Python.format (* str) returns 5348 instead of 50
I have this code for formatting received data from serial port into 2 variables it receives 'v=220f=50'
and formats it to
reads = ser.readline() # data received is 'v=220f=50'
voltage = int('{2}{3}{4}'.format(*reads))
freq = '{7}{8}'.format(*reads)
so voltage = 220
and freq = 50
, but instead I get voltage = 505048
and freq = 5348
!, I tried translating them to int()
but nothing changed. maybe it's some kind of encoding.
ps: I want to save them to a file, so no need to cast them to integers:
fw.write('Voltage is: {0};\t Frequency is: {1}\n'.format(voltage, freq))
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You have a bytes object from ser.readline()
. First you have to convert to string with .decode
:
>>> reads = b'v=220f=50'
>>> voltage = int('{2}{3}{4}'.format(*reads))
>>> voltage
505048
>>> voltage = int('{2}{3}{4}'.format(*reads.decode()))
>>> voltage
220
I also suggest that you parse the values using regex. The current approach breaks easily when the length of any of the values changes.
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