Getting started with python-strings

String

A string is ‘ any text enclosed in single or double quotation marks " , such as ‘abc‘ , and "123" so on.

Note that ‘‘ or "" itself is just a representation, not part of a string, so the string is ‘abc‘ only a , b c this 3 characters. If it ‘ is also a character, it can be "" enclosed, such as the character that contains it,,, the space, the "I‘m OK" I ‘ m O K 6 characters.

To create a string:

1 a = 'Hello world! ' 2 B = "Python ralvin"

Corresponding operation:

1 #1 * Repeating output string2 Print('Hello'* *)3  4 #2 [], [:] Get the character in the string by index, here and the list of slice operation is the same, the concrete content see list5 Print('HelloWorld'[2:])6  7 #3 in member operator-returns TRUE if the string contains the given character8 Print('El' inch 'Hello')9  Ten #4% format string One Print('Alex is a good teacher') A Print('%s is a good teacher'%'Alex') -   -   the #5 + string concatenation -A='123' -b='ABC' -C='789' +d1=a+b+C - Print(D1) + #+ low efficiency, the use of join AD2="'. Join ([a,b,c]) at Print(D2)

Python's built-in approach:

1 #string.capitalize () capitalizes the first character of a string2 #string.center (width) returns the center of the original string and fills the new string with a space of length width3 #string.count (str, beg=0, End=len (String)) returns the number of occurrences of STR in a string, if beg or end specifies the number of occurrences of STR in the specified range4 #String.decode (encoding= ' UTF-8 ', errors= ' strict ') decodes a string in encoding specified encoding format, if an error defaults to a ValueError exception unless err ORS specifies ' ignore ' or ' replace '5 #String.encode (encoding= ' UTF-8 ', errors= ' strict ') encodes a string in encoding specified encoding format, and if an error defaults to a ValueError exception, unless errors specifies Is ' ignore ' or ' replace '6 #string.endswith (obj, beg=0, End=len (string)) checks whether the string ends with obj, if beg or end specifies whether the specified range ends with obj, if yes, returns TRUE, no False is returned.7 #string.expandtabs (tabsize=8) Turns the tab symbol in string strings to a space, and the default number of spaces in the tab symbol is 8. 8 #string.find (str, beg=0, End=len (string)) detects if STR is contained in a string, and if beg and end specify a range, then the check is contained within the specified range if it is the index at which the start is returned Value, otherwise return-19 #string.index (str, beg=0, End=len (String)) is the same as the Find () method, except that STR does not report an exception if it is not in a string.Ten #String.isalnum () returns True if the string has at least one character and all characters are letters or numbers, otherwise False One #String.isalpha () returns True if the string has at least one character and all characters are letters, otherwise False A #String.isdecimal () returns True if the string contains only a decimal number, otherwise False is returned. - #string.isdigit () returns True if the string contains only a number, otherwise False. - #String.islower () returns True if the string contains at least one case-sensitive character, and all of these (case-sensitive) characters are lowercase, otherwise Fal Se the #string.isnumeric () returns True if the string contains only numeric characters, otherwise False - #string.isspace () returns True if the string contains only spaces, otherwise False. - #String.istitle () returns True if string is heading (see Title ()), otherwise False - #String.isupper () returns True if the string contains at least one case-sensitive character, and all of these (case-sensitive) characters are uppercase, otherwise Fal Se + #string.join (seq) merges all the elements in the SEQ (the string representation) into a new string, using string as a delimiter - #string.ljust (width) returns the left alignment of an original string and fills the new string with a space of length width + #String.Lower () converts all uppercase characters in a string to lowercase. A #String.lstrip () truncates the left space of a string at #String.maketrans (Intab, Outtab]) the Maketrans () method is used to create a conversion table of character mappings, for the simplest invocation of two parameters, the first argument is a string representing the character that needs to be converted , the second parameter is also the target of the string representation transformation.  - #Max (str) returns the largest letter in the string str.  - #min (str) returns the smallest letter in the string str.  - #string.partition (str) is a bit like the combination of find () and split (), which, starting from the first position in Str, divides the string into a 3 The tuple of elements (STRING_PRE_STR,STR,STRING_POST_STR), if the string does not contain str, then string_pre_str = = String. - #string.replace (str1, str2, Num=string.count (STR1)) replaces str1 in string with STR2, and if NUM is specified, the substitution is not more than num times. - #string.rfind (str, Beg=0,end=len (string)) is similar to the Find () function, but looks up from the right. in #string.rindex (str, Beg=0,end=len (string)) is similar to index (), but starts from the right. - #string.rjust (width) returns the right alignment of the original string and fills the new string with a space of length width to #string.rpartition (str) is similar to the partition () function, but looks up from the right. + #String.rstrip () deletes a space at the end of a string string. - #String.Split (str= "", Num=string.count (str)) slices a string with the Str delimiter, and if NUM has a specified value, only the NUM substring is delimited the #string.splitlines (num=string.count (' \ n ')) is separated by rows, returns a list containing the rows as elements, and if num specifies only a slice of num rows. * #string.startswith (obj, 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 range. $ #String.strip ([obj]) executes Lstrip () and Rstrip () on stringPanax Notoginseng #string.swapcase () flips the casing in a string - #String.title () returns a string that is "heading", meaning that all words start with uppercase and the remaining letters are lowercase (see istitle ()) the #string.translate (str, del= "") converts string characters according to the table given by STR (contains 256 characters), and the characters to be filtered out into the del parameter + #string.upper () converts lowercase letters in string to uppercase

Getting started with python-strings