HexToBin.py

#Hexadecimal to Binary conversion without any imports
hexnumbers = list('0123456789abcdef')
binnumbers = ('0000','0001','0010','0011','0100','0101','0110','0111','1000','1001','1010','1011','1100','1101','1110','1111')
print('Hexadecimal numbers are: ', hexnumbers)
userinput = input('Enter any hexadecimal number: ')
i = 0
result = ''
while i != len(userinput):
    if userinput[i] not in hexnumbers:
        print('What the fuck? I actually asked for hex numbers only')
        exit()
    else:
        result += str(binnumbers[(hexnumbers.index(userinput[i]))]) + ' '
        i += 1

print(result)