An example of the function of the Python3 string is explained in detail

Add function (Append string after)

S1 = ' Hello ' s2 = s1.__add__ (' boy! ') Print (s2) #输出: Hello boy!

Contains (determines whether a string is included, contains returns True)

S1 = ' Hello ' result = s1.__contains__ (' He ') print (Result) #输出: True

EQ (determines if two strings are the same, returns true if the same)

S1 = ' Hello ' s2 = ' how ' result = s1.__eq__ (s2) print (Result) #输出: False

Format

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GetAttribute

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GetItem

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Getnewargs

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GE (greater than or equal to)

Print (' B '. GE (' a ')) #输出: True

GT (Greater than)

Print (' B '. GE (' a ')) #输出: True

Hash

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Iter

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Len (return string length)

Print (' abc '. Len ()) #输出: 3

Le (less than or equal to)

Print (' B '. Le (' a ')) #输出: False

LT (less than)

Print (' B '. Lt (' a ')) #输出: False

MoD

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Mul

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New

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Ne

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Repr

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Rmod

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Rmul

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sizeof

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STR (return to self)

Print (' abc '. __STR__ ()) #输出: ABC

Capitalize (first letter capital)

s = ' tom ' Print (S.capitalize ()) #输出: Tom

Casefold (uppercase converted to lowercase)

s = ' tom ' Print (S.casefold ()) #输出: Tom

Center (specify length and padding characters, center content, fill word Fuliushi space)

s = ' tom ' Print (S.center, '-') #输出:--------Tom---------

Count (calculates the number of occurrences of a string, the second argument: start position, third parameter: End position)

s = ' AABBBCCCCCDD ' Print (S.count (' cc ', 3,11)) #输出: 2

Encode (coded)

s = "Chinese" Print (S.encode (' GBK ')) #输出: B ' \xd6\xd0\xce\xc4 '

EndsWith (determines whether a string ends with a character or string, the second argument: start position, third parameter: End position)

s = ' Projects ' Print (S.endswith (' ts ')) print (S.endswith (' e ', 0,5)) #输出: true#     True

Expandtabs (convert 1 tab keys to 7 spaces)

s = ' h\ti ' Print (S.expandtabs ()) #输出: H       I

Find (finds the index position of a character or string, the second parameter: Start position, third parameter: End position)

s = ' Hello ' Print (S.find (' o ')) print (S.find (' O ', 0,3))  #找不到返回 -1# output: 4#     -1

Format (string formatting/splicing)

name = ' Tom ' age = 18s = ' {0}\ ' 's age is {1} '. Format (name,age) print (s) #或者str = ' {name}\ ' 's age was {age} ' result = Str.format (a Ge=18,name= ' Tom ') print (Result) #输出: Tom ' s age is 18

Format_map

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Index (finds the indexed position of a character or string, unlike find, if the character does not exist, it will be an error)

s = ' Hello ' Print (S.index (' o ')) print (S.index (' e ', 0,3)) #输出: 4#     1

Isalnum (whether it is a letter or a number)

s = '!# ' Print (S.isalnum ()) #输出: False

Isalpha (whether it is a letter)

s = ' 123 ' Print (S.isalpha ()) #输出: False

Isdecimal (whether it is a decimal number)

s = ' 123 ' Print (S.isdecimal ()) #输出: True#true:unicode number, full-width digit (double byte) #False: Roman numerals, Chinese numerals #error:byte digits (single byte)

IsDigit (whether a number)

s = ' 123 ' Print (S.isdigit ()) #输出: true#true:unicode number, byte digit (single byte), Full width digit (double byte), Roman numeral #false: Chinese numerals

Isidentifier (whether identifier/variable name)

s = ' 1num ' Print (S.isidentifier ()) #输出: false# Because the variable name cannot start with a number

Islower (whether all lowercase letters)

s = ' Hello ' Print (S.islower ()) #输出: False

IsNumeric (whether a number)

s = ' 123 ' Print (S.isnumeric ()) #输出: True#true:unicode digits, full-width numerals (double-byte), Roman numerals, Chinese numerals

isprintable (whether printable character/can output as-is)

s = ' \ n ' Print (s.isprintable ()) #输出: False

Isspace (whether it is a space)

Print (". Isspace ()) print (' \ t '. Isspace ()) #输出: true#     True

Istitle (whether the title/first letter of each word is capitalized)

Print (' Hello Boy ', Istitle ()) print (' Hello Boy '. Istitle ()) #输出: true#     False

Isupper (whether all uppercase letters)

