What does python formatted output mean?

We often output something like 'Dear xxx Hello! Your phone bill for xx months is xx, and the balance is a string like xx', and the content of xxx changes based on variables, so a simple way to format strings is needed. Formatted output can help you achieve this function.

Method 1: (%s)

In In Python, the % operator is used to format strings. Within the string, %s means replacing with a string, %d means replacing with an integer, there are several %? placeholders, followed by several variables or values, and the order must be corresponding.

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If there is only one %?, the brackets can be omitted.

When passed to the %s method in Python, it can also be regarded as a function parameter in the shell.

name = input('请输入名字：')
age = input('请输入年龄：')
job = input('请输入职业：')
hobbie = input('请输入爱好：')
msg = '''------------ info of %s -----------
Name  : %s
Age   : %d
job   : %s
Hobbie: %s
------------- end -----------------''' % (name, name, int(age), job, hobbie)print(msg)

Sometimes, what should I do if the % in the string is an ordinary character? At this time, you need to escape, use %% to represent a %

print('我叫%s,今年%d,学习进度2%%' % ('李起光', 10000))

If you are not sure what to use, %s will always work, it will convert any data type to a string:

name = input('请输入名字：')
age = input('请输入年龄：')
job = input('请输入职业：')
hobbie = input('请输入爱好：')
msg = '''------------ info of %s -----------
Name  : %s
Age   : %s
job   : %s
Hobbie: %s
------------- end -----------------''' % (name, name, int(age), job, hobbie)print(msg)

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Method 2: (format Function)

The format function also implements formatted output through substitution. It has three usages as follows:

Usage 1:

is the same as the % mentioned above s is similar, the difference is that %s is replaced by '{ }' curly brackets, and the order still needs to be corresponded when calling.

s = "我叫{}，今年{}，爱好{}"
s1= s.format('抠脚大汉', '25', '女')

Usage 2:

Use the {n} method to specify the location of the received parameters, and pass the parameters passed in during the call according to the location. Compared with %s, it can reduce the number of parameters and realize parameter reuse.

s= "我叫{0}，今年{1}，爱好{2},我依然叫{0}"
s1= s.format('抠脚大汉', '25', '女')

Usage 3:

Specify the name through {str}, use str='xxx' when calling, and make sure the parameters are passed in.

s = "我叫{name}，今年{age}，爱好{hobby}"
s1= s.format(age=25,hobby='girl',name='抠脚大汉')

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