Python 数据类型-字符串格式化

数据类型之字符串格式化（字符串拼接）

1.字符串格式化-%用法

例1：打印输出字符串

#!/usr/bin/env python
# -*- coding:utf-8 -*-

msg01="I like %s" %"basketball"
print(msg01)

代码运行结果：

I like basketball

例2：打印输出字符串

#!/usr/bin/env python
# -*- coding:utf-8 -*-

msg01="I like %s and %s" %("basketball","pong")
print(msg01)

代码运行结果：

I like basketball and pong

例3：打印输出整型

#!/usr/bin/env python
# -*- coding:utf-8 -*-
print("I am %d years" %(12))

代码运行结果：

I am 12 years

例4：打印输出浮点数

#!/usr/bin/env python
# -*- coding:utf-8 -*-

print("percent %f" %(99.23680796))

代码运行结果：

percent 99.236808

#!/usr/bin/env python
# -*- coding:utf-8 -*-
#打印输出浮点数，默认保留六位小数；保留1位小数
print("percent %.1f" %(99.23680796))

代码运行结果：

percent 99.2

#!/usr/bin/env python
# -*- coding:utf-8 -*-
#打印输出浮点数，默认保留六位小数；保留2位小数
print("percent %.2f" %(99.23680796))

代码运行结果：

percent 99.24

#!/usr/bin/env python
# -*- coding:utf-8 -*-
#打印输出浮点数，默认保留六位小数；保留2位小数,打印%
print("percent %.2f%%" %(99.23680796))

代码运行结果：

percent 99.24%

2.字符串格式化-format用法

format格式化用法

例1：

#!/usr/bin/env python
# -*- coding:utf-8 -*-

str01="I am {} years,I like to play {},I hard work {}!" .format(12,"basketball","always")
print(str01)

代码运行结果：

I am 12 years,I like to play basketball,I hard work always!

例2：

#!/usr/bin/env python
# -*- coding:utf-8 -*-

str01="I am {2} years,I like to play {0},I hard work {1}!" .format("basketball","always",12)
print(str01)

代码运行结果：

I am 12 years,I like to play basketball,I hard work always!

例3：

#!/usr/bin/env python
# -*- coding:utf-8 -*-
#字符串格式化（字符串拼接）用法:字典形式
str01="I am {age} years,and my brother also is  {age} ,I hard work {fuci}!" .format(fuci="always",age=13)
print(str01)

代码运行结果：

I am 13 years,and my brother also is  13 ,I hard work always!

例4：

#!/usr/bin/env python
# -*- coding:utf-8 -*-
str01="I am {age} years,and my brother also is  {age} ,I hard work {fuci}!" .format(**{"age":12,"fuci":"always"})
print(str01)

代码运行结果：

I am 12 years,and my brother also is  12 ,I hard work always!

例5：

#!/usr/bin/env python
# -*- coding:utf-8 -*-
#字符串格式化（字符串拼接）用法:进制转换
str02="the numbers:{:b},{:d},{:o},{:f}" .format(12,10,16,92.392786613)
print(str02)

代码运行结果：

the numbers:1100,10,20,92.392787