The Struct unpacking i only working in python 2 and i need to understand how to do it in Python 3

Question

I'm trying to run this code in python 3 it only works in python 2

struct.unpack('f', "".join(map(chr, bytes)))[0]

def get_float(data, index):
    bytes = data[4*index:(index+1)*4]
    return struct.unpack('f', "".join(map(chr, bytes)))[0]

I get this error

Type Error: a byte like object is required, not 'str"

I get an error saying Type Error: a byte like object is required, not 'str" I'll add the code — Kavon Campbell
– Kavon Campbell, Commented Apr 16, 2018 at 22:08

TwistedSim · Accepted Answer · 2018-04-16 22:22:45Z

1

You can try the following:

struct.unpack('f', b"".join(map(chr, bytes)))[0]

a b"" is a byte-string. Since the unpack need bytes, you need to use the byte-string join method.

EDIT: you don't need to map your bytes to char. You can use:

struct.unpack('f', bytes)[0]

Note that bytes shadow the class bytes.

edited Apr 16, 2018 at 22:22

answered Apr 16, 2018 at 22:11

TwistedSim

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1 Comment

OneCricketeer Over a year ago

You may want to explain why the b is needed

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