从代码中看其使用方法:
#通过位置 print('{0},{1}'.format('csdn',20)) print ('{},{}'.format('csdn',20)) print ('{1},{0},{1}'.format('csdn',20)) #通过关键字参数 print('{name},{age}'.format(age=18,name='csdn')) 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('csdn',18))) #通过映射 list a_list = ['csdn',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 dict b_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('234')) # 189 print ('{:0>8}'.format('234')) #00000189 print ('{:a>8}'.format('234')) #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 10010)
运行结果:
csdn,20 csdn,20 20,csdn,20 csdn,18 This guy is csdn,is 18 old my name is csdn,from china,age is 20 my name is chuhao, age is 20,from shanxi 234 00000234 aaaaa234 321.33 1,234,567,890 10010