Print (' Boy ', Isupper ()) print (' Boy '. Isupper ()) #输出: true#     False

Join (generates a new string for the elements in the sequence with the specified character connection)

s = [' H ', ' e ', ' l ', ' l ', ' O ']print ('. Join (s)) ' Print ('-'. Join ') #输出: hello#     H-e-l-l-o

Ljust (specify length and padding characters, content left-aligned, padding word Fuliushi is a space)

s = ' Hello ' print (S.ljust (ten, '-')) #输出: Hello-----

Lower (all strings converted to lowercase)

s = ' tom ' Print (S.lower ()) #输出: Tom

Lstrip (removes the specified character to the left of the string, the default is a space)

s = '   tom ' Print (S.lstrip ()) #输出: Tom

Maketrans (Create a conversion table of character mappings, use with the Translate function)

Intab = "ABCDE" Outtab = "12345" Trantab = Str.maketrans (intab, outtab) str = "Hello abc" Print (Str.translate (trantab)) #输出: H 5llo 123

Partition (Specify delimiter, split string)

s = ' iamtom ' Print (s.partition (' AM ')) #输出: (' I ', ' am ', ' Tom ')

Replace (replaces the old string in the string with the new one), and if you specify the third parameter max, the replacement does not exceed Max times. )

s = ' Tom ' Print (S.replace (' m ', ' O ') #输出: Too

RFind (finds the location of the specified string from the right, and returns 1 if no match is found)

s = ' one-one ' print (S.rfind (' one ')) print (S.rfind (' One ', 0,6))  #指定起始和结束位置 # output: 8#     0

Rindex (finds the location of the specified string from the right, if no match is present)

s = ' one-one ' print (S.rindex (' one ')) print (S.rindex (' One ', 0,6))  #指定起始和结束位置 # output: 8#     0

Rjust (Specifies the length and padding characters, right-aligned content, padding character Fuliushi, or spaces)

s = ' Hello ' print (S.rjust (ten, '-')) #输出:-----Hello

Rpartition (Specifies the delimiter, starting from the right to split the string)

s = ' iamtom_iamtom ' Print (s.rpartition (' AM ')) #输出: (' iamtom_i ', ' am ', ' Tom ')

Rsplit (Specifies the delimiter to slice the string, and if you specify num for the second parameter, only num times are separated and a list is returned)

s = ' A b c d ' Print (S.rsplit ()) Print (S.rsplit (', 2))  #从右边开始, separated by spaces two times # output: [' A ', ' B ', ' C ', ' d ']#     [' A B ', ' C ', ' d ']

Rstrip (removes the specified character at the end of the string, the default is a space)

s = '!!! I am TOM!!! ' Print (S.rstrip ('! ')) #输出:!!! I am Tom

Split (Specifies the delimiter to slice the string, and if you specify num for the second parameter, only num is separated, and then a list is returned)

s = ' A b c d ' Print (S.split ()) Print (S.split (', 2)) #从左边开始, separated by spaces two times # output: [' A ', ' B ', ' C ', ' d ']#    [' A ', ' B ', ' C d ']

Splitlines (separates strings by newline character, returns a list)

s = ' a\nb\nc ' Print (S.splitlines ())    #默认参数为Falseprint (S.splitlines (True)) #指定Ture参数 preserves line break # output: [' A ', ' B ', ' C ']#     [' a\n ', ' b\n ', ' C ']

StartsWith (Determines whether a string begins with a character or string, the second argument: start position, third parameter: End position)

s = ' Projects ' Print (S.startswith (' Pr ')) print (S.startswith (' e ', 4,8)) #输出: true#     True

Strip (The specified character before and after the string is deleted, the default is a space)

s = '!!! I am TOM!!! ' Print (S.strip ('! ')) #输出: I am Tom

Swapcase (case swap)

s = ' I Am Tom ' Print (S.swapcase ()) #输出: I am Tom

Title (converted to title, the first letter of each word capitalized)

s = ' I Am Tom ' Print (S.title ()) #输出: I am Tom

Translate (character substitution based on the table created by the Maketrans method)

Intab = "ABCDE" Outtab = "12345" Trantab = Str.maketrans (intab, outtab) str = "Hello abc" Print (Str.translate (trantab)) #输出: H 5llo 123

Upper (lowercase converted to uppercase)

s = ' Hello ' print (S.upper ()) #输出: Hello

Zfill (Specifies the length of the string. Original string right-aligned, front padding 0)

s = ' Hello ' Print (S.zfill (10)) # Output: 00000Hello