Python commonly used string functions

Conversion of character case in string

1. str.lower() //Lowercase

>>> ; 'SkatE'.lower()
'skate'

2. str.upper() //Capital

>>> 'SkatE'.upper ()
'SKATE'

3. str.swapcase() //Case swap

>>> 'SkatE'.swapcase()
'sKATe'

4. str.title() //The first letter is capitalized and the rest are lowercase

>>> 'SkatE'.title()
'Skate'

String alignment during output

1. str.ljust(width,[fillchar]) // Output width characters, str is left-aligned, the missing part is filled with fillchar, the default is spaces

>>> 'skate'.ljust(10)
'skate '
>>> 'skate'.ljust(10,'0')
'skate00000'

2. str.rjust(width,[fillchar]) //Output width characters, str is right-aligned, and the missing part is filled with fillchar. The default is spaces

>>> 'skate'.rjust(10,'0')
'00000skate'
>>> 'skate'.rjust(10)
' skate'

3. str.center(width,[fillchar]) //Center alignment

>>> 'skate'.center(10)
' skate '
>>> 'skate'.center(10,'0')
'00skate000'

4. str.zfill(width) //Change str to width length, align it on the right, and fill in the missing part with 0

>>> 'skate'. zfill(10)
'00000skate'

String search related

##str.find('t') / /Search for the specified string, no return -1

str.find('t',start) //Specify the starting position to search
str.find('t',start,end) //Specify the start and end position search:
str.rfind('t') //Search from the right
str.count('t') //How many specified strings are searched:

eg:##>>> 'skate'.find('t')

3

>>> 'skate'.find('t ',2)
3
>>> 'skate'.find('t',2,4)
3
>>> 'skate'.rfind( 't')
3
>>> 'skate'.count('t')
1

String replacement

str.replace('old','new') //Replace old with new

str.replace('old','new',maxReplaceTimes) //Replace specified number of times old with new

eg:

>>> 'skateskate'.replace('s','S')

'SkateSkate'

> >> 'skateskate'.replace('s','S',1)
'Skateskate'
>>>

String to remove spaces and remove Specify characters

str.strip([chars]) //Remove the chars on both sides, the default is spaces

str.lstrip([chars]) //Remove the chars on the left, the default is spaces

str.rstrip([chars]) //Remove the chars on the right, the default is space

String splitting

str.split([sep, [maxsplit]]) //Use sep as the separator to divide str into a list. maxsplit represents the number of splits. The default separator is a blank character

str.rsplit([sep, [maxsplit]])

str.splitlines([keepends]) //Divide str into a list according to the line separator, keepends is a bool Value, if true will retain line separators after each line.

eg:

#>>> 'skateskate'.split()['skateskate']

>>> 'skateskate'.split('e')

['skat', 'skat', '']

>>> 'skate skate' .rsplit(' ')
['skate', 'skate']

>>> 'skate\n skate1'.splitlines()
['skate', ' skate1 ']

>>> 'skate\n skate1'.splitlines(1)

['skate\n', ' skate1']
>>>


String connection

str.join(seq) //Connect the sequence (string sequence) represented by seq with str

eg:

>>> 'skate'.join('111')
'1skate1skate1

String judgment

str.startwith(prefix [,start[,end]]) //Whether it starts with prefix
str.endwith(suffix[,start[,end]]) //Whether it ends with suffix
str.isalnum() //Whether it is complete It is the letter and number, and at least one character
Str.isalpha () // Whether it is all letter, and at least one character
Str.isdigit () // Whether it is all numbers, and at least one character
str.isSpace () // Whether it is all blank characters, and at least one character
Str.islower () // Whether the letters in the sTR are all lowercase
str.isuper () // str. Whether the letter in the middle is a capitalized
Str.istition () // Whether the STR is the first letter? 'skate'.startswith('s')

True

>>> 'skate'.startswith('s',1,2)False>>> 'skate'.endswith('s',1,2)

False

>>> 'skate'.endswith('e',1,2)
False
> >> 'skate'.endswith('e',1)
True
>>>

True
>>> 'skate'.isalnum ()
True
>>> '222'.isalnum()
True

>>> 'skate222'.isalnum()

True
> ;>> 'skate 222'.isalnum()
False
>>>


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