Python format函数详谈

#使用位置进行填充
print(
    'Hello,{0}. My name is {1}. How\'s it going?'.format('Hialry','Vergil')
    #Hello,Hialry. My name is Vergil. How's it going?
)
#若格式中未指定填充位置，将会按序填充
print(
    '{}--{}--{}--{}--{}--{}--{}'.format(1,2,3,4,5,6,7)
    #1--2--3--4--5--6--7
)
 
#使用关键字段进行填充
print(
    'I\'m {name1}, and I miss u so much, {name2}.'.format(name1='vergil',name2='hilary')
    #I'm vergil, and I miss u so much, hilary.
)
 
#使用下标填充
names=['hilary','vergil','nero']
places=['chengdu','shijiazhuang','tokyo']
print(
    'Hi, {names[0]}. I am {names[1]} and this is {names[2]}.'.format(names=names)
    #Hi, hilary. I am vergil and this is nero.
)
print(
    'Three people:{0[0]}, {0[1]}, {0[2]} from three places:{1[0]}, {1[1]}, {1[2]}.'.format(names,places)
    #Three people:hilary, vergil, nero from three places:chengdu, shijiazhuang, tokyo.
)
 
#进制转换
print(
    '{0:b}, {0:o}, {1:d}, {1:x}'.format(256,512)
    #100000000, 400, 512, 200
)
#逗号分隔
print(
    '{:,}'.format(12345678)
    #12,345,678
)
#浮点数格式
print(
    '{:+12.3f}'.format(3.14159265358979)
    #      +3.142
)
#对齐与填充
print(
    '{:>010}'.format(12), #右对齐，宽度10，填充0
    '{:0<+12.3f}'.format(-12.34567),#填充0，左对齐，保留正负号，宽度12，保留3位小数
    '|{:^10}|'.format(3) #，默认填充空格，居中对齐，宽度10
    #0000000012 -12.34600000 |    3     |
)