What does the python percent sign mean?

Two common ones

The first one: numerical operation 1 % 3 refers to the modular operation, taking the remainder (remainder)

>>> 7%2
1

The second Type: String operation 'abc %s' % 'abc' '%s' is similar to the placeholder result of this line of code

The following is the type code
%s String (using str() Display)
%r String (display using repr())
%c Single character
%b Binary integer
%d Decimal integer
%i Decimal integer
%o Octal integer
%x Hexadecimal integer
%e Exponent (the base is written as e)
%E Exponent (the base is written as E)
%f Floating point number
%F Floating point number , the same as above %g Exponent (e) or floating point number (according to the display length)
%G Exponent (E) or floating point number (according to the display length)
%% Character "%"

Example

>>> print("%6.3f" % 2.3)
 2.300

The content after the first "%" is the display format description, 6 is the display width, 3 is the number of decimal points, f is the floating point number type
The content after the second "%" is The source of the displayed content, the output result is right-aligned, the length of 2.300 is 5, so there is a space in front

Simply put, this is an operation of placing other variables into a specific position of the string to generate a new string. For example:

n = "Aki"
"My name is %s" % n

这段代码首先定义了一个名为n的变量，内容为Aki。然后下方的字符串中有一个%s，他的含义是“这里将被替换成一个新的字符串”，用作替换的内容放在字符串后面的%后面，就是那个n。所以最终这个字符串会变成My name is Aki。

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