Python string processing function summary

Str & amp; #39; pythonStringfunction & amp; #39; generate the string variable str & amp; #39; pythonStringfunction & amp; #39; String length acquisition: len (str) str = 'Python String function'

Generate the String variable str = 'Python String function'

String length acquisition: len (str)

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

1. letter processing

All uppercase: str. upper ()

All lower case: str. lower ()

Case-insensitive: str. swapcase ()

Upper-case letters and lower-case letters: str. capitalize ()

Uppercase: 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 ())

2. formatting

Get fixed length, right alignment, left not enough space fill: str. ljust (width)

Get fixed length, left alignment, right side not enough space fill: str. ljust (width)

Get a fixed length and align in the middle. The two sides are not filled with spaces: str. ljust (width)

Get fixed length, right alignment

Print '% s ljust = % s' % (str, str. ljust (20 ))

Print '% s must UST = % s' % (str, str. must UST (20 ))

Print '% s center = % s' % (str, str. center (20 ))

Print '% s zfill = % s' % (str, str. zfill (20 ))

3. string search

Search for the specified string.-1: str. find ('t') is not returned ')

Search at the specified start position: str. find ('t', start)

Search by specified start and end locations: str. find ('t', start, end)

Search for str. rfind ('t') from the right ')

How many specified strings are searched: str. count ('t ')

All the methods above can be replaced by indexes. The difference is that if index is not found, an exception is thrown, while 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', 1, 2 ))

# Print '% s index nono' % (str, str. index ('nono', 1, 2 ))

Print '% s rfind t = % d' % (str, str. rfind ('t '))

Print '% s count t = % d' % (str, str. count ('t '))

4. string replacement

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

Replace the old value of a specified number of times with 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 ))

5. remove spaces from strings and specify characters

Remove space on both sides: str. strip ()

Remove left space: str. lstrip ()

Right space: str. rstrip ()

Remove the strings on both sides: str. strip ('D'). the corresponding strings include lstrip and rstrip.

Str = 'Python String function'

Print '% s strip = % s' % (str, str. strip ())

Str = 'Python String function'

Print '% s strip = % s' % (str, str. strip ('D '))

6. split the string into arrays by specified characters: str. split ('')

Separated by spaces by default

Str = 'a B c de'

Print '% s strip = % s' % (str, str. split ())

Str = 'A-B-c-de'

Print '% s strip = % s' % (str, str. split ('-'))

7. string judgment

Start or not: str. startswith ('start ')

End with: str. endswith ('end ')

Whether all are letters or numbers: str. isalnum ()

Full letter: str. isalpha ()

Full number: str. isdigit ()

Lowercase?: str. islower ()

Uppercase or not: 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 = '000000'

Print '% s isdigit = % s' % (str, str. isdigit ())