python中强大的format函数实例详解

#通过位置print '{0},{1}'.format('chuhao',20)print '{},{}'.format('chuhao',20)print '{1},{0},{1}'.format('chuhao',20)#通过关键字参数print '{name},{age}'.format(age=18,name='chuhao')class Person:  def __init__(self,name,age):    self.name = name    self.age = age  def __str__(self):    return 'This guy is {self.name},is {self.age} old'.format(self=self)print str(Person('chuhao',18))#通过映射 lista_list = ['chuhao',20,'china']print 'my name is {0[0]},from {0[2]},age is {0[1]}'.format(a_list)#my name is chuhao,from china,age is 20#通过映射 dictb_dict = {'name':'chuhao','age':20,'province':'shanxi'}print 'my name is {name}, age is {age},from {province}'.format(**b_dict)#my name is chuhao, age is 20,from shanxi#填充与对齐print '{:>8}'.format('189')#   189print '{:0>8}'.format('189')#00000189print '{:a>8}'.format('189')#aaaaa189#精度与类型f#保留两位小数print '{:.2f}'.format(321.33345)#321.33#用来做金额的千位分隔符print '{:,}'.format(1234567890)#1,234,567,890#其他类型 主要就是进制了，b、d、o、x分别是二进制、十进制、八进制、十六进制。print '{:b}'.format(18) #二进制 10010print '{:d}'.format(18) #十进制 18print '{:o}'.format(18) #八进制 22print '{:x}'.format(18) #十六进制12