Python str operation method (detailed description), pythonstr

Python str operation method (detailed description), pythonstr

1. str. format (): format the string using the "{}" Placeholder (the index number format and key-value pairs in the placeholder can be used together ).

>>> String = 'python {}, django {}, tornado {}'. format (2.7, 'web', 'tornado ') # correspond to each {} placeholder, enter string> string 'python2. 7. djangoweb, tornadotornado '>>> string = 'python {}, django {}, tornado {}'. format (2.7, 'web') Traceback (most recent call last): File "<pyshell #6>", line 1, in <module> string = 'python {}, django {}, tornado {}'. format (2.7, 'web') IndexError: tuple index out of range >>> string = 'python {0}, django {2}, tornado {1 }'. format (2.7, 'web', 'tornado ') # You can also specify the value to be entered (starting from 0, the subsequent values may not always be used, however, you must ensure that the specified position has a value.) >>> string 'python2. 7. djangotornado, tornadoweb '>>> string = 'python {py}, django {dja}, tornado {tor }'. format (tor = 'tornado ', dja = 'web', py = 2.7) # values can be assigned in the form of key-value pairs> string 'python2. 7. djangoweb, tornadotornado '>>>

2. Use "%" to format the string.

Format a symbol table

 

% C	Convert to single character
% R	Convert to a string expressed in repr ()
% S	Converted to a string expressed by str ()
% D or % I	Convert to a signed decimal integer
% U	Convert to an unsigned decimal integer
% O	Convert to an unsigned octal integer
% X	Converts the string to an unsigned hexadecimal integer. The hexadecimal letter is in lowercase.
% X	Converts the string to an unsigned hexadecimal integer. The hexadecimal letter is in uppercase.
% E	Converts it to a floating point number expressed in scientific notation, where e is expressed in lowercase.
% E	Converts it to a floating point number expressed in scientific notation, where E is expressed in uppercase.
% F or # F	Convert to floating point
% G	Python automatically converts the value to % e or % f based on the number size.
% G	Python automatically converts the value to % E or % F based on the number size.
%	Output "%"

 

 Auxiliary formatting symbol table

*	Defines the width or decimal point Precision
-	Left aligned
+	Returns the positive value symbol "+" to a positive number"
<Sp>	When the number size is less than m. n, fill in space
#	Display 0 before the octal digit, and 0x or 0X before the hexadecimal digit
0	When the number size is less than m. n, use 0 to fill
M. n	M is the minimum total width displayed, and n is the number of digits after the decimal point (if available)

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