day 14 字符串格式化

%s ,传递任何参数,例如:字符串,数字,列表等:

name = "my name is %s age is %s."%('hsf',29)
print(name)

%d: 只能传递数字参数

 

%f :传递浮点数(默认保留小数点后6位,可以指定保留位数)

 

num = ('percent %f'%(3.1415926))
print(num)   #输出===>percent 3.141593

num1 = ('percent %.2f'%(3.1415926))  #指定保留两位
print(num1)   #输出===>percent 3.14

 

浮点数打印%

 

 

num = ('percent %f%%'%(3.1415926))
print(num)   #输出===>percent 3.141593%

 

通过键来传递参数:

name = "my name is %(name)s age is %(age)s."% {"name":"hsf","age":29}
print(name)   #输出===>my name is hsf age is 29.

 

format字符串格式化

常用格式化:

1 . 通过位置传参:

name = "my name is {} , age is {} ,my dog name is {}".format("hsf",29,"ez")
print(name)

2.通过下标方式传参:

name = "my name is {1} , age is {0} ,my dog name is {2}".format("hsf",29,"ez")
print(name)

3.以字典的形式传参:format(**())

name = "my name is {name} , age is {age} ,my dog name is {dog}".format(name = "hsf",age=29,dog = "ez")
print(name)   #输出===>my name is hsf , age is 29 ,my dog name is ez

name = "my name is {name} , age is {age} ,my dog name is {dog}".format(**{"name":"hsf","age":29,"dog":"ez"})
print(name)   #输出===>my name is hsf , age is 29 ,my dog name is ez

 4.通过索引的元组方式传参:

name = "my name is {0[1]} , age is {0[2]} ,my dog name is {1[1]}".format([1,2,3],[4,5,6])
print(name)   #输出===>my name is 2 , age is 3 ,my dog name is 5

5. 列表的形式传参:format(*()) 

6.多种形式传参:

---:b>>>以二进制形式传入

---:o>>>以八进制形式传入

---:d>>>以整型的形式传入

---:x>>>以十六进制形式传入(小写的十六进制)

---X>>>以十六进制形式传入(大写的十六进制)

---:%>>>打印百分比

numbers = "numbers:{:b},{:o},{:d},{:x},{:X},{:%}".format(15,15,15,15,15,15.87623)
print(numbers)   输出===>numbers:1111,17,15,f,F,1587.623000%