Convert Strings as Bytes to String

Question

I read the first few bytes of a JPEG

f = open(filename, 'rb')
firstTwoBytes = f.read(2)
if firstTwoBytes != '\xff\xd8':

firstTwoBytes iny my debugger is: bytes: b'\xff\xd8' which is correct?

So my String comparison fails. How best to fix this?

Thanks

Harry.Chen · Accepted Answer · 2013-07-08 10:02:57Z

2

Try this:

if firstTwoBytes != b'\xff\xd8':

answered Jul 8, 2013 at 10:02

Harry.Chen

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1 Comment

Chan Thanks. As a matter of interest is this a python 3 thing? Is there any difference in behaviour here between python2 and python3?

ElmoVanKielmo · Accepted Answer · 2013-07-08 10:02:52Z

1

So, compare to binary not to the string:

f = open(filename, 'rb')
firstTwoBytes = f.read(2)
if firstTwoBytes != b'\xff\xd8':

answered Jul 8, 2013 at 10:02

ElmoVanKielmo

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