String: Formatting

The Format method for string formatting

The format method accepts positional parameters and keyword parameters

#位置参数 >>> "{0} love {1}". Format (' I ', ' I ') ' I love you ' #关键字参数 >>> ' {A} love {b} '. Format (a= ' i ', b= ') ' I Love you ' #位置参数和关键词参数可以混用, but the positional parameter must precede the keyword parameter >>> "{0} love {b}". Format (' i ', b= ' i ') ' I Love You ' >>> "{a {0} ". Format (a= ' I ', ' you ') syntaxerror:positional argument follows keyword argument

>>> ' {0:.1f}{1} '. Format (27.658, ' GB ') ' 27.7GB ' #位置参数中加冒号, which means that the beginning of a formatted symbol #.1 means to round up and keep a decimal; F means to print out a fixed-point number # (This part is not understood for the time being)

Second, the string dedicated operator%.

The function of #用法如下 >>> '%c '%100    #%c is to format the character and its Acⅱ code, Acⅱ code in 100 for ' d ' d ' >>> ' I love%s '% ' you '     #实际意思就是把 ' to %s form output ' I love you ' >>> '%s%s '% (' a ', ' B ', ' C ')    #有多个字符串时需要用元组表示 ' a b C ' >>> '%d +%d =%d '% (1,2,1+2)    ' 1 + 2 = 3 '

　　

String formatting symbolic meaning

character Number	say Ming
%c	formatting characters and their ASCII Code
%s	Formatting Strings
%d	formatting integers
%o	formatting an unsigned octal number
%x	formatting unsigned hexadecimal numbers
%x	format unsigned hexadecimal number (uppercase)
%f	format fixed-point number to specify the precision after the decimal point
%e	format with scientific notation fixed-point number
%E	function with %e , formatted with scientific notation fixed-point number
%g	depending on the size of the value, use %f Live %e
%G	function with %g , depending on the size of the value, use %f or %E

Formatting operator Auxiliary directives

character Number	speak clearly
M.N	m is the minimum total width of the display, N is the number of digits after the decimal point
-	use to align left
+	show plus sign (+) in front of positive number
#	display '0o 'before octal number, '0x ' or '0X ' before hexadecimal number
0	The displayed number is preceded by a fill of '0 ' instead of a space

String escape character meaning

character Number	speak clearly
\ '	single quotation marks
\"	Double quotes
\a	issue system ring tones
\b	Backspace
\ n	line break
\ t	Horizontal tab (tab)
\v	Portrait tab
\ r	Carriage return character
\f	page Break
\o	characters represented by octal numbers
\x	The hexadecimal number represents the character
/	represents a null character
\\	back slash

String: Formatting