*Memo for string, bytes and bytearray functions:
- My post explains split().
- My post explains rsplit().
- My post explains splitlines().
- My post explains rpartition().
- My post explains join().
*Memo for a string, bytes and bytearray:
str.partition() and bytes.partition() or bytearray.partition() can split the string and bytes or bytearray respectively at the 1st occurrence of a separator, searching from the left to the right as shown below:
*Memo:
- The 1st argument is
sep(Required-Type:strforstr.partition()or Bytes-like object forbytes.partition()andbytearray.partition()):- 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
sepisn't found, a tuple of the original string and two empty strings in order and the original bytes or bytearray and two empty bytes or bytearray in order are returned as 3 elements respectively.
<String>:
v = "It's very very good" print(v.partition('er')) # ("It's v", 'er', 'y very good') print(v.partition('very')) # ("It's ", 'very', ' very good') # ↓ print(v.partition(' ')) # ("It's", ' ', 'very very good') # ↓↓ print(v.partition(' ')) print(v.partition('ER')) print(v.partition('VERY')) print(v.partition('really')) # ("It's very very good", '', '') print(v.partition('')) # ValueError: empty separator v = '' print(v.partition('er')) # ('', '', '') <Bytes & Bytearray>:
bytes:
v = b"It's very very good" print(v.partition(b'er')) # (b"It's v", b'er', b'y very good') print(v.partition(bytearray(b'er'))) # (b"It's v", bytearray(b'er'), b'y very good') print(v.partition(b'very')) # (b"It's ", b'very', b' very good') print(v.partition(bytearray(b'very'))) # (b"It's ", bytearray(b'very'), b' very good') # ↓ print(v.partition(b' ')) # (b"It's", b' ', b'very very good') print(v.partition(bytearray(b' '))) # (b"It's", bytearray(b' '), b'very very good') # ↓↓ print(v.partition(b' ')) print(v.partition(bytearray(b' '))) print(v.partition(b'ER')) print(v.partition(bytearray(b'ER'))) print(v.partition(b'VERY')) print(v.partition(bytearray(b'VERY'))) print(v.partition(b'really')) print(v.partition(bytearray(b'really'))) # ("It's very very good", '', '') print(v.partition(b'')) print(v.partition(bytearray(b''))) # ValueError: empty separator v = b'' print(v.partition(b'er')) print(v.partition(bytearray(b'er'))) # (b'', b'', b'') bytearray:
v = bytearray(b"It's very very good") print(v.partition(b'er')) print(v.partition(bytearray(b'er'))) # (bytearray(b"It\'s v"), bytearray(b'er'), bytearray(b'y very good')) print(v.partition(b'very')) print(v.partition(bytearray(b'very'))) # (bytearray(b"It\'s "), bytearray(b'very'), bytearray(b' very good')) # ↓ print(v.partition(b' ')) print(v.partition(bytearray(b' '))) # (bytearray(b"It\'s"), bytearray(b' '), bytearray(b'very very good')) # ↓↓ print(v.partition(b' ')) print(v.partition(bytearray(b' '))) print(v.partition(b'ER')) print(v.partition(bytearray(b'ER'))) print(v.partition(b'VERY')) print(v.partition(bytearray(b'VERY'))) print(v.partition(b'really')) print(v.partition(bytearray(b'really'))) # (bytearray(b"It\'s very very good"), bytearray(b''), bytearray(b'')) print(v.partition(b'')) print(v.partition(bytearray(b''))) # ValueError: empty separator v = bytearray(b'') print(v.partition(b'er')) print(v.partition(bytearray(b'er'))) # (bytearray(b''), bytearray(b''), bytearray(b'')) 
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