Posted on Aug 3 • Edited on Sep 14

rsplit in Python

*Memo for string, bytes and bytearray functions:

My post explains split().
My post explains splitlines().
My post explains partition().
My post explains rpartition().
My post explains join().

*Memo for a string, bytes and bytearray:

My post explains a string.
My post explains a bytes.
My post explains a bytearray.

str.rsplit() and bytes.rsplit() or bytearray.rsplit() can split the string and bytes or bytearray respectively from the right to the left as shown below:

*Memo:

The 1st argument is sep(Optional-Default:None-Type:str for str.rsplit(), Bytes-like object for bytes.rsplit() and bytearray.rsplit() or NoneType):
- It's the delimiter of the one or more characters and bytes to delimit a string and bytes or bytearray respectively.
- An empty string and bytes or bytearray cannot be set respectively.
The 2nd argument is maxsplit(Optional-Default:-1-Type:int):
- It decides how many splits are made.
- If it's not set or -1, then all possible splits are made.
If sep is set, consecutive delimiters aren't grouped together and are deemed to delimit empty strings and bytes or bytearray respectively:
- For example, '1,,,2'.rsplit(sep=',') returns ['1', '', '', '2'] and b'1,,,2'.rsplit(sep=b',') returns [b'1', b'', b'', b'2'].

<String>:

v = 'one two three four\nfive\tsix' # ↑ ↑↑ ↑↑↑ print(v) # one two three four # five six  print(v.rsplit()) print(v.rsplit(sep=None, maxsplit=-1)) # ['one', 'two', 'three', 'four', 'five', 'six']  print(v.rsplit(maxsplit=0)) # ['one two three four\nfive\tsix']  print(v.rsplit(maxsplit=1)) # ['one two three four\nfive', 'six']  print(v.rsplit(maxsplit=2)) # ['one two three four', 'five', 'six']  print(v.rsplit(maxsplit=3)) # ['one two three', 'four', 'five', 'six']  print(v.rsplit(maxsplit=4)) # ['one two', 'three', 'four', 'five', 'six']  print(v.rsplit(maxsplit=5)) # ['one', 'two', 'three', 'four', 'five', 'six']  # ↓ print(v.rsplit(sep=' ')) # ['one', 'two', '', 'three', '', '', 'four\nfive\tsix']  # ↓↓ print(v.rsplit(sep=' ')) # ['one two', 'three ', 'four\nfive\tsix']  # ↓↓↓ print(v.rsplit(sep=' ')) # ['one two three', 'four\nfive\tsix']  # ↓↓↓↓ print(v.rsplit(sep=' ')) # ['one two three four\nfive\tsix']  print(v.rsplit(sep='')) # ValueError: empty separator

v = 'one-two--three---four-=*!five-=*!?six' # ↑ ↑↑ ↑↑↑ ↑↑↑↑ ↑↑↑↑↑ print(v) # one-two--three---four-=*!five-=*!?six  print(v.rsplit()) # ['one-two--three---four-=*!five-=*!?six']  # ↓ print(v.rsplit(sep='-')) # ['one', 'two', '', 'three', '', '', 'four', '=*!five', '=*!?six']  # ↓↓ print(v.rsplit(sep='--')) # ['one-two', 'three-', 'four-=*!five-=*!?six']  # ↓↓↓ print(v.rsplit(sep='---')) # ['one-two--three', 'four-=*!five-=*!?six']  # ↓↓↓ print(v.rsplit(sep='-=*')) # ['one-two--three---four', '!five', '!?six']

v = '' print(v.rsplit()) # []  print(v.rsplit(sep=' ')) print(v.rsplit(sep='-')) # ['']

<Bytes & Bytearray>:

bytes:

v = b'one two three four\nfive\tsix' # ↑ ↑↑ ↑↑↑ print(v) # b'one two three four\nfive\tsix'  print(v.rsplit()) print(v.rsplit(sep=None, maxsplit=-1)) # [b'one', b'two', b'three', b'four', b'five', b'six']  print(v.rsplit(maxsplit=0)) # [b'one two three four\nfive\tsix']  print(v.rsplit(maxsplit=1)) # [b'one two three four\nfive', b'six']  print(v.rsplit(maxsplit=2)) # [b'one two three four', b'five', b'six']  print(v.rsplit(maxsplit=3)) # [b'one two three', b'four', b'five', b'six']  print(v.rsplit(maxsplit=4)) # [b'one two', b'three', b'four', b'five', b'six']  print(v.rsplit(maxsplit=5)) # [b'one', b'two', b'three', b'four', b'five', b'six']  # ↓ print(v.rsplit(sep=b' ')) print(v.rsplit(sep=bytearray(b' '))) # [b'one', b'two', b'', b'three', b'', b'', b'four\nfive\tsix']  # ↓↓ print(v.rsplit(sep=b' ')) print(v.rsplit(sep=bytearray(b' '))) # [b'one two', b'three ', b'four\nfive\tsix']  # ↓↓↓ print(v.rsplit(sep=b' ')) print(v.rsplit(sep=bytearray(b' '))) # [b'one two three', b'four\nfive\tsix']  # ↓↓↓↓ print(v.rsplit(sep=b' ')) print(v.rsplit(sep=bytearray(b' '))) # [b'one two three four\nfive\tsix']  print(v.rsplit(sep=b'')) print(v.rsplit(sep=bytearray(b''))) # ValueError: empty separator

