本文實例分析了python開發之str.format()用法。分享給大家供大家參考，具體如下：
格式化一個字符串的輸出結果，我們在很多地方都可以看到，如：c/c++中都有見過
下面看看python中的字符串格式函數str.format():
#使用str.format()函數#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'))#可以改變占位符的位置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)#下面進行格式控制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)) 運行效果：
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>>>
希望本文所述對大家Python程序設計有所幫助。
