It's one of those chores...your class has an __init__ with some arguments and you need to assign them to self. What a lot of typing.

Let the IDE do it for you. As you type the argument name, hit ⌥⏎ (macOS) / Alt+Enter (Windows/Linux) and choose Add 'field' to constructor, then type the next argument. Or later, put the cursor on each argument and invoke it. PyCharm will create the assignment for you.