The conversion between [Python] bytes and hex strings.

[Python] bytes and hex string conversion.
repeatedly played around with the assembly parsing and readable printing of code streams in several environments, always encountering hex string and bytes conversion, recorded here.

  1. on python 2.7.x (which is really hard to handle in older environments), the hex string is converted between bytes like this: 
>>> a = 'aabbccddeeff'
>>> a_bytes = a.decode('hex')
>>> print(a_bytes)
b'\xaa\xbb\xcc\xdd\xee\xff'
>>> aa = a_bytes.encode('hex')
>>> print(aa)
aabbccddeeff
>>>
  1. in python 3 environment, because the implementation of string and bytes has changed significantly, this conversion can no longer be completed with encode/decode.

2.1 before python3.5, one way of doing this conversion was to look like this: 

>>> a = 'aabbccddeeff'
>>> a_bytes = bytes.fromhex(a)
>>> print(a_bytes)
b'\xaa\xbb\xcc\xdd\xee\xff'
>>> aa = ''.join(['%02x' % b for b in a_bytes])
>>> print(aa)
aabbccddeeff
>>>

2.2 after python 3.5, you can do the following: 

>>> a = 'aabbccddeeff'
>>> a_bytes = bytes.fromhex(a)
>>> print(a_bytes)
b'\xaa\xbb\xcc\xdd\xee\xff'
>>> aa = a_bytes.hex()
>>> print(aa)
aabbccddeeff
>>>
last
data = b'\x820\xb100\x03\xc3\xb4'
print('type(data) = ', type(data))
#type(data) =  <class 'bytes'>


lst = list(data)
print(lst)
print(type(lst[0]))
#[130, 48, 177, 48, 48, 3, 195, 180]
#<class 'int'>

tmp = data.hex()

print(type(tmp), tmp)
# <class 'str'> 8230b1303003c3b4

strr = '8230b1303003c3b4'

num = bytes.fromhex(strr)

print(type(num), num)
# <class 'bytes'> b'\x820\xb100\x03\xc3\xb4'

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