*Memos:
- My post explains a byte string.
- My post explains bytes().
- My post explains bytearray().
- My post explains a string.
You can access the byte string of a bytes literal or bytes() by indexing or slicing as shown below:
v = b'abcdefgh' v = bytes(b'abcdefgh') print(v) # b'abcdefgh' print(v[0], v[1], v[2], v[3], v[4], v[5], v[6], v[7]) print(v[-8], v[-7], v[-6], v[-5], v[-4], v[-3], v[-2], v[-1]) # 97 98 99 100 101 102 103 104 v = b'abcdefgh' v = bytes(b'abcdefgh') print(v[:]) print(v[::]) # b'abcdefgh' print(v[::2]) # b'aceg' print(v[::-2]) # b'hfdb' print(v[2:]) print(v[-6:]) print(v[2::]) print(v[-6::]) # b'cdefgh' print(v[2::2]) print(v[-6::2]) # b'ceg' print(v[2::-2]) print(v[-6::-2]) # b'ca' print(v[:6]) print(v[:-2]) print(v[:6:]) print(v[:-2:]) # b'abcdef' print(v[:6:2]) print(v[:-2:2]) # b'ace' print(v[:6:-2]) print(v[:-2:-2]) # b'h' print(v[2:6]) print(v[-6:-2]) print(v[2:6:]) print(v[-6:-2:]) # b'cdef' print(v[2:6:2]) print(v[-6:-2:2]) # b'ce' print(v[2:6:-2]) print(v[-6:-2:-2]) # b'' You cannot change the byte string of a bytes literal or bytes() because it's immutable as shown below. *A del statement can still be used to remove a variable itself:
v = b'abcdef' v = bytes(b'abcdef') v[0] = b'X' # v[-6] = b'X' v[2:6] = [b'Y', b'Z'] # TypeError: 'bytes' object does not support item assignment v = b'abcdef' v = bytes(b'abcdef') del v[0] # del v[-6] del v[3:5] # TypeError: 'bytes' object does not support item deletion v = b'abcdef' v = bytes(b'abcdef') del v print(v) # NameError: name 'v' is not defined If you really want to change the byte string of a bytes literal or bytes(), use bytearray(), ord() and bytes() as shown below.
v = b'abcdef' v = bytes(b'abcdef') v = bytearray(v) v[0] = ord(b'X') # v[-6] = ord(b'X') v[2:6] = [ord(b'Y'), ord(b'Z')] v = bytes(v) print(v) # b'XbYZ' v = b'abcdef' v = bytes(b'abcdef') v = bytearray(v) del v[0] # del v[-6] del v[3:5] v = bytes(v) print(v) # bcd In addition, if you really want to change the byte string of a bytes literal or bytes(), use list(), chr(), str.encode() and bytes.join() as shown below.
v = b'abcdef' v = bytes(b'abcdef') v = [chr(x).encode() for x in list(v)] v[0] = b'X' # v[-6] = b'X' v[2:6] = [b'Y', b'Z'] v = b''.join(v) print(v) # b'XbYZ' v = b'abcdef' v = bytes(b'abcdef') v = [chr(x).encode() for x in list(v)] del v[0] # del v[-6] del v[3:5] v = b''.join(v) print(v) # b'bcd' You can access the byte string of bytearray() by indexing or slicing as shown below:
v = bytearray(b'abcdefgh') print(v) # bytearray(b'abcdefgh') print(v[0], v[1], v[2], v[3], v[4], v[5], v[6], v[7]) print(v[-8], v[-7], v[-6], v[-5], v[-4], v[-3], v[-2], v[-1]) # 97 98 99 100 101 102 103 104 v = bytearray(b'abcdefgh') print(v[:]) print(v[::]) # bytearray(b'abcdefgh') print(v[::2]) # bytearray(b'aceg') print(v[::-2]) # bytearray(b'hfdb') print(v[2:]) print(v[-6:]) print(v[2::]) print(v[-6::]) # bytearray(b'cdefgh') print(v[2::2]) print(v[-6::2]) # bytearray(b'ceg') print(v[2::-2]) print(v[-6::-2]) # bytearray(b'ca') print(v[:6]) print(v[:-2]) print(v[:6:]) print(v[:-2:]) # bytearray(b'abcdef') print(v[:6:2]) print(v[:-2:2]) # bytearray(b'ace') print(v[:6:-2]) print(v[:-2:-2]) # bytearray(b'h') print(v[2:6]) print(v[-6:-2]) print(v[2:6:]) print(v[-6:-2:]) # bytearray(b'cdef') print(v[2:6:2]) print(v[-6:-2:2]) # bytearray(b'ce') print(v[2:6:-2]) print(v[-6:-2:-2]) # bytearray(b'') You can change the byte string of bytearray() because it's mutable as shown below. *A del statement can be used to remove a variable itself:
v = bytearray(b'abcdef') v[0] = ord(b'X') # v[-6] = ord(b'X') v[2:6] = [ord(b'Y'), ord(b'Z')] print(v) # bytearray(b'XbYZ') print(bytes(v)) # b'XbYZ' v = bytearray(b'abcdef') del v[0] # del v[-6] del v[3:5] print(v) # bytearray(b'bcd') print(bytes(v)) # b'bcd' v = bytearray(b'abcdef') del v print(v) # NameError: name 'v' is not defined 
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