Python STR Internal Function Introduction

def capitalize (self):

str = ' age '
Print (Str.capitalize ())
Result: Age
Conclusion: The first letter is capitalized, the other letters are lowercase

def casefold (self):

str = ' Age-age '
Print (Str.casefold ())

Results: Age-age
Conclusion: The first letter is capitalized, the other letters are lowercase

Def center (self, Width, fillchar=none):

str = ' Age-age '
Print (Str.center (20, ' = '))
Results: ======age-age=======
Conclusion: The string str is placed in a 20-length character, and the missing Fillchar characters are used to populate

def count (self, sub, Start=none, End=none):

str = ' Age-age '
Print (Str.count (' AG '))
Print (Str.count (' AG ', 5,6))
Results: 1, 0
Conclusion: Count the number of occurrences of a particular character in a string, or you can specify a starting position

def encode (self, encoding= ' utf-8 ', errors= ' strict '):

str = ' Chian '
Print (Str.endswith (' an ', 3,5))
Result: True
Conclusion: Returns whether a string ending with a specific character can be specified as the starting position

def expandtabs (self, Tabsize=none):

str = "\talex"
Print (Str.expandtabs ())
Print (Str.expandtabs (10))
Results: Alex/alex
Conclusion: The default Tab key is 8 spaces, plus a space with numbers as digits

def find (self, sub, Start=none, End=none):

str = "Alex is a Workhard man"
Print (Str.find (' is '))
Print (Str.find (' or ', 4,13))
Results: 5/11
Conclusion: To find a character in a string, you can specify the starting character

def format (*args, **kwargs):

def index (self, sub, Start=none, End=none):

str = "Alex is a Workhard man"
Print (Str.index (' is '))

Results: 5
Conclusion: To find character positions in a string, you can specify the starting character

def isspace (self):

#-*-Coding:utf-8-*-
str = '     fa '
Print (Str.isspace ())

Result: False
Conclusion: strings are required to be empty strings

def istitle (self):

str = "This is String Example ... Wow!!! "
Print (Str.istitle ())
str = "This is string EXAMPLE....WOW!!!"
Print (Str.istitle ())
Results: True/false
Conclusion: Only the first letter is capitalized is the title

def join (self, iterable):

str = "This is String Example ... Wow!!! "
Print (': '. Join (str))
STR1 = [' This ', ' was ', ' a ', ' book ']
Print (': '. Join (STR1))
STR2 = (' This ', ' was ', ' a ', ' book ')
Print (': '. Join (STR2))
STR3 = {' 1 ': ' This ', ' 2 ': ' Was ', ' 3 ': ' A ', ' 4 ': ' Book '}
Print ('-'. Join (STR3))

Results:

T:h:i:s:: i:s:: s:t:r:i:n:g:: e:x:a:m:p:l:e:.:.:.:w:o:w:!:!:!
This:is:a:book
This:is:a:book
2-4-1-3

Conclusion: Connect the characters with a connector.

def ljust (self, Width, fillchar=none):

STR1 = ' This was a book '
Print (Str1.ljust (20, ' # '))
Result: This is a book######
Conclusion: Left-justified, the default padding character is empty

def maketrans (self, *args, **kwargs):

Import string
str1 = ' ABCDE '
Map = Str1.maketrans (' abcde ', ' 12345 ')
Print (Type (map))
Print (map)
Results:

　　<class ' Dict ' >
{97:49, 98:50, 99:51, 100:52, 101:53}

Conclusion: ASCII a-97,1-49

　def partition (self, SEP):

Import string
str = "http://www.w3cschool.cc/"
Print (Str.partition ('///'))

Result: (' http: ', '//', ' www.w3cschool.cc/')

Conclusion: Three strings are returned, left is the left side of the delimiter, the right side is the delimiter to the right, and the middle is the divider

def replace (self, old, new, Count=none):

str = "http://www.w3cschool.cc//"
Print (Str.replace ('//', ' $$ ', 1))
Print (Str.replace ('//', ' $$ ', 2))
Results: http:$ $www. w3cschool.cc//        http:$ $www. w3cschool.cc$$

Conclusion: replace these old characters with new ones

def rfind (self, sub, Start=none, End=none):

str = "Hello,alex,alpha"
Print (Str.rfind (' al ', 5,13))
Results: 11
Conclusion: Find the rightmost character and return the index number

str = "Line1-a b c d e f\nline2-a b c\n\nline4-a b c D";
Print (Str.splitlines ())
Print (str.splitlines (0))
Print (Str.splitlines (3))
Print (Str.splitlines (4))
Print (Str.splitlines (5))
Results:

　[' Line1-a b c d E F ', ' line2-a b C ', ', ' line4-a b c d ']
[' Line1-a b c d E F ', ' line2-a b C ', ', ' line4-a b c d ']
[' Line1-a b c d e f\n ', ' line2-a b c\n ', ' \ n ', ' line4-a b c d ']
[' Line1-a b c d e f\n ', ' line2-a b c\n ', ' \ n ', ' line4-a b c d ']
[' Line1-a b c d e f\n ', ' line2-a b c\n ', ' \ n ', ' line4-a b c d ']

Conclusion: Returns a list containing the rows as elements

Python STR Internal Function Introduction