Detailed introduction to Python string formatting

StringFormattingOperator(%), very similar to the characters of printf()function in C language String formatting even uses the same symbols, using the percent sign (%), and supports all printf()-style formatting operations. The syntax is as follows:

format_string % string_to_convert

format_string is the format mark string, in the form of "%cdoe"; string_to_convert is the desired format If there are more than two strings, they need to be enclosed in parentheses.

String formatting symbols

##%eConvert to scientific notation%%Output%##%XString

Formatting symbols	Description
%c	Convert to characters (ASCII code value, or a string of length one)
%s	To convert into a string, first use the str() function to convert the string
%d	into a signed decimal number
%u	Convert to unsigned decimal number
%o	Convert to unsigned octal number
%x	(Unsigned) Convert to unsigned hexadecimal number
(Unsigned) is converted into an unsigned hexadecimal number , hexadecimal characters are uppercase after conversion, similar to %e (lowercase after conversion)

Formatted output

Example:

charA = 65
charB = 66
print("ASCII码65代表：%c" % charA)
print("ASCII码66代表：%c" % charB)
Num1 = 0xEF3
Num2 = 0xAB03
print('转换成十进制分别为：%u和%u' % (Num1, Num2))
Num3 = 1500000
print('转换成科学计数法为：%e' % Num3)

Output:

ASCII code 65 represents: A

ASCII code 66 represents: B

converted to decimal are: 3827 and 43779

converted to The scientific notation is: 1.200000e+06

The formatting characters can also be used with auxiliary symbols, which is very convenient.

Auxiliary symbols, as shown in the following table:

Auxiliary symbols*- +0m.n

Description
Define width or decimal point precision
Use for left alignment
Display a plus sign (+) before a positive number
Display a space before a positive number
#Displays zero (0) in front of octal numbers, and displays "0x" or "0X" in front of hexadecimal numbers (depending on whether "x" or "X" is used ")
The displayed number is filled with "0" instead of the default space
is the minimum total width of the display, n is the number of digits after the decimal point

Note: Auxiliary symbols must be between the percent sign (%) and formatting between symbols.

Auxiliary symbol example:

Num1 = 108
print("%#X" % Num1)
Num2 = 234.567890
print("%.2f" % Num2)

Output:

0X6C

234.57

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