] on win32Type "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.comHello,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 ==> 4098Sjoerd ==> 4127Dcab ==> 7678Jack: 4098; Sjoerd: 4127; Dcab: 8637678>>> |
希望本文所述对大家Python程序设计有所帮助。
