一、字符串的format方法有几种指定参数的方式：
（1）默认方式—传入的参数与{}一一对应
（2）命名参数
（3）未知参数{2}
二、详细描述字符串的format方法如何格式化字符串：
第一种方法：
s1 = 'Today is {},the temperature is {} degrees.' print(s1.format('Saturday',24))
第二种方法：
s2 = 'Today is {day},the temperature is {degree} degrees.' print(s2.format(degree = 30,day = 'Saturday'))
第三种方法：
s4 = Today is {week},{1},the {0} temperature is {degree} degree.' print(s4.format('abds',1234,degree = 45,week = 'Sunday'))
拓展—如果是对象呢：
class Person: def __init__(self): self.age = 12 self.name - 'Bill' person = Person() s5 = "My name is {p.name},my age is {p.age}." print(s5.format(p = person))