ASCII DECODER

binlist = ['0000',
           '0001',
           '0010',
           '0011',
           '0100',
           '0101',
           '0110',
           '0111',
           '1000',
           '1001',
           '1010',
           '1011',
           '1100',
           '1101',
           '1110',
           '1111']
hexnum = "0123456789ABCDEF"
CHAR = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
char = "abcdefghijklmnopqrstuvwxyz"
num = '0123456789'
rerun = 'Y'
while rerun.upper() == 'Y':  # runs the program on a while loop until the user tells it to stop
    name = input("Enter filename of test file: ")  # where the user will input the name of the file
    with open(f'{name}.txt', 'r') as file:  # opens the file inputted by the user
        data = file.read().replace('\n', '')  # converts the textfile into string and removes the newlines
    print(f'binary: {data}')  # first prints out whatever is on the file
    hex = []
    count = 0  # initialization of variables for the binary to hexadecimal part
    a = 0
    b = 4
    error = 0
    while error != 1:  # while loop that reads each binary number per 4 digits and converts it into a hexadecimal equivalent
        count += 1
        if data[a:b] == binlist[1]:
            hex.append(hexnum[1])
        elif data[a:b] == binlist[2]:
            hex.append(hexnum[2])
        elif data[a:b] == binlist[3]:
            hex.append(hexnum[3])
        elif data[a:b] == binlist[4]:
            hex.append(hexnum[4])
        elif data[a:b] == binlist[5]:
            hex.append(hexnum[5])
        elif data[a:b] == binlist[6]:
            hex.append(hexnum[6])
        elif data[a:b] == binlist[7]:
            hex.append(hexnum[7])
        elif data[a:b] == binlist[8]:
            hex.append(hexnum[8])
        elif data[a:b] == binlist[9]:
            hex.append(hexnum[9])
        elif data[a:b] == binlist[10]:
            hex.append(hexnum[10])
        elif data[a:b] == binlist[11]:
            hex.append(hexnum[11])
        elif data[a:b] == binlist[12]:
            hex.append(hexnum[12])
        elif data[a:b] == binlist[13]:
            hex.append(hexnum[13])
        elif data[a:b] == binlist[14]:
            hex.append(hexnum[14])
        elif data[a:b] == binlist[15]:
            hex.append(hexnum[15])
        elif data[a:b] == binlist[0]:
            hex.append(hexnum[0])
        else:
            error = 1
        a += 4
        b += 4
    c = 0  # initialization of variables for the hexadecimal to character part
    d = 2
    error2 = 0
    hexanum = "".join(hex)  # joins the hexadecimal array into a single string
    print(f'hex number: {hexanum}')
    text = []
    hexanum = str(hexanum)
    while error2 != 1:  # while loop that reads each hexadecimal by 2 digits and converts that into a character
        count += 1
        if hexanum[c:d] == '30':
            text.append(num[0])
        elif hexanum[c:d] == '20':
            text.append(' ')
        elif hexanum[c:d] == '31':
            text.append(num[1])
        elif hexanum[c:d] == '32':
            text.append(num[2])
        elif hexanum[c:d] == '33':
            text.append(num[3])
        elif hexanum[c:d] == '34':
            text.append(num[4])
        elif hexanum[c:d] == '35':
            text.append(num[5])
        elif hexanum[c:d] == '36':
            text.append(num[6])
        elif hexanum[c:d] == '37':
            text.append(num[7])
        elif hexanum[c:d] == '38':
            text.append(num[8])
        elif hexanum[c:d] == '39':
            text.append(num[9])
        elif hexanum[c:d] == '41':
            text.append(CHAR[0])
        elif hexanum[c:d] == '42':
            text.append(CHAR[1])
        elif hexanum[c:d] == '43':
            text.append(CHAR[2])
        elif hexanum[c:d] == '44':
            text.append(CHAR[3])
