Python format函数输出格式详解

#通过位置
print ('{0},{1}'.format('chuhao',20))
print ('{},{}'.format('chuhao',20))
print ('{1},{2},{2}'.format('chuhao',20,3))
#通过关键字参数
print ('{name},{age}'.format(age=18,name='chuhao'))
class Person:
#重置__init__函数
    def __init__(self,name,age):
        self.name = name
        self.age = age
# 重置__str__函数
    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 list
a_list = ['chuhao',20,'china']
print ('my name is {0[0]},from {0[2]},age is {0[1]}'.format(a_list))
a_list+=['aaa',34,'bbb']
print(a_list)
print ('my name is {0[2]},from {0[3]},age is {0[4]}'.format(a_list))
#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))
#填充与对齐
print ('{:>8}'.format('189'))
print ('{:0>8}'.format('189'))
print ('{:a>8}'.format('189'))
#精度与类型f
#保留两位小数
print ('{:.2f}'.format(321.33345))
#用来做金额的千位分隔符
print ('{:,}'.format(1234567890))
#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
print ('{:d}'.format(18)) #十进制 18
print ('{:o}'.format(18)) #八进制 22
print ('{:x}'.format(18)) #十六进制12

本文转至：https://blog.csdn.net/jiaoct7703/article/details/79562635