In [19]:

    

class Tree:
    '''Class for a tree'''
    
    def __init__(self, tree_id, species):
        '''
        Constructor of a tree.
        @param tree_id ID of a tree
        @param species Species of the tree
        '''
        self.id = tree_id
        self.species = species
    
    def getSpecies(self):
        return(self.species)
        
class Forest:
    '''Class for a forest'''
    
    def __init__(self, tree):
        '''
        Constructor of a forest.
        @param tree a tree class object
        '''
        self.trees = []
        self.trees.append(tree)
        
    def addTree(self, tree):
        self.trees.append(tree)
        
    def getTrees(self):
        return(self.trees)


    

In [22]:

    

t = Tree(1, "Eiche")
f = Forest(t)
t = f.getTrees()
t[0].getSpecies()
f.addTree(Tree(2, "Buche"))
t = f.getTrees()
print(len(t))
print(t[0].getSpecies())
print(t[1].getSpecies())


    

    




2
Eiche
Buche