        elif hexanum[c:d] == '45':
            text.append(CHAR[4])
        elif hexanum[c:d] == '46':
            text.append(CHAR[5])
        elif hexanum[c:d] == '47':
            text.append(CHAR[6])
        elif hexanum[c:d] == '48':
            text.append(CHAR[7])
        elif hexanum[c:d] == '49':
            text.append(CHAR[8])
        elif hexanum[c:d] == '4A':
            text.append(CHAR[9])
        elif hexanum[c:d] == '4B':
            text.append(CHAR[10])
        elif hexanum[c:d] == '4C':
            text.append(CHAR[11])
        elif hexanum[c:d] == '4D':
            text.append(CHAR[12])
        elif hexanum[c:d] == '4E':
            text.append(CHAR[13])
        elif hexanum[c:d] == '4F':
            text.append(CHAR[14])
        elif hexanum[c:d] == '50':
            text.append(CHAR[15])
        elif hexanum[c:d] == '51':
            text.append(CHAR[16])
        elif hexanum[c:d] == '52':
            text.append(CHAR[17])
        elif hexanum[c:d] == '53':
            text.append(CHAR[18])
        elif hexanum[c:d] == '54':
            text.append(CHAR[19])
        elif hexanum[c:d] == '55':
            text.append(CHAR[20])
        elif hexanum[c:d] == '56':
            text.append(CHAR[21])
        elif hexanum[c:d] == '57':
            text.append(CHAR[22])
        elif hexanum[c:d] == '58':
            text.append(CHAR[23])
        elif hexanum[c:d] == '59':
            text.append(CHAR[24])
        elif hexanum[c:d] == '5A':
            text.append(CHAR[25])
        elif hexanum[c:d] == '61':
            text.append(char[0])
        elif hexanum[c:d] == '62':
            text.append(char[1])
        elif hexanum[c:d] == '63':
            text.append(char[2])
        elif hexanum[c:d] == '64':
            text.append(char[3])
        elif hexanum[c:d] == '65':
            text.append(char[4])
        elif hexanum[c:d] == '66':
            text.append(char[5])
        elif hexanum[c:d] == '67':
            text.append(char[6])
        elif hexanum[c:d] == '68':
            text.append(char[7])
        elif hexanum[c:d] == '69':
            text.append(char[8])
        elif hexanum[c:d] == '6A':
            text.append(char[9])
        elif hexanum[c:d] == '6B':
            text.append(char[10])
        elif hexanum[c:d] == '6C':
            text.append(char[11])
        elif hexanum[c:d] == '6D':
            text.append(char[12])
        elif hexanum[c:d] == '6E':
            text.append(char[13])
        elif hexanum[c:d] == '6F':
            text.append(char[14])
        elif hexanum[c:d] == '70':
            text.append(char[15])
        elif hexanum[c:d] == '71':
            text.append(char[16])
        elif hexanum[c:d] == '72':
            text.append(char[17])
        elif hexanum[c:d] == '73':
            text.append(char[18])
        elif hexanum[c:d] == '73':
            text.append(char[19])
        elif hexanum[c:d] == '74':
            text.append(char[19])
        elif hexanum[c:d] == '75':
            text.append(char[20])
        elif hexanum[c:d] == '76':
            text.append(char[21])
        elif hexanum[c:d] == '77':
            text.append(char[22])
        elif hexanum[c:d] == '78':
            text.append(char[23])
        elif hexanum[c:d] == '79':
            text.append(char[24])
        elif hexanum[c:d] == '7A':
            text.append(char[25])
        elif hexanum[c:d] == '3B':
            text.append(';')
        else:
            error2 = 1
        c += 2
        d += 2
    text = "".join(text)  # joins the character array into a single string
    print('')
    print(f'Converted ASCII: {text}')  # prints out the final converted text
    print('')
    rerun = input('Do you want to run the program again?'
                  ' Press Y for yes. Press any other key for no : ')