MicroPython Forum (Archive)

Steps that convert a byte-string to an ascii-string:

>>> print(Message)
b'4f6e'
>>> x=Message.decode('ascii')
>>> print(x)
4f6e
>>> y=ubinascii.unhexlify(x)
>>> print(y)
b'On'
>>> z=y.decode('ascii')
>>> print(z)
On

Is there a simpler, one step process to make the same conversion?
In other words turning this: b'4f6e' into this: On

Found the solution, to my own question

message=b'4f6e'
message=ubinascii.unhexlify(message).decode('ascii')
print(message)
On

I found this works... str(theByteString, 'utf-8') as well. Does the job of converting b'' string decoding. Maybe a good thing to avoid another import unless you really need it?

I tried it in PYTHON Idle & micropython.

msg = b'4f6e'
msg = str(msg, 'utf-8')
print(msg)
4f6e

It did not decode the byte stream to - On

Tried:

msg = b'4f6e'
msg = str(msg, 'utf-8').decode('ascii')
Traceback (most recent call last):
File "<pyshell#4>", line 1, in <module>
msg = str(msg, 'utf-8').decode('ascii')
AttributeError: 'str' object has no attribute 'decode'.

BTW: 'ascii' works as well as 'utf-8'

In python 3 works
See documentation for unhexlify and str.

Jibun no kage wrote: ↑

Mon Jul 25, 2022 10:12 pm

I found this works... str(theByteString, 'utf-8') as well. Does the job of converting b'' string decoding. Maybe a good thing to avoid another import unless you really need it?

The 'Jibun no kage' suggestion was to avoid importing "binascii"; your approach and mine require importing "binascii' for Python, or "ubinascii" for micropython.

You'll always need (u)binascii for this kind of data, as it's a series of hexadecimal digits encoded as ASCII bytes. If it were bytes, the input would be b'On'

I totally agree, binascii (Python), or ubinascii (microPython) is always necessary for these conversions.

I also have a little utilty I wrote called dump_mem.py which you can find here:
https://github.com/dhylands/bioloid3/bl ... ump_mem.py

It prints out output that looks like this: It has options for specifying line length, adding a Prefix to each line, whether the ASCII should be shown along side the hex or not. whether the address should be shown, and what function to use to send the output to.