用法：
它通过{}和:来代替传统%方式
1、使用位置参数
要点：从以下例子可以看出位置参数不受顺序约束，且可以为{},只要format里有相对应的参数值即可,参数索引从0开，传入位置参数列表可用*列表
1 >>> li = [‘hoho‘,18] 2 >>> ‘my name is {} ,age {}‘.format(‘hoho‘,18) 3 ‘my name is hoho ,age 18‘ 4 >>> ‘my name is {1} ,age {0}‘.format(10,‘hoho‘) 5 ‘my name is hoho ,age 10‘ 6 >>> ‘my name is {1} ,age {0} {1}‘.format(10,‘hoho‘) 7 ‘my name is hoho ,age 10 hoho‘ 8 >>> ‘my name is {} ,age {}‘.format(*li) 9 ‘my name is hoho ,age 18‘
2、使用关键字参数
要点：关键字参数值要对得上，可用字典当关键字参数传入值，字典前加**即可
1 >>> hash = {‘name‘:‘hoho‘,‘age‘:18} 2 >>> ‘my name is {name},age is {age}‘.format(name=‘hoho‘,age=19) 3 ‘my name is hoho,age is 19‘ 4 >>> ‘my name is {name},age is {age}‘.format(**hash) 5 ‘my name is hoho,age is 18‘
3、填充与格式化
:[填充字符][对齐方式 <^>][宽度]
1 >>> ‘{0:*>10}‘.format(10) ##右对齐 2 ‘********10‘ 3 >>> ‘{0:*<10}‘.format(10) ##左对齐 4 ‘10********‘ 5 >>> ‘{0:*^10}‘.format(10) ##居中对齐 6 ‘****10****‘
4、精度与进制
1 >>> ‘{0:.2f}‘.format(1/3) 2 ‘0.33‘ 3 >>> ‘{0:b}‘.format(10) #二进制 4 ‘1010‘ 5 >>> ‘{0:o}‘.format(10) #八进制 6 ‘12‘ 7 >>> ‘{0:x}‘.format(10) #16进制 8 ‘a‘ 9 >>> ‘{:,}‘.format(12369132698) #千分位格式化 10 ‘12,369,132,698‘
5、使用索引
1 >>> li 2 [‘hoho‘, 18] 3 >>> ‘name is {0[0]} age is {0[1]}‘.format(li) 4 ‘name is hoho age is 18