Life is short, I learn the magic of Python's Python string

A ='Wuzemwuzem'#capitalize, the first letter of the string, the rest lowercase. #if the first character of the string is a non-alphabetic character, the original string is returned. The string contains only non-alphabetic word compliance, but returns the original string. such as:v =a.capitalize ()Print(v)#center,20 Indicates the total length,#no blank padding, optionalV1 = A.center (20,'No')Print(v1)#count, statistics, to find the number of ' U ' in the stringV2 = A.count ('u')Print(v2)#EndsWith, string with what end, StartsWith, start with what, return bool valueV3 = A.endswith ('W') V4= A.startswith ('W')Print(V3,V4)#Find , looking back from the beginning, finds the first one, gets its position, cannot find the return-1V5 = A.find ('W')Print(V5)#format, Placeholderv6=A.format ()#Isalnum, judging that only numbers and letters can appear, return boolV7 =A.isalnum () b='alssflk$#%'V8=B.isalnum ()Print(V7)Print(V8)#Isalpha only appear letters, kanji, return boolV11 =A.isalpha ()Print(v11)#expandtabs, the tab symbol in string strings is converted to a space, and the default number of spaces in the tab symbol is 8. SegmentationV9 = A.expandtabs (20) Test='username\temail\tpassword\nw770723324\[email protected]\t12345\nw770723324\[email protected]\t12345\n'V10= Test.expandtabs (20)Print(V10)Print(v9) test='21,342'#Isdecimal,isdecimal to determine if the input is a numberV1 = Test.isdecimal ()#only decimal digits are supportedV2 =test.isdigit ()#contains both decimal decimals and special digital ②V3 = Test.isnumeric ()#Contains both decimal decimals and special numeric ②, including Chinese numeralsPrint(V1,V2,V3)#Swapcase, converting the case of a stringV1 =a.swapcase ()Print(v1)#Isidentifier () determines whether a string is a valid identifier, and the string contains only Chinese text conformance, which in fact determines whether the variable name is valid. Asc ='123ADF'V13=C.isidentifier ()Print(V13) C='_3HF'V13=C.isidentifier ()Print(V13)#str.isprintable (): Determines whether the characters contained in the string are all printable. The string contains a non-printable character, such as an escape character, that returns false. A ='ASDFH\TK'Test=a.isprintable ()Print(test)#isspace judgment is all spacesA ='      'v=a.isspace ()Print(v)#Str.title (): The first letter of each word in the string is capitalized and the remaining lowercase. The first character of a word is a non-alphabetic character and does not affect conversions. The string contains only non-alphabetic word compliance, but returns the original string. such as:A='AB CD'v=A.title ()Print(v)#Istitle to determine if the title format is capitalized in the first letterv=A.istitle ()Print(v)#Str.join (sequence), sequence--sequence of elements to concatenateA ='You're the wind, I'm a fool'b='_'Print(B.join (a)) test='Wuzem'#Ljust, returns an original string left aligned, and uses Fillchar to fill a new string of length width, fillchar default to a space. #Rjust Returns the right alignment of an original string and fills a new string with width of length using Fillchar (default space)V1 = Test.ljust (20,'*') V2= Test.rjust (20,'*')Print(V1,V2)#Islower Determines whether characters are all lowercase#Lower speak string all to lowercasetest='Wuzm'v1=test.islower () v2=Test.lower ()Print(V1,V2)#Isupper Determines whether characters are all uppercase#Upper The string to all uppercasev3=test.isupper () v4=Test.upper ()Print(V3,V4)#rstrip () remove whitespace at the end of a string string to remove the specified stringTest ='Wuzem'v1= Test.lstrip ('W') V2=Test.rstrip () v3=Test.strip ()Print(V1,V2,V3)#Maketrans () creates a conversion table of character mappings, for the simplest invocation of two parameters, the first argument is a string that represents the character that needs to be converted, and the second argument is the target of the string representation of the transformation. #translate () converts string characters according to the table given by STR (256 characters), and the characters to be filtered out into the Deletechars parameterv ='Dhflksha;lsdjfowaa'm= Str.maketrans ('ABCD','1234') New_v=v.translate (m)Print(NEW_V)#Num=string.count (str)) intercepts a string with the Str delimiter, and only the NUM substring if NUM has a specified valueV1=v.split ('s', 2)Print(v1)#returns a tuple of $3, the first is the substring to the left of the delimiter, the second is the delimiter itself, and the third is a substring to the right of the delimiter. V2 = V.partition ('s')Print(v2)#Splitlines ([keepends]) is separated according to the line (' \ r ', ' \ r \ n '),#returns a list containing the rows as elements, if the argument keepends is False, does not contain a newline character, and if true, the newline character is preservedTest ='SDKF\NJHSDF\NHSLSDF'v=test.splitlines (True)Print(v) V2=test.splitlines (False)Print(v2)

Life is short, I learn the magic of Python's Python string