replace in Python

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*Memo for string, bytes and bytearray functions:

• My post explains removeprefix() and removesuffix().
• My post explains startswith().
• My post explains endswith().

*Memo for a string, bytes and bytearray:

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

str.replace() and bytes.replace() or bytearray.replace() can replace the zero or more substrings and byte substrings respectively matched to old with new from the left to the right as shown below:

*Memo:

• The 1st argument is old(Required-Type:str for str.replace() or Bytes-like object for bytes.replace() and bytearray.replace()):
  • It's the substring and byte substring of the zero or more characters and bytes replaced with new respectively.
  • Don't use old=.
• The 2nd argument is new(Required-Type:str for str.replace() or Bytes-like object for bytes.replace() and bytearray.replace()):
  • It's the substring and byte substring of the zero or more characters and bytes replacing old respectively.
  • Don't use old=.
• The 3rd argument is count(Optional-Default:-1-Type:int):
  • It decides how many matched substrings and byte substrings are replaced respectively.
  • If it's -1, all old substrings and byte substrings are replaced respectively.
  • Don't use count=.

<String>:

v = "It's very very good"

print(v.replace('er', 'ER'))
print(v.replace('er', 'ER', -1))
print(v.replace('er', 'ER', 2))
# It's vERy vERy good

print(v.replace('er', 'ER', 1))
# It's vERy very good

print(v.replace('very', 'VERY'))
print(v.replace('very', 'VERY', 2))
# It's VERY VERY good

print(v.replace('very', 'VERY', 1))
# It's VERY very good

print(v.replace('', '--'))
# --I--t--'--s-- --v--e--r--y-- --v--e--r--y-- --g--o--o--d--

                   # ↓↓
print(v.replace('', '  '))
#   I  t  '  s     v  e  r  y     v  e  r  y     g  o  o  d  

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

               # ↓↓    ↓↓
print(v.replace('  ', '  '))
print(v.replace('', ''))
print(v.replace('er', 'ER', 0))
print(v.replace('very', 'VERY', 0))
print(v.replace('ER', 'ER'))
print(v.replace('VERY', 'VERY'))
print(v.replace('really', 'VERY'))
# It's very very good

<Bytes & Bytearray>:

bytes:

v = b"It's very very good"

print(v.replace(b'er', b'ER'))
print(v.replace(bytearray(b'er'), bytearray(b'ER')))
print(v.replace(b'er', b'ER', -1))
print(v.replace(bytearray(b'er'), bytearray(b'ER'), -1))
print(v.replace(b'er', b'ER', 2))
print(v.replace(bytearray(b'er'), bytearray(b'ER'), 2))
# b"It's vERy vERy good"

print(v.replace(b'er', b'ER', 1))
print(v.replace(bytearray(b'er'), bytearray(b'ER'), 1))
# b"It's vERy very good"

print(v.replace(b'very', b'VERY'))
print(v.replace(bytearray(b'very'), bytearray(b'VERY')))
print(v.replace(b'very', b'VERY', 2))
print(v.replace(bytearray(b'very'), bytearray(b'VERY'), 2))
# b"It's VERY VERY good"

print(v.replace(b'very', b'VERY', 1))
print(v.replace(bytearray(b'very'), bytearray(b'VERY'), 1))
# b"It's VERY very good"

print(v.replace(b'', b'--'))
print(v.replace(bytearray(b''), bytearray(b'--')))
# b"--I--t--'--s-- --v--e--r--y-- --v--e--r--y-- --g--o--o--d--"

                     # ↓↓
print(v.replace(b'', b'  '))
print(v.replace(bytearray(b''), bytearray(b'  ')))
# b"  I  t  '  s     v  e  r  y     v  e  r  y     g  o  o  d  "

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

                # ↓↓     ↓↓
print(v.replace(b'  ', b'  '))
print(v.replace(bytearray(b'  '), bytearray(b'  ')))
print(v.replace(b'', b''))
print(v.replace(bytearray(b''), bytearray(b'')))
print(v.replace(b'er', b'ER', 0))
print(v.replace(bytearray(b'er'), bytearray(b'ER'), 0))
print(v.replace(b'very', b'VERY', 0))
print(v.replace(bytearray(b'very'), bytearray(b'VERY'), 0))
print(v.replace(b'ER', b'ER'))
print(v.replace(bytearray(b'ER'), bytearray(b'ER')))
print(v.replace(b'VERY', b'VERY'))
print(v.replace(bytearray(b'VERY'), bytearray(b'VERY')))
print(v.replace(b'really', b'VERY'))
print(v.replace(bytearray(b'really'), bytearray(b'VERY')))
# b"It's very very good"

bytearray:

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

print(v.replace(b'er', b'ER'))
print(v.replace(bytearray(b'er'), bytearray(b'ER')))
print(v.replace(b'er', b'ER', -1))
print(v.replace(bytearray(b'er'), bytearray(b'ER'), -1))
print(v.replace(b'er', b'ER', 2))
print(v.replace(bytearray(b'er'), bytearray(b'ER'), 2))
# bytearray(b"It\'s vERy vERy good")

print(v.replace(b'er', b'ER', 1))
print(v.replace(bytearray(b'er'), bytearray(b'ER'), 1))
# bytearray(b"It\'s vERy very good")

print(v.replace(b'very', b'VERY'))
print(v.replace(bytearray(b'very'), bytearray(b'VERY')))
print(v.replace(b'very', b'VERY', 2))
print(v.replace(bytearray(b'very'), bytearray(b'VERY'), 2))
# bytearray(b"It\'s VERY VERY good")

print(v.replace(b'very', b'VERY', 1))
print(v.replace(bytearray(b'very'), bytearray(b'VERY'), 1))
# bytearray(b"It\'s VERY very good")

print(v.replace(b'', b'--'))
print(v.replace(bytearray(b''), bytearray(b'--')))
# bytearray(b"--I--t--\'--s-- --v--e--r--y-- --v--e--r--y-- --g--o--o--d--")
                     # ↓↓
print(v.replace(b'', b'  '))
print(v.replace(bytearray(b''), bytearray(b'  ')))
# bytearray(b"  I  t  \'  s     v  e  r  y     v  e  r  y     g  o  o  d  ")
                # ↓     ↓↓
print(v.replace(b' ', b'  '))
print(v.replace(bytearray(b' '), bytearray(b'  ')))
# bytearray(b"It\'s  very  very  good")

                # ↓↓     ↓↓
print(v.replace(b'  ', b'  '))
print(v.replace(bytearray(b'  '), bytearray(b'  ')))
print(v.replace(b'', b''))
print(v.replace(bytearray(b''), bytearray(b'')))
print(v.replace(b'er', b'ER', 0))
print(v.replace(bytearray(b'er'), bytearray(b'ER'), 0))
print(v.replace(b'very', b'VERY', 0))
print(v.replace(bytearray(b'very'), bytearray(b'VERY'), 0))
print(v.replace(b'ER', b'ER'))
print(v.replace(bytearray(b'ER'), bytearray(b'ER')))
print(v.replace(b'VERY', b'VERY'))
print(v.replace(bytearray(b'VERY'), bytearray(b'VERY')))
print(v.replace(b'really', b'VERY'))
print(v.replace(bytearray(b'really'), bytearray(b'VERY')))
# bytearray(b"It\'s very very good")