splitting string / bytes in Python 3

Question

I downloaded some code from Github for interfacing with a lab equipment:

readBuffer=ctypes.create_string_buffer(1024)
# some C functions modifying readBuffer using ctypes
deviceInfoList=readBuffer.value.split(',')

The last line shows an error: TypeError: a bytes-like object is required, not 'str'

print(type(readBuffer.value)) shows <class 'bytes'>, and print(readBuffer.value) shows b'0,NEWPORT 1936-R v1.2.2 04/06/12 SN22955\r;'.

According to the SDK documentation file, readBuffer is 'a character buffer with the following format: <DeviceID1>,<DeviceDescription1>;<DeviceID2>,<DeviceDescription2>;<DeviceIDX>,<DeviceDescriptionX>. The last line of the code wants to extract the device ID (which is 0).

Split should be a string method if I'm not mistaken, readBuffer.value looks like a byte, while the error complains that it is string not byte. What has gone wrong here?

kabanus · Accepted Answer · 2018-02-01 09:35:50Z

2

Both string and bytes have a split method, that requires an argument of the same type. ',' is not a bytes object - hence the complaint. You want

deviceInfoList=readBuffer.value.split(b',')

answered Feb 1, 2018 at 9:35

kabanus

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