Python2.7-string Module

String module

1. Constants defined within the module

Letters (ascii_letters, letters), numbers (digits, hexdigits, octdigits), spaces (whitespace), capitalization (Ascii_lowercase, Ascii_uppercase, lowercase, uppercase), punctuation (punctuation), the printable collection in the foregoing (printable)

2, formatted string, basically similar to the built-in STR type function, the format is "{" [Field_name] ["!" conversion] [":" Format_spec] "}"
Field_name is the name of the label at the format, you can omit
Conversion can be value R or S, respectively, represented by REPR () and STR ()
Format_spec format is [[Fill]align][sign][#][0][width][,][.precision][type]
Fill is any character that fills to the width length
Align can be "<", ">", "=", "^", respectively, left-aligned, right-aligned, and filled between the numbers ' symbols and numbers, centered
Sign can be "+", "-", "", respectively, to add symbols for all numbers, add symbols only for negative numbers, add spaces before positive numbers, and add symbols for negative numbers
# add "0b", "0o", "0x" respectively before binary 86 or 16
0 The effect is the same as [fill] set to "0" or [align] set to "="
width Specifies the length of the string
, add commas to each three digits
. precision specifies the number of decimal digits, cannot be used for integers, and specifies the maximum number of characters for non-numeric use
Type can be "B" (binary), "C" (numeric to Unicode character), "D" (decimal), "E" (scientific notation), "E", "F" (Default 6 decimal places), "F", "G" (common format), "G", "N" (with G), "O" (octal), "s" (default format, String), "X" (hexadecimal), "x", "%" (the number is represented by percentile)

3. Template class in the string module

With $ ID, similar to% and formatted
>>> from string import Template
>>> s = Template (' $who likes $what ')
>>> S.substitute (who= ' Tim ', what= ' Kung Pao ')
' Tim likes Kung Pao '

4. Other methods of the string module

String.capwords (s [, Sep]) is similar to Str.title (), except that the SEP split string can be set
String.maketrans (from, to) is the same as str.translate ()

Summarize:
The function of the string module is essentially the same as the built-in STR type

Add some of the commonly used STR functions:
Str.count (Sub [, Start[,end]]) Statistics the number of sub occurrences in Str
Str.endswith (suffix [, start[,end]]) determines whether the end of STR is suffix
Str.startswith (prefix [, start[,end]]) to determine whether STR starts with prefix
Str.format (*args, **keargs) formatting strings
Str.strip ([chars]) removes the specified character from the front and back of STR, the default is a space, and the Lstrip and Rstrip methods
Str.split ([Sep[,maxsplit]]) returns the list of split strings with Sep, with a maximum of maxsplit times
Str.join (iterable) connects the Iterable object of the string type to str.
Str.upper (). Lower () to case the string

Python2.7-string Module