Python: __eq__(self, other): len(self.sensor_data) ok, but len(other.senor

I have a class named CAN_MSG for which I want to define the __eq__ method so that I can check two classes for equality.

Input_CAN_Sorter.py:

class CAN_MSG:
    def __init__(self, first_sensor_id, timestamp, sensor_data):
        self.first_sensor_id = first_sensor_id
        self.sensor_data = sensor_data
        self.timestamp = timestamp

    def __eq__(self, other):
        result = self.first_sensor_id == other.first_sensor_id
        n = len(self.sensor_data)  # no Error
        i = len(other.senor_data)  # AttributeError: 'CAN_MSG' object has no attribute 'senor_data'.
        result = result and len(self.sensor_data) == len(other.senor_data)

        for i in range(len(self.sensor_data)):
            result = result and self.sensor_data[i] == other.senor_data[i]

        result = result and self.timestamp == other.timestamp
        return result

The class has a list of ints called sensor_data. When I compare using __eq__(self, other): There is no problem with len(self.sensor_data), but with len(other.sensor_data) I get the following error:

AttributeError: 'CAN_MSG' object has no attribute 'senor_data'.

I don't understand why I can access self.sensor_data but not other.sensor_data.

test.py:

from Input_CAN_Sorter import CAN_MSG

list_temp = [1, 2, 3, 4, 5, 6, 7]
list_temp2 = [1, 2, 3, 4, 5, 6, 7]

CAN_MSG_1 = CAN_MSG(1, "TIME", list_temp)
CAN_MSG_2 = CAN_MSG(1, "TIME", list_temp2)


if CAN_MSG_1 == CAN_MSG_2:
    print("=")

In C I would have done a check for the class type before and maybe a cast afterwards so that the compiler knows for sure that it is the same class, but in Python this is not possible/necessary if I understand correctly.

Probably this is a completely stupid mistake but I'm not 100% familiar with Python and can't come up with a reasonable explanation.

CodePudding user response：

You misspelled your variable name.

AttributeError: 'CAN_MSG' object has no attribute 'senor_data'.

i = len(other.senor_data)

You meant to write:

i = len(other.sensor_data)