How to read from serial port?

[Grant Edwards]

On 2016-04-26, David Aldrich <David.Aldrich at EMEA.NEC.COM> wrote:

> #!/usr/bin/python3
> import serial
>
> ser=serial.Serial('COM1',115200)
> while True:
>     out = ser.read()
>     print('Receiving...'+out)
>
> When I run it and send data for it to read I get:

> Traceback (most recent call last):
>   File "serial_read.py", line 9, in <module>
>     print('Receiving...'+out)
> TypeError: Can't convert 'bytes' object to str implicitly

Try this:

  print('Receiving...',out)

If you want to convert the bytes you read from the serial port into a
string, you need to decode they bytes (and you have to specify what
encoding to use):

  print('Receiving...' + out.decode('ascii'))

If you google 'Python 3 bytes strings' you should find a bunch of info:

https://docs.python.org/3.5/library/stdtypes.html
http://www.diveintopython3.net/strings.html
http://pythoncentral.io/encoding-and-decoding-strings-in-python-3-x/
https://www.safaribooksonline.com/library/view/fluent-python/9781491946237/ch04.html

-- 
Grant Edwards               grant.b.edwards        Yow! I haven't been married
                                  at               in over six years, but we
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