你可以用字符串的format方法来格式化输出字符串。 比如；
>>>
print 'We are the {0} who say "{1}!"'.format('knights',
'Ni')
We are
the knights
who say "Ni!"
print 'We are the {0} who say "{1}!"'.format('knights',
'Ni')
We are
the knights
who say "Ni!"
括号内的字符（称为格式字段）被替换的对象。{}括号中的数字是指替换的位置，里面的数字，比如0,1表示替换元组的索引位置。
>>>
print '{0} and {1}'.format('spam',
'eggs')
spam and
eggs
>>>
print '{1} and {0}'.format('spam',
'eggs')
eggs and
spam
print '{0} and {1}'.format('spam',
'eggs')
spam and
eggs
>>>
print '{1} and {0}'.format('spam',
'eggs')
eggs and
spam
如果使用关键字参数的格式方法，其值被称为使用的参数名称。
>>>
print 'This {food} is {adjective}.'.format(
... food='spam',
adjective='absolutely horrible')
This spam
is absolutely
horrible.
print 'This {food} is {adjective}.'.format(
... food='spam',
adjective='absolutely horrible')
This spam
is absolutely
horrible.
下面是位置和关键字参数的任意组合：
>>>
print 'The story of {0}, {1}, and {other}.'.format('Bill',
'Manfred',
... other='Georg')
The story
of Bill,
Manfred,
and Georg.
print 'The story of {0}, {1}, and {other}.'.format('Bill',
'Manfred',
... other='Georg')
The story
of Bill,
Manfred,
and Georg.