A fatal error with Arduino and Python

Using Arduino Interfacing w/ Software on the Computer
5

Basically saying keep checking ser until you find a '0', do not progress with the script until Arduino has finished it's function.

I understood your intent, and was pointing out that this code does not do quite that because it has a bug. It only checks every other character, and throws away the other half without looking at them:

while ser.read() == '0':   // if the next serial input char is not '0'

ser.read()                  // read and discard the following char

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-br


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