Use a Quick Fix to generate instance attribute assignment.
Put your cursor on a constructor argument, hit Alt-Enter,
and let the IDE generate the line for assigning to self.
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 Alt-Enter
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.