Creating a script with a class have specific properties

[dvldgs05]

I have a small txt file with fields Block, Plot, Species, and DBH. I need to create a script with a class having those properties. Within the class I need to include a method that calculates "DIB = DBH * (1/1.09)". DBH is the diameter 4.5 feet from the ground. Once I am completely done I need to run a script that imports the class and prints the results in this format:

Output:
Report 1
Block:
Plot:
Species:
DBH:
DIB:
Report 2
etc.

There are a total of 9 objects. So far I am working the class but not sure I got it correct. I got no errors but I also didn't get any returns. Here is where I am. By the way I am the beginner of beginners so please don't laugh. If you do please help once you stop.

class Tree:
    def __init__(self,Block,Plot,Species,DHB):
        self.Block = Block
        self.Plot = Plot
        self.Species = Species
        self.DHB = DHB

    def assessment(self):
        if self.DHB == 4.5:
            rate = (1/1.09)
        assessment = self.DHB * rate
        return assessment