[Swlug] Other peoples code!

[Rhys Sage]

It's one of my biggest frustrations. People have code online that they claim works then when I download it and run it, it does not. Then I have to fault find. Scratching my head a bit on this one because I'm a bit out of my depth.

The main program has the following call..
import pcf8574
from machine import I2C, Pin
import time
 
i2c = I2C(0)
pcf = pcf8574.PCF8574(i2c, 0x20)     <---- this causes an error about a missing attribute PCF8574
 
while True:
    pcf.port = 0xff
    time.sleep(0.5)

The library starts off...


class PCF8574:
    def __init__(self, i2c, address=0x20):
        self._i2c = i2c
        self._address = address
        self._port = bytearray(1)
        if i2c.scan().count(address) == 0:
            raise OSError('PCF8574 not found at I2C address {:#x}'.format(address))

I know the error is probably bloody simple. I do know that my PCF8574 is indeed at 0x20 because I ran a scan. The problem is my lack of knowledge of python and hence my ability to fix whatever was not right in the files I copied and pasted.

Anybody got any suggestions?

The next online meeting I should be able to catch maybe the last few minutes again. Wednesday is the day I do the driving - unless they throw me on another bus on an unknown route with just a route description on paper again. They did that to me last week.

Oh and I didn't win the election. They elected two people well known for their corruption which was frustrating.

Rhys Sage