Python: Binary to Base64

Question

So I have a binary number, 001000 i.e. 8.

If I do base64.b64encode(001000) I get an error.

So I do base64.b64encode(b'001000') and I get b'MDAxMDAw'.

But I need to get the base64 character in the index of the original number, 001000 or 8, which in this case would be 'I'. Or if the number was 011100 (28), then the corresponding character on the base64 table with a value of 28 would be: 'd'.

For example: here are some values in the b64 table

0 == A, 1 == B, 2 == C, 3 == D, 4 == E

So what I want to do is: First, convert the binary number to decimal (000011 == 3) . Then take that number and compare it to the base64 table, and you will see that 3 or 000011, is equal to 'D'.

Does anyone know how I could do this?

if you do base64.b64encode(b'0b001000') you get b'MGIwMDEwMDA=' — Merp
– Merp, Commented Jan 5, 2021 at 21:32

Jaap Joris Vens · Accepted Answer · 2021-01-05 21:32:48Z

2

If I understand correctly, the following should do what you want:

base64.b64encode(bytes([0b001000]))

Explanation:

0b001000: the 0b notation returns the integer 8
[0b001000]: creates an array of length 1
bytes([0b001000]): converts an iterable to bytes
b64encode(bytes([0b001000])): converts these bytes to base64 encoding

answered Jan 5, 2021 at 21:32

Jaap Joris Vens

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7 Comments

Merp Over a year ago

that returned b'CA==' for me, but what i was hoping for was 'I'

Merp Over a year ago

if you look at a base64 table you will see the value column and character column and since the value of 'I' is 8 when i do 001000 i expected an 'I', thanks anyway

Jaap Joris Vens Over a year ago

CA== is the base64 encoding of the byte 0001000, right? Where does the 'I' come from?

Merp Over a year ago

well, 001000 in decimal is 8 and in the base64 table 'I' in base64 is equal to 8 in decimal right?

Merp Over a year ago

sorry if that is confusing

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