replace in Python

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*Memo for a string and byte string(bytes and bytearray) functions:

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

*Memo for a string and byte string(bytes and bytearray):

• My post explains a string.
• My post explains a byte string.

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

<Byte String>:

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")