python—字符串格式化

字符串格式化：

    【1】%s：  （%s实际上什么都可以传）

a='I am %s and my hobby is python' %'zy'
print(a)
#运行结果：I am zy and my hobby is python
a='I am %s and my hobby is %s' % ('zy','python')
print(a)
#运行结果：I am zy and my hobby is python
a='I am %s and my hobby is %s' % ('zy',520)    #%s实际上是万能的
print(a)
#运行结果：I am zy and my hobby is 520
a='I am %s and my hobby is %s' % ('zy',[5,2,0])
print(a)
#运行结果：I am zy and my hobby is [5,2,0]

    【2】%d：  （只能传整数）

b='I am %s my hobby is %d' % ('zy',520)
print(b)
#运行结果：I am zy my hobby is 520

　 【3】%f：

c='I have %.2f money' % 100.23456
print(c)
#运行结果:I have 100.23 money

打印百分比：
d='I have %.2f%% money' % 88.8888
print(d)
#运行结果：I have 88.89% money  (自动四舍五入)

     【4】字典传值格式化

e="I am %(name)s age %(age)d" %{"name":"zy","age":18}
print(e)
#运行结果：I am zy age 18

     【5】format字符串格式化

a="I am {},age {},{}".format("seven",20,"zy")
print(a)
#运行结果：I am seven,age 20,zy

b="I am {2},age {1}, {0}".format("seven",18,"zy")      #索引
print(b)
#运行结果：I am zy,age 18, seven

c="I am {1},age {1}".format("seven",18,"zy")
print(c)
#运行结果：I am 18,age 18

d="I am {name}, age {age}, really {name}".format(name="zy",age=20)
print(d)                   #字典
#运行结果：I am zy, age 20, really zy

e="I am {name}, age {age}, really {name}".format(**{"name":"zy","age":18})
print(e)                 #字典必须加两个**来传值
#运行结果：I am zy, age 18, really zy           

f="I am {:s}, age {:d}, money {:f}".format("zy",20,"8888.88")
print(f)
#运行结果：I am zy, age 20, money 8888.880000

g="I am {:s},age {:d}".format(*["zy",20])    #一个*列表传值
print(g)
#运行结果：I am zy,age 20

h="number: {:b},{:o},{:d},{:x},{:X},{:%}".format(15,15,15,15,15,15.66)
print(h)
#运行结果：number: 1111,17,15,f,F,1566.000000%