A brief discussion on the simple use of python string methods-Python Tutorial-php.cn

Learn how to use python string methods, try out each method listed in the book, and record the results for future query.

(1) s.capitalize(); Function: Return a copy of the string and capitalize the first letter. Use as follows:

>>> s = 'wwwwww'
 >>> scap = s.capitalize()
 >>> scap 
 'Wwwwww'

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(2) s.center(width,char); Function: Returns a string of length width with the s string placed in the middle. By default, other parts are filled with spaces, otherwise the char parameter is used to fill. Examples are as follows:

>>> s 
'wwwwww'
>>> s = 'wwwwww'
>>> scen = s.center(20)
>>> scen
'    wwwwww    '
>>> scen0 = s.center(20,'Y')
>>> scen0
'YYYYYYYwwwwwwYYYYYYY'
>>>

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(3) s.count(t,start,end); Function: Return the number of string t in string s (or in a sub-segment of string). Examples are as follows:

>>> scen0
'YYYYYYYwwwwwwYYYYYYY'
>>> scoun = scen0.count('w',0,19)
>>> scoun
6

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(4) s.endswith(x,start,end); Function: If s (or split with start and end) ends with the string x, return True, otherwise return False.

>>> scen0 
'YYYYYYYwwwwwwYYYYYYY'
>>> sends0 = scen0.endswith('Y',1,19)
>>> sends0
True
>>> sends1 = scen0.endswith('w',1,10)
>>> sends1
True

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(5) s.find(t,start,end); Function: Return the leftmost position of string t in s (or start:end slice). If t is not found, return -1. Use s.rfind(t,start,end) to find the rightmost position of t. Examples are as follows:

>>> s
'YYYYYYYwwwwwwYYYYYYY'
>>> t = 'w'
>>> sfind = s.find(t,0,19)
>>> sfind
7
>>> srfind = s.rfind(t,1,19)
>>> srfind
12

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(6) s.isalnum(); Function: If s is not empty and each character is alphanumeric, it returns True.

 >>> s
 'YYYYYYYwwwwwwYYYYYYY'
 >>> sisa = s.isalnum()
 >>> sisa
 True

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(7)s.isalpha(); Function: If s is not empty and each character is a letter, it returns True

>>> s
'YYYYYYYwwwwwwYYYYYYY'
>>> sisal = s.isalpha()
>>> sisal
True

>>> s1
'ssss0000'
>>> sisal0 = s1.isalpha()
>>> sisal0
False

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(8)s.isdigit(); Function: If s is not empty and each character is an ASCII digit, return True.

>>> sdigit = 'www000'
>>> sd = sdigit.isdigit()
>>> sd
False
>>> sdigit0 = '1234567890'
>>> sd0 = sdigit0.isdigit()
>>> sd0
True

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(9)s.islower(); Function: If s has at least one lowercase character, and all lowercase characters are lowercase, return True.

>>> s0 = '1234567890'
>>> s0lower = s0.islower()
>>> s0lower
False

>>> s1 = '1234WWW'
>>> s1lower = s1.islower()
>>> s1lower
False


>>> s2 = '123456789w'
>>> s2lower = s2.islower()
>>> s2lower
True

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(10) s.isspace(); Function: If s is not empty and each character in s is a blank character, it returns True.

>>> s = ''
>>> s0 = s.isspace()
>>> s0
False
>>> s = '  '
>>> s0 = s.isspace()
>>> s0
True

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(11) s.istitle(); Function: If s is a non-empty string with the first letter capitalized, return True.

>>> s = 'wy'
>>> s0 = s.istitle()
>>> s0
False
>>> s = 'Wy'
>>> s0 = s.istitle()
>>> s0
True

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(12)s.isupper(); Function: Returns True if s has at least one uppercase character and all uppercase characters are uppercase.

>>> s = 'wy'
>>> s0 = s.isupper()
>>> s0
False

>>> s = 'Wy'
>>> s0 = s.isupper()
>>> s0
False

>>> s = 'WY'
>>> s0 = s.isupper()
>>> s0
True

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(13) s.join(seq); Function: Returns the result of the sequence seq after being connected, and s is between each two items.

>>> seq = 'WWWWWWW'
 >>> s = 'y'
 >>> snew = s.join(seq)
 >>> snew
 'WyWyWyWyWyWyW'

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(14) s.lower(); Function: Change the characters in s to lowercase.

>>> snew
 'WyWyWyWyWyWyW'
 >>> s =snew.lower()
 >>> s
 'wywywywywywyw'

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(15) s.replace(t,u,n); Function: Returns a copy of s, where each t (or at most n) is replaced with u.

>>> s
'wywywywywywyw'
>>> sre = s.replace('w','W')
>>> sre
'WyWyWyWyWyWyW'

>>> s
'wywywywywywyw'
>>> sre = s.replace('w','W',4)
>>> sre
'WyWyWyWywywyw'

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(16) s.swapcase(); Function: Return a copy of s, and lowercase uppercase characters and uppercase lowercase characters.

>>> s = 'WyWyWyWy'
 >>> ssw = s.swapcase()
 >>> ssw
 'wYwYwYwY'

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(17) s.zfill(w); Function: Return a copy of s. If it is shorter than w, add 0 at the beginning to make its length w.

>>> s = 'www'
 >>> sz = s.zfill(10)
 >>> sz
 '0000000www'

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