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
>>> li = [\'hoho\',18]
>>> \'my name is {} ,age {}\'.format(\'hoho\',18)
\'my name is hoho ,age 18\'
>>> \'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\'
>>> \'my name is {} ,age {}\'.format(*li)
\'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
>>> hash = {\'name\':\'hoho\',\'age\':18}
>>> \'my name is {name},age is {age}\'.format(name=\'hoho\',age=19)
\'my name is hoho,age is 19\'
>>> \'my name is {name},age is {age}\'.format(**hash)
\'my name is hoho,age is 18\'
3、填充与格式化
:[填充字符][对齐方式 <^>][宽度]
>>> \'{0:*>10}\'.format(10) ##右对齐
\'********10\'
>>> \'{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)
\'0.33\'
>>> \'{0:b}\'.format(10) #二进制
\'1010\'
>>> \'{0:o}\'.format(10) #八进制
\'12\'
>>> \'{0:x}\'.format(10) #16进制
\'a\'
>>> \'{:,}\'.format(12369132698) #千分位格式化
\'12,369,132,698\'
5、使用索引
>>> li
[\'hoho\', 18]
>>> \'name is {0[0]} age is {0[1]}\'.format(li)
\'name is hoho age is 18