Python--8 formatting

Replacement

Position parameters

>>> ' {0} love {1}. {2} '. Format (' I ', ' junjie ', ' com ')
' I Love junjie.com '

Keyword parameters

>>> ' {A} love {b}. {c} '. Format (a= ' I ', b= ' Junjie ', c= ' com ')
' I Love junjie.com '

Positional parameters plus keyword parameter positional parameters must precede the keyword argument

>>> ' {0} love {b}. {c} '. Format (' I ', b= ' Junjie ', c= ' com ')
' I Love junjie.com '

>>> ' {A} love {b}. {0} '. Format (a= ' I ', b= ' junjie ', ' com ')
syntaxerror:positional argument follows keyword argument

Printing brackets

>>> ' {{0}} '. Format (' Do not print ')
' {0} '

Formatting symbols

>>> ' {0:.1f}{1} '. Format (27.68, ' GB '): Represents the beginning of a formatted symbol in a replacement field. 1 Rounding retain one decimal place f fixed number
' 27.7GB '

String formatting symbolic meaning

Symbol	Description
%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 floating-point numbers to specify the precision after a decimal point
%e	Format floating-point numbers with scientific notation
%E	function with%e, format floating-point numbers with scientific notation
%g	Use%f or%e depending on the size of the value
%G	function with%g, depending on the size of the value, use%f or%E

Formatting operator Auxiliary commands

Symbol	Description
M.n	M is the smallest total width displayed, and n is the number of digits after the decimal point
-	Use to align Left
+	Display a plus sign before a 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

Python's escape character and its meaning

Symbol	Description
\‘	Single quotation marks
\"	Double quotes
\a	Issue System ring tones
\b	Backspace
\ n	Line break
\ t

Python--8 formatting