Get Image File Size From Base64 String

Question

I\'m working on a python web service. It calls another web service to change the picture of a profile.

It connects to another web service. This web service can only

Answer 1

I'm using this:

def size(b64string):
    return (len(b64string) * 3) / 4 - b64string.count('=', -2)

We remove the length of the padding, which is either no, one or two characters =, as explained here.

Probably not optimal. I don't how efficient str.count(char) is. On the other hand, it is only performed on a string of length 2.