Python output format and function format

This paper summarizes some simple and basic forms of output formatting and the basic usage form of the function Format function.

String Formatting code:

format	Description
%%	Percent Sign
%c	Characters and their ASCII code
%s	String
%d	Signed integer (decimal)
%u	unsigned integer (decimal)
%o	unsigned integer (octal)
%x	unsigned integer (hexadecimal)
%x	unsigned integer (16 uppercase characters)
%e	Floating-point numbers (scientific notation)
%E	Floating-point numbers (scientific notation, E instead of e)
%f	Floating point number (with decimal point symbol)
%g	Floating-point numbers (%e or%f depending on the size of the value)
%G	Floating-point numbers (similar to%g)
%p	Pointer (memory address of the value printed in hexadecimal)
%n	Stores the number of output characters into the next variable in the parameter list

Use of basic methods:

 1 #!/usr/bin/python 2 #coding =utf-8 3 "4 You can specify the alignment of the desired length of the string: 5 < (default) left-justified 6 > right-aligned 7 ^ middle-aligned 8 = (for numbers only) after the decimal point 9 "' Print (' 1:\t|{ 0:&GT;10}, '. Format (' Wangyu ') print (' 2:\t|{ 0:4.2f} '. Format (1.1415926)) print (' 3:\t| ', Format (1.1415926, ' <10.2f ')) print (' 4:\t|{ 0:&LT;10},{1:&LT;15} '. Format (' Wangyu ', 1.1415926)) print (' 5:\t| User ID: {uid} last seen: {last_login} '. Format (uid= ' root ', Last_login = ' 5 Mar 2008 07:20 ')) 15 16 "The format indicator can contain a presentation type to control formatting 。 17 For example, a floating-point number can be formatted as a general format or represented by a power. ' B '-binary. The number is output as a base of 2. The ' C '-character. Converts an integer to the corresponding Unicode string before printing. The ' d '-decimal integer. The number is output as a base of 10. Eight ' o '-binary. The number is output as a base of 8. 16 ' x '-binary. The number is output in 16, and the number of digits above 9 is in lowercase letters. The ' e '-power symbol. Print numbers in scientific notation. Use ' e ' to indicate power. ' G '-general format. The value is output in fixed-point format. When the number is particularly large, it is printed in a power form. ' N '-number. When the value is an integer and ' d ', the values are the same as the ' G ' when they are floating-point numbers. The difference is that it inserts a numeric delimiter according to the locale. 26 '% '-percent. Multiply the value by 100 and then print in fixed-point (' F ') format, followed by a percent semicolon. "" "Print (' 6:\t|{ 0:B} '. Format (3))-Print (' 7:\t|{ 0:C} '. Format (3)) to print (' 8:\t|{ 0:D} '. Format (3)) print (' 9:\t|{ 0:o} '. Format (3)) print(' 10:\t| {0:x} '. Format (3) "Print (' 11:\t|{ 0:E} '. Format (3.75)) print (' 12:\t|{ 0:G} '. Format (3.75))-Print (' 13:\t|{ 0:N} '. Format (3.75)) #浮点数37 print (' 14:\t|{ 0:N} '. Format (3) #整数38 print (' 15:\t|{ 0:%} '. Format (3.75)) #输入形式的控制format41 a = Int (input (' A: '))--B = int (input (' B: ')) print (' 16:\t|%*.*f '% (A, B, 1.14 15926)) (' 17:\t|{ ARRAY[2]} '. Format (Array=range ()) "Print (' 18:\t|{ ATTR.__CLASS__} '. Format (attr=0)) print (' 19:\t|{ digit:*^ 10.5f} '. Format (DIGIT=1.0/3)) 48 49 "50 classes and types can define a __format__ () method to control how to format themselves. 51 it accepts a format indicator as a parameter: "__format__" (Self, Format_spec): si if Isinstance (Format_spec, Unicode): retur n Unicode (self), else:57 return str (self)

#!/usr/bin/python#coding=utf-8# use the ' {} ' placeholder print (' I\ ' m {},{} ') using the Str.format () function #. Format (' Hongten ', ' Welcome to my space! ') Print (' # ') #也可以使用 ' {0} ', ' {1} ' placeholder print (' {0},i\ ' m {1},my e-mail is {2} '. Format (' Hello ', ' hongten ', ' [email  Protected]) #可以改变占位符的位置print (' {1},i\ ' m {0},my e-mail is {2} '. Format (' Hongten ', ' Hello ', ' [email protected] ')) Print (' # ') #使用 placeholder print (' Hi,{name},{message} ' in the form of ' {name} '. Format (name = ' Tom ', message = ' How old is You? ')) Print (' # ') #混合使用 ' {0} ', ' {name} ' form print (' {0},i\ ' m {1},{message} '. Format (' Hello ', ' hongten ', message = ' This is a test message! ')) Print (' # ') #下面进行格式控制import mathprint (' The value of PI is approximately {}. '). Format (Math.PI)) print (' The value of pi is approximately {!r} '. Format (Math.PI)) print (' The value of pi is approximately {0:.3f} '. Format (MATH.PI)) Table = {' Sjoerd ': 4127, ' Jack ': 4098, ' dcab ': 7678}for name, phone in Table.items (): Print (' {0:10} ==& Gt {1:10d} '. Format (name, phone)) Table = {' Sjoerd ': 4127, ' Jack ': 4098, ' dcab ': 8637678}print (' Jack: {0[jack]:d}; Sjoerd: {0[sjoerd]:d}; ' Dcab: {0[dcab]:d} '. Format (table)

Original: http://www.cnblogs.com/RukawaKaede/p/6069977.html

Python output format and function format