Convert 2 byte from byte array to one integer

Question

I have a list of bytearrays that looks like that :

data = [
   bytearray(b'\x01'),
   bytearray(b'\x03'),
   bytearray(b'\x04'),
   bytearray(b'\x01'),
   bytearray(b'\x05'),
   bytearray(b'\x00'),
   bytearray(b'\xC0'),
   bytearray(b'\xfa'),
   bytearray(b'3')
]

This array is what I read from a sensor. What I need is to uses data[3] and data[4] together (so 01 05 ) to convert this into an integer (should be 261) to get a value from the sensor. I struggle to do it. Can anyone help please?

juanpa.arrivillaga · Accepted Answer · 2020-12-02 05:51:10Z

5

int provides an alternative constructor for this:

>>> int.from_bytes(data[3] + data[4], 'big')
261

answered Dec 2, 2020 at 5:51

juanpa.arrivillaga

97.6k14 gold badges141 silver badges190 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Selcuk · Accepted Answer · 2020-12-02 05:43:47Z

3

You can use

data[3][0] * 256 + data[4][0]

or

data[3][0] << 8 | data[4][0]

answered Dec 2, 2020 at 5:43

Selcuk

60.1k12 gold badges114 silver badges119 bronze badges

Comments

hhz · Accepted Answer · 2020-12-02 05:51:41Z

2

A readable solution would be:

temp = data[3] + data[4]
r = int.from_bytes(temp, byteorder='big', signed=False)

Combining the bytearrays and using the from_bytes method to create an integer (which is indeed 261 with byteorder 'big' and unsigned).

answered Dec 2, 2020 at 5:51

hhz

1167 bronze badges

Collectives™ on Stack Overflow

Convert 2 byte from byte array to one integer

3 Answers 3

Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related