Bytearray disk size

Question

Suppose I convert some image to bytearray.

with open("img.png", "rb") as imageFile:
  f = imageFile.read()
  b = bytearray(f)

print b[0]

How do I know how much disk space this bytearray will take over if I decide to save you.

Answer 1

You can use the native function len() to calculate the size in bytes of a bytearray, look at you:

with open("img.png", "rb") as imageFile:
    f = imageFile.read()
    b = bytearray(f)

print(len(b))

Exit:

384373

Comparing:

$ ls -al img.png 
-rw-rw-r-- 1 lacobus lacobus 384373 Jul  3 17:24 img.png