Lecture "Organising information: trees", exercise 2

[essepuntato]

Write the pure iterative version of the function defined in the previous exercise in Python.

[ranacoskun]

def test_breadth_first_visit(root_node, expected):
    if expected == breadth_first_visit(root_node):
        return True
    else:
        return False
        
def breadth_first_visit(root_node):
    output_list = []
    queue = []
    queue.append(root_node)
    
    while queue != []:
        output_list.append(queue[0])
        queue.extend(queue[0].children)
        queue.pop(0)
    return output_list

elizabeth = Node("elizabeth")
charles = Node("charles", elizabeth)
anne = Node("anne", elizabeth)
william = Node("william", charles)
harry = Node("harry", charles)
george = Node("george", william)
charlotte = Node("charlotte", william)
louis = Node("louis", william)
archie = Node("archie", harry)

royals = [elizabeth,charles,anne,william,harry,george,charlotte,louis,archie]
print(test_breadth_first_visit(elizabeth, royals))

[n1kg0r]

from anytree import Node
from collections import deque


def test_breadth_first_visit(root_node, expected):
    return expected == breadth_first_visit(root_node)


def breadth_first_visit(root_node):
    result = list()
    
    if root_node is None:
        return 
    q = deque()
    q.append(root_node)

    while(len(q)):
        node = q.popleft()
        result.append(node)

        for child_node in node.children:
            q.append(child_node)

    return result


# Tests
book = Node("book")
chapter_1 = Node("chapter1", book)
chapter_2 = Node("chapter2", book)
paragraph_1 = Node("paragraph1", chapter_1)
text_1 = Node("text1", paragraph_1)
quotation_1 = Node("quotation1", paragraph_1)
text_2 = Node("text2", quotation_1)
text_3 = Node("text3", paragraph_1)
quotation_2 = Node("quotation2", paragraph_1)
text_4 = Node("text4", quotation_2)
paragraph_2 = Node("paragraph2", chapter_1)
text_5 = Node("text5", paragraph_2)
paragraph_3 = Node("paragraph3", chapter_1)
text_6 = Node("text6", paragraph_3)
text_7 = Node("text7", chapter_2)
text_8 = Node("text8", book)
bfv = [book,
       chapter_1, chapter_2, text_8,
       paragraph_1, paragraph_2, paragraph_3, text_7,
       text_1, quotation_1, text_3, quotation_2, text_5, text_6,
       text_2, text_4]

bfv_from_chapter_1 = [chapter_1, paragraph_1, paragraph_2, paragraph_3, text_1, quotation_1, text_3, quotation_2, text_5, text_6, text_2, text_4]


print(test_breadth_first_visit(book, bfv))
print(test_breadth_first_visit(chapter_1, bfv_from_chapter_1))