Python function to convert Binary digit to Hexadecimal

Question

I have another problem with a program that converts binary digits to hexadecimal. I have the program that runs well but displays the hexadecimal digit in small caps though the answer is required to be in caps as shown in the question and sample run

This is my code

def binaryToHex(binaryValue):
#convert binaryValue to decimal

decvalue = 0
for i in range(len(binaryValue)):
    digit = binaryValue.pop()
    if digit == '1':
        decvalue = decvalue + pow(2, i)

#convert decimal to hexadecimal
hexadecimal=hex(decvalue)
return hexadecimal
def main():
  binaryValue = list(input("Input a binary number: "))
  hexval=binaryToHex(binaryValue)

  hexa=h1.capitalize() #Tried to use capitalize() function but didn't worl
  print("The hex value is",hexa[ 2:4]) #strips off the first 2 digits
main()

This is what is displayed when I run

umm hexa[ 2:4] doesn't just strip off the first two digits... that'd be [2:]... also, I take it though this is an exercise of some sort and you're not allowed to just use: format(int(binaryValue, 2), 'X') ? — Jon Clements
– Jon Clements, Commented Mar 21, 2019 at 7:55
@JonClements I don't think there is any restriction for that. I can use it — PatienceMuthoki
– PatienceMuthoki, Commented Mar 21, 2019 at 8:05

Jon Clements · Accepted Answer · 2019-03-21 08:33:04Z

1

Since this comes up a fair bit - here's an answer that's fairly Pythonic and hopefully serves as a canonical reference for future questions.

First off, just keep the input as a string:

binary_value = input('Enter a binary number: ')

Then use the builtin int with a base argument of 2 (which indicates to interpret the string as binary digits) to get an integer from your string:

number = int(binary_value, 2)
# 10001111 -> 143

Then you can use an f-string to print your number with a format specifier X which means in "hex with upper case letters and no prefix":

print(f'The hex value is {number:X}')

Your entire code base would then be something like (sticking with two-functions and your naming conventions):

def binaryToHex(binaryValue):
    number = int(binaryValue, 2)
    return format(number, 'X')

def main():
    binaryValue = input('Enter a binary number: ')
    print('The hex value is', binaryToHex(binaryValue))

main()

edited Mar 21, 2019 at 8:33

answered Mar 21, 2019 at 8:09

Jon Clements

143k34 gold badges254 silver badges288 bronze badges

Sign up to request clarification or add additional context in comments.

4 Comments

PatienceMuthoki Over a year ago

I have changed my code to def binaryToHex(binaryValue): decvalue=int(binaryValue,2) hexadecimal=hex(decvalue) return hexadecimal def main(): binaryValue = input("Input a binary number: ") hexval=binaryToHex(binaryValue) hexa=hexval.upper() print(f'The hex value is {hexval:X}') main()

PatienceMuthoki Over a year ago

I get an error that unknown format code 'X' for object of type 'str'

Jon Clements Over a year ago

@PatienceMuthoki Yes... because you want don't want to do any other string conversations, you literally want to print the int you get with the format specifier X and it does all that for you. You literally only need the 3 lines above... you don't need to do anything else with hex or anything.

Jon Clements Over a year ago

So 1) get the input, 2) convert it to an integer, 3) print that number with the format specifier

Sridhar Murali · Accepted Answer · 2019-03-21 07:52:11Z

0

One mistake you've made is h1 does not exist in the code and yet it's present.

.upper() on a string changes it to uppercase

def main():
    binaryValue = list(input("Input a binary number: "))
    hexval=binaryToHex(binaryValue)
    hexa=hexval.upper() 
    print("The hex value is",hexa[ 2:4]) #strips off the first 2 digits

output:

Input a binary number: 10001111
The hex value is 8F

answered Mar 21, 2019 at 7:52

Sridhar Murali

3901 silver badge11 bronze badges

2 Comments

PatienceMuthoki Over a year ago

Thanks it has worked on my local machine though the program used for marking indicates an error that what the standard output isn't what was expected

Sridhar Murali Over a year ago

Could you post the error message. I am unable to understand the issue you are facing

Wira Bhakti · Accepted Answer · 2019-03-21 08:21:09Z

0

just make one function...

def binaryToHex():
    binval = input('Input a binary number : ')
    num = int(binval, base=2)
    hexa = hex(num).upper().lstrip('0X')
    print(f'The hex value is {hexa}')

answered Mar 21, 2019 at 8:21

Wira Bhakti

4464 silver badges15 bronze badges

4 Comments

Jon Clements Over a year ago

Have you tried this with an input of 00000000 - .lstrip doesn't do what you think it does here...

PatienceMuthoki Over a year ago

Sure i've tried what @Wira Bhakti has done and doesn't display the correct thing. Furthermore we are required to use 2 functions

Wira Bhakti Over a year ago

@JonClements can you explain why 'X0X'.lsplit('X0') interpreted as a "" (blank string)...?

Jon Clements Over a year ago

@Wira .lstrip removes all characters (not the entire string itself) in the string given from the start of the string until it encounters a character that's not in the characters given.... hence... 'ABCABCABC'.lstrip('BCA') will give you an empty string, but 'ABCABCDABC'.lstrip('BCA') will give you 'DABC'...

Collectives™ on Stack Overflow

Python function to convert Binary digit to Hexadecimal

3 Answers 3

4 Comments

2 Comments

4 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

4 Comments

2 Comments

4 Comments

Your Answer

Sign up or log in

Post as a guest

Related