Python Indentation Error when there is no indent error

Question

Is it me or the interpreter? I see no indentation error in my code but it kept telling me that there is an error! I use auto indentation so it should be ok. When ever there is an indentation error, I backspace then indent again and it seems to fix it because the indentation error is not on that line anymore but on the other line. Can someone please tell me what is wrong

class LogicGate:
    def __init__(self,n):
        self.label = n
        self.output = None

    def getLabel(self):
        return self.label

    def getOutput(self):
        self.output = self.performGateLogic()
        return self.output

Self answer: the auto indentation of my IDE is indent with tab, and sometimes when I back space I indent it with spaces again. So the problem is mixing spaces and tabs. I recommend setting your IDE to indent with spaces or don't use tabs. See https://www.python.org/dev/peps/

Answer 1

It would be,

class LogicGate:
    def __init__(self,n):
        self.label = n
        self.output = None

    def getLabel(self):
        return self.label

    def getOutput(self):
        self.output = self.performGateLogic()
        return self.output