Python: string

string: Enclose the single quotation mark (') or double quotation mark (") and use a backslash (\) to escape the special Character.

Creation and assignment of strings:

' HelloWorld '  = str(= str ([1,2,3,4,5])  # converts the list to a string str1 = str ((1,2,3,4,5))  #  convert tuples to Strings

string Access:

str ='Runoob'Print(str)#Output StringPrint(str[0:-1])#outputs all characters from the first to the penultimatePrint(str[0])#the first character of the output stringPrint(str[2:5])#outputs the characters from the third start to the fifthPrint(str[2:])#output all characters from the beginning of the thirdPrint(STR * 2)#output String two timesPrint(str +"TEST")#Connection String

Output result:

Runoobrunoornoonoobrunoobrunoobrunoobtest

Escape Character:

\ (at End of line): continuation character \ \: backslash \ ' : Single quotation mark \b: backspace \ n: line break \ R: Enter \f: page change \v: portrait tab \ t: Transverse tab

For example:

>>>Print('let\ ' s go!')#escaped with escape character "\"Let's go!or:>>>Print("let ' s go!") example: Output C:\now path>>> str ='C:\\now'       #escape with escape character>>>Print(str) C:\now#If there are many such \ times, for example: C:\Program files\intel\wifi\help
#原始字符的使用非常简单, just precede the string with an English letter R>>> str ='C:\now'>>>Print(str) C:ow>>> str = r'C:\now'    #after adding R>>>Print(str) C:\now

String formatting:

String formatting:% (%s: formatted string%d: formatted integer,%c: formatted character and its ASCII code,%f: formatting floating point

Cases:

Print (" my name is%s this year is%d! ") " % (' Xiao Ming ', 10))

Output result:

My name is Xiao Ming this year 10 years old!

String built-in Functions:

Capitalize ():#converts the first character of a string to uppercaseCenter (width, fillchar):#returns a string that specifies the width of the center, Fillchar to a filled character, and a space by defaultCount (str, beg= 0,end=len (string)):#returns the number of occurrences of STR in a string, if beg or end specifies that the number of STR occurrences in the specified range is returnedDecode (encoding='UTF-8', errors='Strict')：#decodes a string by using the specified encoding. The default encoding is string encodingEndsWith (suffix, beg=0, End=len (string)):#checks whether the string ends with obj, or returns false if beg or end specifies that the specified range is terminated with obj, if it is trueExpandtabs (tabsize=8):#turns the tab in string into a space, the default number of spaces in the tab sign is 8Find (str, beg=0 End=len (string)):#detects if STR is contained in a string, and if beg and end specify a range, the check is contained within the specified range, and returns 1 if the index value of the start is returned .Index (str, beg=0, End=len (string)):#just like the Find () method, only if STR does not report an exception in the stringIsalnum ():#returns true if the string has at least one character and all characters are letters or numbers, otherwise falseIsalpha ():#returns true if the string has at least one character and all characters are letters, otherwise falseIsDigit ():#returns True if the string contains only numbers otherwise FalseIslower ():#returns true if the string contains at least one case-sensitive character, and all of these (case-sensitive) characters are lowercase, otherwise falseIsNumeric ():#returns True if the string contains only numeric characters, otherwise falseIsspace ():#returns True if the string contains only spaces, otherwise falseIstitle ():#returns True if the string is a caption, otherwise falseSupper ():#returns True if the string contains at least one case-sensitive character, and all of these (case-sensitive) characters are uppercase, otherwise falseJoin (seq):#merges all elements of the SEQ (the string Representation) into a new string with the specified string as a delimiter>>> temp ='I love You'>>> Temp.join ('*!')'*i Love you!'>>> Temp.join ('**!')'*i Love you*i love you!'>>> Temp.join ('***!')'*i love you*i love you*i love you!'Len (string):#return string lengthLower ():#uppercase letters in converted strings are lowercaseUpper ():#Lowercase letters in a converted string are capitalizedLjust (width[,fillchar]):#returns the left alignment of an original string and fills the new string with the width of length using fillchar, Fillchar The default is a spaceRjust (width,[,fillchar]):#returns the right alignment of an original string and fills a new string of length width with Fillchar (default space)Lstrip ():#remove spaces to the left of a stringRstrip ():#remove spaces at the end of a string stringMax (str):#returns the largest letter of the string strMin (str):#returns the smallest letter in the string strReplace (old,new[,max]):#Replace the str1 in the string with str2, if Max is specified, the replacement does not exceed Max times>>> temp ='I love You'>>> Temp.replace (' love',' love')'I love You'rfind (str, Beg=0,end=len (string)):#similar to the find () function, but looking from the rightSplit (str="", Num=string.count (str)):#num=string.count (str)) intercepts a string with the Str delimiter, and only the NUM substring if NUM has a specified value>>> str1 ='HelloWorld'>>> Str1.split ('o')['Hell','W','Rld']splitlines (num=string.count ('\ n'))：#Returns a list that contains rows as elements, separated by rows, if NUM specifies that only num rows are slicedStartsWith (str, Beg=0,end=len (string)):#checks whether the string starts with obj, returns true, or False. If beg and end specify a value, the check is within the specified rangeStrip ([chars]):#remove spaces around a string>>> str1 ='Hellowor LD'>>>str1'Hellowor LD'>>>str1.strip () swapcase ():#convert uppercase in a string to lowercase, lowercase to uppercaseTranslate (table, deletechars="")：#converts a string character to a table (containing 256 characters) given by str, and the character to be filtered out into the Deletechars parameterZfill (width):#returns a string of length width, the original string right-aligned, front padding 0Isdecimal ():#checks whether the string contains only decimal characters and returns False if True

String

Python: string