Python built-in string processing function collation

str= ' python String function '

Generate string variable str= ' python string function '

String length acquisition: len (str)
Example: print '%s length=%d '% (str,len (str))

Letter Handling
All Caps: Str.upper ()
All lowercase: str.lower ()
Case Swap: Str.swapcase ()
Initial capitalization, remaining lowercase: str.capitalize ()
Initial capital: Str.title ()
Print '%s lower=%s '% (str,str.lower ())
Print '%s upper=%s '% (str,str.upper ())
Print '%s swapcase=%s '% (str,str.swapcase ())
Print '%s capitalize=%s '% (str,str.capitalize ())
Print '%s title=%s '% (str,str.title ())
Formatting related
Get fixed length, right alignment, left not enough space to be padded: str.ljust (width)
Get fixed length, left alignment, right not enough space to complement: Str.ljust (width)
Get fixed length, middle alignment, not enough space on both sides: str.ljust (width)
Get fixed-length, right-aligned, left less than 0-padded
Print '%s ljust=%s '% (str,str.ljust (20))
Print '%s rjust=%s '% (str,str.rjust (20))
Print '%s center=%s '% (str,str.center (20))
Print '%s zfill=%s '% (str,str.zfill (20))

string Search related
search for specified string, no return -1:str.find (' T ')
specified starting position search: str.find (' T ', start)
Specify start and end position search: str.find (' T ', start,end)
Find from the right: str.rfind (' T ')
How many specified strings were searched: str.count (' T ')
All of the above methods can be replaced with index, the difference is that using index lookup does not throw an exception, and find returns-1
Print '%s find nono=%d '% (str,str.find (' nono ')
Print '%s "find t =%d '% (str,str.find (' t '))
Print '%s find t from%d=%d '% (str,1,str.find (' t ', 1)
"print '%s" find T from%d to%d=%d ' % (str,1,2,str.find (' T '))
#print '%s index Nono '% (str,str.index (' nono ',)
Print '%s rfind t=%d '% (str,st R.rfind (' t '))
Print '%s count t=%d '% (str,str.count (' T '))

String substitution related
Replace old to New:str.replace (' old ', ' new ')
Replace the specified number of times with old as New:str.replace (' old ', ' new ', maxreplacetimes)
Print '%s replace T to *=%s '% (str,str.replace (' t ', ' * '))
Print '%s replace T to *=%s '% (str,str.replace (' t ', ' * ', 1))

String go to space and go to specify character
Go on both sides space: Str.strip ()
Left Space: Str.lstrip ()
Go right space: Str.rstrip ()
Go to both sides of the string: str.strip (' d '), corresponding to the Lstrip,rstrip
str= ' python String function '
Print '%s strip=%s '% (str,str.strip ())
str= ' python String function '
Print '%s strip=%s '% (str,str.strip (' D '))

split string by specified character array: str.split (')

Default by Space
str= ' a b C de '
Print '%s strip=%s '% (str, Str.split ())
str= ' a-b-c-de '
print '%s strip=%s '% (str,str.split ('-'))

String Judgment Correlation
Whether to start with start: str.startswith (' start ')
End With end: str.endswith (' end ')
Whether it is all letters or numbers: Str.isalnum ()
Full Letter: Str.isalpha ()
Whether full number: str.isdigit ()
Full Lowercase: str.islower ()
All Caps: Str.isupper ()
str= ' python String function '
Print '%s startwith t=%s '% (str,str.startswith (' t '))
Print '%s endwith d=%s '% (str,str.endswith (' D '))
Print '%s isalnum=%s '% (str,str.isalnum ())
Str= ' Pythonstringfunction '
Print '%s isalnum=%s '% (str,str.isalnum ())
Print '%s isalpha=%s '% (str,str.isalpha ())
Print '%s isupper=%s '% (str,str.isupper ())
Print '%s islower=%s '% (str,str.islower ())
Print '%s isdigit=%s '% (str,str.isdigit ())
Str= ' 3423 '
Print '%s isdigit=%s '% (str,str.isdigit ())

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Python built-in string processing function collation