python-day5-格式化输入

python格式化输入包含'%'调用，及format方法

使用‘%’进行格式化输出

 #最简单的字符串传参
 tpl='i am %s '%'alex'
 >>>i am alex 

 #字符串与整数传参
 tpl = 'i am %s age %d'%('alex',18)
 >>>i am alex age 18

 #字典的传参
 tpl = 'i am %(name)s age %(age)d'%{'name':'alex','age':18}
 >>>i am alex age 18

 #浮点型传参
 tpl = 'percent %.2f'%99.97623
 >>>percent 99.98

 #字典中的浮点调用
 tpl = 'i am %(pp).2f'%{'pp':123.42556}
 >>>i am 123.43

 #注意点：表示百分号的时候需要加个%
 tpl = 'i am %.2f %%'%123.425556
 >>>i am 123.43 %

 #错误的方式
 tpl = 'i am %.2f %'%123.425556
 >>>    tpl = 'i am %.2f %'%123.425556
 >>>ValueError: incomplete format

format方法格式化输入

 #format方法顺序对应传参
 tpl = 'i am {},age{},{}'.format('serven',18,'alex')
 >>>i am serven,age18,alex

 #format列表传参*号为将列表分割后顺序传入，不加则会将整个传入而报错
 tpl = 'i am {},age{},{}'.format(*['serven',18,'alex'])
 >>>i am serven,age18,alex

 #format标序传参
 tpl = 'i am {0},age {1},really {0}'.format('serven',18)
 >>>i am serven,age 18,really serven

 #format指定参数名传参
 tpl = 'i am {name},age {age},really {name}'.format(name='seven',age=18)
 >>>i am seven,age 18,really seven

 #format标序后指定下标传参
 tpl = 'i am {0[0]},age{0[1]},really{0[2]}'.format([1,2,3],[11,22,33])
 >>>i am 1,age2,really3

 #对应顺序传参，f整数转为浮点型小数点后保留6位
 tpl = 'i am {:s},age{:d},money {:f}'.format('seven',18,88888.1)
 >>>i am seven,age18,money 88888.100000

 #format 字典传参
 tpl = 'i am {name:s},age{age:d}'.format(**{'name':'seven','age':18})
 >>>i am seven,age18

 #:b转化为2进制，:o转化为8进制：x转化为16进制小写，：X转化为16进制大写:%将值转化为百分比
 tpl = 'numbers : {:b},{:o},{:d},{:x},{:X},{:%}'.format(15,15,15,15,15,15.87623,2)
 >>>numbers : 1111,15,15,f,F,1587.623000%