String formatting: How to use % and .format

There are two formatting methods for strings, namely placeholder (%) and format.

The placeholder method is widely used in Python2.x. As Python3.x becomes more and more widely used, the format method is more widely used.

%dExample (Python3.0):

age = 29
print("my age is %d" %age)
#my age is 29

%sExample (Python3.0) :

name = "makes"
print("my name is %s" %name)
#my name is makes

%f Example (Python3.0):

print("%6.3f" % 2.3)
#2.300
print("%f" %2.3)
#2.300000

format() method, the basic format is:

     <模板字符串>.format(<逗号分隔的参数>)

After calling the format() method, a new string will be returned, and the parameters will be numbered starting from 0.

"{}：计算机{}的CPU 占用率为{}%。".format("2016-12-31","PYTHON",10)
Out[10]: '2016-12-31：计算机PYTHON的CPU 占用率为10%。'

The format() method can very conveniently connect different types of variables or content. If you need to output curly brackets, use {{ to represent {, }} to represent }, for example:

"{}{}{}".format("圆周率是",3.1415926,"...")
Out[11]: '圆周率是3.1415926...'
"圆周率{{{1}{2}}}是{0}".format("无理数",3.1415926,"...")
Out[12]: '圆周率{3.1415926...}是无理数'
s="圆周率{{{1}{2}}}是{0}" #大括号本身是字符串的一部分
sOut[14]: '圆周率{{{1}{2}}}是{0}'
s.format("无理数",3.1415926,"...") #当调用format()时解析大括号
Out[15]: '圆周率{3.1415926...}是无理数'

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