#!/usr/bin/python3
"""
Program name: ASC_to_txt.py
The program's input is a string of hexadecimal digits.
The string is a bytes object, and each byte is supposed to be
the hex ASCII-code of a (capital or small) letter.
The program's output is the string of the corresponding letters.
Example
Input: 746865
First subresult: ['7','4','6','8','6','5']
Second subresult: ['0x74', '0x68', '0x65']
Third subresult: [116, 104, 101]
Final result: the
References
Contribution by alhelal to stackoverflow.com (20180901)
Contribution by QintenG to stackoverflow.com (20170104)
Mark Pilgrim, Dive into Python 3, section 4.6
"""
import string
print("The program converts a string of hex ASCII-codes")
print("into the corresponding string of letters.")
print("Input range is [41, 42, ..., 5a] U [61, 62, ..., 7a]. \n")
x = input("Input the hex ASCII-codes, eg. 746865: ")
result_1 = []
for i in range(0,len(x)//2):
for j in range(0,2):
result_1.extend(x[2*i+j])
# First subresult
lenres_1 = len(result_1)
result_2 = []
for i in range(0,len(result_1) - 1,2):
temp = ""
temp = temp + "0x" + result_1[i] #0, 2, 4
temp = temp + result_1[i + 1] #1, 3, 5
result_2.append(temp)
# Second subresult
result_3 = []
for i in range(0,len(result_2)):
result_3.append(int(result_2[i],16))
# Third subresult
by = bytes(result_3)
result_4 = by.decode('utf-8')
# Final result
print("Corresponding string of letters:" + " "*6, result_4, end = "\n")