Detailed introduction to Python string formatting

The string formatting operator (%), which is very similar to the string formatting of the printf () function in C language. It even uses the same symbols and uses the percent sign (% ), it also supports all printf (string formatting operator (%), which is very similar to the string formatting of the printf () function in C language, and even uses the same symbol, with a percent sign (% ), all printf () formatting operations are supported. Syntax:

Format_string % string_to_convert

Format_string is a string in the format of "% cdoe"; string_to_convert is the string to be formatted. if there are more than two strings, they must be enclosed in parentheses.

String formatting symbol

Format symbols	Description
% C	Convert to a character (ASCII value, or a string of the same length)
% S	Converts a string to a string with the str () function prior to string conversion.
% D	Convert to a signed decimal number
% U	Convert to unsigned decimal number
% O	Convert to the unsigned octal number
% X	(Unsigned) to an Unsigned hexadecimal number
% E	Convert to scientific notation
%	Output %
% X	(Unsigned) is converted to an Unsigned hexadecimal number. after conversion, hexadecimal characters are capitalized, which is similar to % e (lowercase after conversion)

Example of string formatting output:

CharA = 65 charB = 66 print ("ASCII code 65 stands for: % c" % charA) print ("ASCII code 66 stands for: % c" % charB) num1 = 0xEF3Num2 = 0xAB03print ('convert to decimal: % u and % u' % (Num1, Num2) Num3 = 1500000 print ('convert to scientific notation: % E' % Num3)

Output:

ASCII code 65:

ASCII code 66: B

Convert to decimal: 3827 and 43779, respectively.

Convert to scientific notation: 1.200000e + 06

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

Auxiliary symbols, as shown in the following table:

Auxiliary symbol	Description
*	Define the width or decimal point precision
-	Align left
+	Displays the plus sign (+) before a positive number)
	A space is displayed before a positive number.
#	Zero (0) is displayed before the octal number, and "0x" or "0X" is displayed before the hexadecimal number (depending on whether "x" or "X" is used ")
0	Fill "0" in front of the displayed number instead of the default space
M. n	Is the minimum total width displayed, and n is the number of digits after the decimal point

Note: The secondary symbol must be between the percent sign (%) and the formatted symbol.

Auxiliary symbol example:

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

Output:

0X6C

234.57

The above is a detailed introduction to Python string formatting. For more information, see other related articles in the first PHP community!