v = b'one-two--three---four-=*!five-=*!?six' # ↑ ↑↑ ↑↑↑ ↑↑↑↑ ↑↑↑↑↑ print(v) # b'one-two--three---four-=*!five-=*!?six'  print(v.rsplit()) # [b'one-two--three---four-=*!five-=*!?six']  # ↓ print(v.rsplit(sep=b'-')) print(v.rsplit(sep=bytearray(b'-'))) # [b'one', b'two', b'', b'three', b'', b'', b'four', b'=*!five', b'=*!?six']  # ↓↓ print(v.rsplit(sep=b'--')) print(v.rsplit(sep=bytearray(b'--'))) # [b'one-two', b'three-', b'four-=*!five-=*!?six']  # ↓↓↓ print(v.rsplit(sep=b'---')) print(v.rsplit(sep=bytearray(b'---'))) # [b'one-two--three', b'four-=*!five-=*!?six']  # ↓↓↓ print(v.rsplit(sep=b'-=*')) print(v.rsplit(sep=bytearray(b'-=*'))) # [b'one-two--three---four', b'!five', b'!?six']

v = '' print(v.rsplit()) # []  print(v.rsplit(sep=b' ')) print(v.rsplit(sep=bytearray(b' '))) print(v.rsplit(sep=b'-')) print(v.rsplit(sep=bytearray(b'-'))) # [b'']

bytearray:

v = bytearray(b'one two three four\nfive\tsix') # ↑ ↑↑ ↑↑↑ print(v) # bytearray(b'one two three four\nfive\tsix')  print(v.rsplit()) print(v.rsplit(sep=None, maxsplit=-1)) # [bytearray(b'one'), bytearray(b'two'), bytearray(b'three'), # bytearray(b'four'), bytearray(b'five'), bytearray(b'six')]  print(v.rsplit(maxsplit=0)) # [bytearray(b'one two three four\nfive\tsix')]  print(v.rsplit(maxsplit=1)) # [bytearray(b'one two three four\nfive'), bytearray(b'six')]  print(v.rsplit(maxsplit=2)) # [bytearray(b'one two three four'), bytearray(b'five'), # bytearray(b'six')]  print(v.rsplit(maxsplit=3)) # [bytearray(b'one two three'), bytearray(b'four'), bytearray(b'five'), # bytearray(b'six')]  print(v.rsplit(maxsplit=4)) # [bytearray(b'one two'), bytearray(b'three'), bytearray(b'four'), # bytearray(b'five'), bytearray(b'six')]  print(v.rsplit(maxsplit=5)) # [bytearray(b'one'), bytearray(b'two'), bytearray(b'three'), # bytearray(b'four'), bytearray(b'five'), bytearray(b'six')]  # ↓ print(v.rsplit(sep=b' ')) print(v.rsplit(sep=bytearray(b' '))) # [bytearray(b'one'), bytearray(b'two'), bytearray(b''), # bytearray(b'three'), bytearray(b''), bytearray(b''), # bytearray(b'four\nfive\tsix')]  # ↓↓ print(v.rsplit(sep=b' ')) print(v.rsplit(sep=bytearray(b' '))) # [bytearray(b'one two'), bytearray(b'three '), # bytearray(b'four\nfive\tsix')]  # ↓↓↓ print(v.rsplit(sep=b' ')) print(v.rsplit(sep=bytearray(b' '))) # [bytearray(b'one two three'), bytearray(b'four\nfive\tsix')]  # ↓↓↓↓ print(v.rsplit(sep=b' ')) print(v.rsplit(sep=bytearray(b' '))) # [bytearray(b'one two three four\nfive\tsix')]  print(v.rsplit(sep=b'')) print(v.rsplit(sep=bytearray(b''))) # ValueError: empty separator

v = bytearray(b'one-two--three---four-=*!five-=*!?six') # ↑ ↑↑ ↑↑↑ ↑↑↑↑ ↑↑↑↑↑ print(v) # bytearray(b'one-two--three---four-=*!five-=*!?six')  print(v.rsplit()) # [bytearray(b'one-two--three---four-=*!five-=*!?six')]  # ↓ print(v.rsplit(sep=b'-')) print(v.rsplit(sep=bytearray(b'-'))) # [bytearray(b'one'), bytearray(b'two'), bytearray(b''), # bytearray(b'three'), bytearray(b''), bytearray(b''), # bytearray(b'four'), bytearray(b'=*!five'), bytearray(b'=*!?six')]  # ↓↓ print(v.rsplit(sep=b'--')) print(v.rsplit(sep=bytearray(b'--'))) # [bytearray(b'one-two'), bytearray(b'three-'), # bytearray(b'four-=*!five-=*!?six')]  # ↓↓↓ print(v.rsplit(sep=b'---')) print(v.rsplit(sep=bytearray(b'---'))) # [bytearray(b'one-two--three'), bytearray(b'four-=*!five-=*!?six')]  # ↓↓↓ print(v.rsplit(sep=b'-=*')) print(v.rsplit(sep=bytearray(b'-=*'))) # [bytearray(b'one-two--three---four'), bytearray(b'!five'), # bytearray(b'!?six')]

v = bytearray(b'') print(v.rsplit()) # []  print(v.rsplit(sep=b' ')) print(v.rsplit(sep=bytearray(b' '))) print(v.rsplit(sep=b'-')) print(v.rsplit(sep=bytearray(b'-'))) # [bytearray(b'')]

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rsplit in Python

<String>:

<Bytes & Bytearray>:

bytes:

bytearray:

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