python--String Common operations

<1>find

Detects if STR is included in MyStr, or returns 1 if the index value is returned.

mystr.find(str, start=0, end=len(mystr))

<2>index

Just like the Find () method, only if STR does not report an exception in MyStr.

<3>count

Returns the number of times that STR appears in the mystr between start and end

mystr.count(str, start=0, end=len(mystr))

<4>replace

Replace the str1 in mystr with the STR2 if count specifies that the replacement is not more than count times.

mystr.replace(str1, str2,  mystr.count(str1))

<5>split

Slice mystr with Str as delimiter, if Maxsplit has a specified value, only maxsplit substrings are delimited

<6>capitalize

Capitalize the first character of a string

mystr.capitalize()

<7>title

Capitalize the first letter of each word in a string

>>> a = "hello world">>> a.title()‘Hello World‘

<8>startswith

Checks whether the string starts with obj, or returns True, otherwise False

mystr.startswith(obj)

<9>endswith

Checks whether the string ends with obj, or returns False if True.

mystr.endswith(obj)

<10>lower

Convert all uppercase characters in mystr to lowercase

mystr.lower()        

<11>upper

Convert lowercase letters in mystr to uppercase

mystr.upper()    

<12>ljust

Returns the left alignment of an original string and fills the new string with the width of length with a space

<13>rjust

Returns the right alignment of the original string and fills the new string with the width of the length with a space

mystr.rjust(width)    

<14>center

Returns the center of the original string and fills the new string with a space of length width

mystr.center(width)   

<15>lstrip

Remove white space characters to the left of MyStr

mystr.lstrip()

<16>rstrip

Remove whitespace characters at the end of a mystr string

mystr.rstrip()    

<17>strip

Remove whitespace characters at both ends of a mystr string

>>> a = "\n\t hello \t\n">>> a.strip()‘hello‘

<18>rfind

Similar to the Find () function, it is just looking from the right.

mystr.rfind(str, start=0,end=len(mystr) )

<19>rindex

Similar to index (), but starting from the right.

mystr.rindex( str, start=0,end=len(mystr))

<20>partition

The mystr is divided into three parts, str, str and STR

mystr.partition(str)

<21>rpartition

Similar to the partition () function, but starts from the right.

mystr.rpartition(str)

<22>splitlines

Returns a list containing rows as elements, separated by rows

mystr.splitlines()  

<23>isalpha

Returns True if mystr all characters are letters, otherwise False

mystr.isalpha()  

<24>isdigit

Returns True if the mystr contains only a number, otherwise False.

<25>isalnum

Returns True if all mystr characters are letters or numbers, otherwise False

mystr.isalnum()  

<26>isspace

Returns True if the mystr contains only spaces, otherwise False is returned.

mystr.isspace()   

<27>join

Insert Str after each character in the mystr to construct a new string

mystr.join(str)

python--String Common operations