• 1 .格式化時不用關心資料型別的問題，format()會自動轉換，而在%方法中，%s用來格式化字串型別，%d用來格式化整型;
• 2. 單個引數可以多次輸出，引數順序可以不同
• 3. 填充方式靈活，對齊方式強大

1. 通過位置來填充字串

>>> '{0}, {1}, {2}'.format('a', 'b', 'c')
'a, b, c'
>>> '{2}, {1}, {0}'.format('a', 'b', 'c')
'c, b, a'
>>> '{0}{1}{0}'.format('a', 'b')
'aba'
 

2. 通過key來填充字串

>>> print 'hello {name1}  i am {name2}'.format(name1='Kevin',name2='Tom')
hello Kevin i am Tom

3. 通過下標來填充字串

>>> names=['Kevin','Tom']
>>> print 'hello {names[0]}  i am {names[1]}'.format(names=names) 
>>> print 'hello {0[0]}  i am {0[1]}'.format(names)
hello Kevin i am Tom
 

4. 通過屬性匹配來填充字串

>>> class Point:
...     def __init__(self, x, y):
...         self.x, self.y = x, y
...     def __str__(self):
...         return 'Point({self.x}, {self.y})'.format(self=self)
...
>>> str(Point(4, 2))
'Point(4, 2)'

>>> names={'name':'Kevin','name2':'Tom'}
>>> print 'hello {names[name]}  i am {names[name2]}'.format(names=names)
hello Kevin i am Tom
 

>>> '{:,}'.format(1234567890)
'1,234,567,890'

>>> points = 19
>>> total = 22
>>> 'Correct answers: {:.2%}'.format(points/total)
'Correct answers: 86.36%'

>>>'{:.2f}'.format(3.1415926)
3.14
>>> '{:.0f}'.format(3.1415926)
3