1、使用位置参数
>>> li = ['hoho',18]
>>>print( 'my name is {} ,age {}'.format('hoho',18))
'my name is hoho ,age 18'
位置参数不受顺序约束
>>> 'my name is {1} ,age {0}'.format(10,'hoho')
'my name is hoho ,age 10'
>>> 'my name is {1} ,age {0} {1}'.format(10,'hoho')
'my name is hoho ,age 10 hoho'
传入位置参数列表可用*列表
>>> 'my name is {} ,age {}'.format(*li)
'my name is hoho ,age 18'
2、使用关键字参数
>>> hash = {'name':'hoho','age':18}
>>> 'my name is {name},age is {age}'.format(name='hoho',age=19)
'my name is hoho,age is 19'
可用字典当关键字参数传入值，字典前加**
>>> 'my name is {name},age is {age}'.format(**hash)
'my name is hoho,age is 18'
3、填充与格式化
格式：‘{ 索引:[填充字符][对齐方式][宽度] }’.format()
>>> '{0:*>10}'.format(1) ##右对齐 ,共占10个字符宽度
'********11'
>>> '{:*>10}'.format(3,4,5)
'*********3'
>>> '{:*>10}{:*>10}{:*>10}'.format(3,4,5)
'*********3*********4*********5'
>>> '{0:*<10}'.format(10) ##左对齐
'10********'
>>> '{0:*^10}'.format(10) ##居中对齐
'****10****'
4、精度与进制
>>> '{0:.2f}'.format(1/3) #保留两位小数
'0.33'
>>> '{:,}'.format(12369132698) #千分位格式化
' 12,369,132,698'
>>> '{0:b}'.format(10) #二进制
'1010'
>>> '{0:o}'.format(10) #八进制
'12'
>>> '{0:x}'.format(10) #16进制
'a'
5、使用索引
>>> li =['hoho', 18]
>>> 'name is {0[0]} age is {0[1]}'.format(li) ???????
'name is hoho age is 18
