python3_pyserial_hex.py

import serial

FLAG = 0x7E
HEX_NUMBER = 0xFF
HEX_NUMBERS = [0xFF, 0x15]

# INT <---> STRING(hex)
print(FLAG, type(FLAG))  # 126 <class 'int'>
print(hex(FLAG), type(hex(FLAG)))  # 0x7e <class 'str'>
print(int(hex(FLAG), 16))  # 126

# Addition two hex number
print(FLAG+HEX_NUMBER)  # 381

# Sum hex number list
print(sum(HEX_NUMBERS))  # 276

# Get sum hex string and get last byte
hex_sum = hex(sum(HEX_NUMBERS))
print(hex_sum, type(hex_sum))  # 0x114 <class 'str'>
print(hex_sum[:2] + hex_sum[-2:])  # 0x14

# Use serial.to_bytes function transfer hex sequence into byte string
b_string = serial.to_bytes(HEX_NUMBERS)
print(b_string, type(b_string))  # b'\xff\x15' <class 'bytes'>
# Convert byte string to hex string
print(b_string.hex(), type(b_string.hex()))  # ff15 <class 'str'>

# ASCII string to hex number
# Ref: https://stackoverflow.com/questions/8088375/how-do-i-convert-a-single-character-into-its-hex-ascii-value-in-python
print(hex(ord("c")))  # '0x63'