Creating a script with a class have specific properties

[buran]

May I ask why the 'tree' in 'print(tree.report(1))' isn't capitalized? I am confused about this point. Because in previous sentences nothing is defined as 'tree', but only the class 'Tree'

I think this is about my example. Tree is the class. tree is just a variable name, i.e. it could be whatever you want. So tree is an instance of class Tree. It's created on line #18. You are not correct there is nothing defined as tree. From my example:

#example how to instanciate object of class Tree
#ignore numbers if they don't make business sense
   
tree = Tree(block=1, plot=5, species=7, dhb=200)
print(tree.report(1))

Once again - tree is just variable, instance of Tree. You may have many instances of a class in your code.