Python全栈day14（字符串格式化）

一，%字符串格式化

　　1，使用%s 后面一一对应输入对应的字符串，%s可以接受任何参数

print ("I am %s hobby is zhangsan"%'lishi')

print ("I am %s hobby is %s"%('lishi','zhangsan'))

I am lishi hobby is zhangsan
I am lishi hobby is zhangsan

　　2，%d只能接受数字

msg = "I am %s my age is %d"%('lishi',18)
print(msg)

I am lishi my age is 18

　　3，浮点数格式化

tp1 = "percent %f" %99.97623
print(tp1)

percent 99.976230

　　4，默认保留小数点后六位，指定保留位数打印

tp1 = "percent %.2f" %99.97623
print(tp1)

percent 99.98

　　5，如果需要打印%输入两个%即可

tp1 = "percent %.2f%%" %99.97623
print(tp1)

percent 99.98%

　　6，使用键值

tp1 = "I am %(name)s %(age)d" %{"name":"zhangsan","age":18}
print(tp1)

I am zhangsan 18

　　7，可选 + 右对齐 -左对齐（用途少，还可以加颜色）

tp1 = "I am %(name)-30s %(age)d" %{"name":"zhangsan","age":18}
print(tp1)

I am zhangsan                       18

　　9，拼接

print('1','2','3',sep=':')

1:2:3

二，format字符串格式化

　　前面使用{}后面必须一一对应

tp1 = "I am {},age is {}".format('zhangsan',18)
print(tp1)

I am zhangsan,age is 18

　　{}里面加入数字，数字取值为0开始的整数，按照索引取值

tp1 = "I am {1},age is {0}".format('zhangsan',18)
print(tp1)

I am 18,age is zhangsan

　　可以不一一对应但是索引值不能超过索引的位数

tp1 = "I am {1},age is {1}".format('zhangsan',18)
print(tp1)

I am 18,age is 18

　　使用字典形式

tp1 = "I am {name},age is {age}".format(name = 'zhangsan',age = 18)
print(tp1)

I am zhangsan,age is 18

　　也可以使用**接一个字典

tp1 = "I am {name},age is {age}".format(**{'name':'zhangsan',"age":18})
print(tp1)

I am zhangsan,age is 18

　　使用索引

tp1 = "I am {0[0]},age {0[1]},really {0[2]}".format([1,2,3],[11,22,33])
print(tp1)

I am 1,age 2,really 3

　　使用:s :d :f的格式

tp1 = "I am {:s},age {:d},money {:f}".format('zhangsan',18,888888.8)
print(tp1)

I am zhangsan,age 18,money 888888.800000

　　使用*加列表传递（必须要加*号）

tp1 = "I am {:s},age {:d}".format(*['zhansan',18])
print(tp1)

I am zhansan,age 18

　　数字格式b二进制 o八进制 d十进制 x小写16进制 X大写16进制 %转换成百分百默认保留小数后六位

tp1 = "number: {:b},{:o},{:d},{:x},{:X},{:%}".format(15,15,15,15,15,15.87623)
print(tp1)

number: 1111,17,15,f,F,1587.623000%