rpartition in Python

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*Memo for string, bytes and bytearray functions:

• My post explains split().
• My post explains rsplit().
• My post explains splitlines().
• My post explains partition().
• 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.rpartition() and bytes.rpartition() or bytearray.rpartition() can split the string and bytes or bytearray respectively at the 1st occurrence of a separator, searching from the right to the left as shown below:

*Memo:

• The 1st argument is sep(Required-Type:str for str.rpartition() or Bytes-like object for bytes.rpartition() and bytearray.rpartition()):
  • It's the separator of the one or more characters and bytes to separate a string and bytes or bytearray respectively.
  • An empty string and bytes or bytearray cannot be set respectively.
  • Don't use sep=.
• It returns a tuple of 3 elements.
• If sep isn't found, a tuple of two empty strings and the original string in order and two empty bytes or bytearray and the original bytes or bytearray in order are returned as 3 elements respectively.

<String>:

v = "It's very very good"

print(v.rpartition('er'))
# ("It's very v", 'er', 'y good')

print(v.rpartition('very'))
# ("It's very ", 'very', ' good')

                  # ↓
print(v.rpartition(' '))
# ("It's very very", ' ', 'good')

                  # ↓↓
print(v.rpartition('  '))
print(v.rpartition('ER'))
print(v.rpartition('VERY'))
print(v.rpartition('really'))
# ('', '', "It's very very good")

print(v.rpartition(''))
# ValueError: empty separator

v = ''

print(v.rpartition('er'))
# ('', '', '')

<Bytes & Bytearray>:

bytes:

v = b"It's very very good"

print(v.rpartition(b'er'))
# (b"It's very v", b'er', b'y good')

print(v.rpartition(bytearray(b'er')))
# (b"It's very v", bytearray(b'er'), b'y good')

print(v.rpartition(b'very'))
# (b"It's very ", b'very', b' good')

print(v.rpartition(bytearray(b'very')))
# (b"It's very ", bytearray(b'very'), b' good')

                   # ↓
print(v.rpartition(b' '))
# (b"It's very very", b' ', b'good')

print(v.rpartition(bytearray(b' ')))
# (b"It's very very", bytearray(b' '), b'good')

                   # ↓↓
print(v.rpartition(b'  '))
print(v.rpartition(bytearray(b'  ')))
print(v.rpartition(b'ER'))
print(v.rpartition(bytearray(b'ER')))
print(v.rpartition(b'VERY'))
print(v.rpartition(bytearray(b'VERY')))
print(v.rpartition(b'really'))
print(v.rpartition(bytearray(b'really')))
# ('', '', "It's very very good")

print(v.rpartition(b''))
print(v.rpartition(bytearray(b'')))
# ValueError: empty separator

v = b''

print(v.rpartition(b'er'))
print(v.rpartition(bytearray(b'er')))
# (b'', b'', b'')

bytearray:

v = bytearray(b"It's very very good")

print(v.rpartition(b'er'))
print(v.rpartition(bytearray(b'er')))
# (bytearray(b"It\'s very v"), bytearray(b'er'), bytearray(b'y good'))

print(v.rpartition(b'very'))
print(v.rpartition(bytearray(b'very')))
# (bytearray(b"It\'s very "), bytearray(b'very'), bytearray(b' good'))

                   # ↓
print(v.rpartition(b' '))
print(v.rpartition(bytearray(b' ')))
# (bytearray(b"It\'s very very"), bytearray(b' '), bytearray(b'good'))

                   # ↓↓
print(v.rpartition(b'  '))
print(v.rpartition(bytearray(b'  ')))
print(v.rpartition(b'ER'))
print(v.rpartition(bytearray(b'ER')))
print(v.rpartition(b'VERY'))
print(v.rpartition(bytearray(b'VERY')))
print(v.rpartition(b'really'))
print(v.rpartition(bytearray(b'really')))
# (bytearray(b''), bytearray(b''), bytearray(b"It\'s very very good"))

print(v.rpartition(b''))
print(v.rpartition(bytearray(b'')))
# ValueError: empty separator

v = bytearray(b'')

print(v.rpartition(b'er'))
print(v.rpartition(bytearray(b'er')))
# (bytearray(b''), bytearray(b''), bytearray(b''))