Some help with my first python class and importing ....im making a lidar program

[deanhystad]

Why are you doing this?

        self.__angle_min = 0.0 

A single leading underscore is the convention for marking an attribute for internal use only (pseudo private). Leading with a doulbe underscore should be saved for the special case where subclasses of a class should not have access to the attribute. self.__angle_min = 0 creates an attribute with a mangled name _LaserProjection__angle_min. In the LaserProjection class, self.__angle_min will return this variable, but it will generate an error in a subclass.

class LaserProjection:
    def __init__(self):
        self.__angle_min = 0

    def __str__(self):
        return f"Angles = {self.__angle_min}"


class LaserProjectionSubclass(LaserProjection):
    def __init__(self):
        self.__angle_max = 0

    def __str__(self):
        return f"Angles = {self.__angle_min}, {self.__angle_max}"


print(LaserProjection())
print(LaserProjectionSubclass())

Error:
Angles = 0
Traceback (most recent call last):
  File "...test.py", line 18, in <module>
    print(LaserProjectionSubclass())
  File "...test.py", line 14, in __str__
    return f"Angles = {self.__angle_min}, {self.__angle_max}"
AttributeError: 'LaserProjectionSubclass' object has no attribute '_LaserProjectionSubclass__angle_min'. Did you mean: '_LaserProjectionSubclass__angle_max'? 

Why do you do this?

import laser_geometry
import laser_geometry.laser_geometry as lg

If you only use laser_geometry.laser_geometry, you do not need to also import laser_geometry.

Some vertical whitespace will make your program much easier to read. Two blank lines before a class or a function is suggested.