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https://github.com/coding-horror/basic-computer-games.git
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96 lines
2.9 KiB
Python
96 lines
2.9 KiB
Python
class Node:
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"""
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Nodes of the binary tree of questions.
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"""
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def __init__(self, text, yes_node, no_node):
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# the nodes that are leafs have as text the animal's name, otherwise
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# a yes/no question
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self.text = text
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self.yes_node = yes_node
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self.no_node = no_node
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def update_node(self, new_question, answer_new_ques, new_animal):
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# update the leaf with a question
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old_animal = self.text
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# we replace the animal with a new question
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self.text = new_question
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if answer_new_ques == 'y':
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self.yes_node = Node(new_animal, None, None)
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self.no_node = Node(old_animal, None, None)
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else:
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self.yes_node = Node(old_animal, None, None)
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self.no_node = Node(new_animal, None, None)
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# the leafs have as children None
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def is_leaf(self):
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return self.yes_node == None and self.no_node == None
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def parse_input(message):
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# only accepts yes or no inputs
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correct_input = False
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while not correct_input:
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try:
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inp = input(message)
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token = inp[0].lower()
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if token == 'y' or token == 'n':
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correct_input = True
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except IndexError:
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pass
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return token
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def avoid_void_input(message):
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answer = ''
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while answer == '':
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answer = input(message)
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return answer
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# Initial tree
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yes_child = Node('Fish', None, None)
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no_child = Node('Bird', None, None)
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root = Node('Does it swim?', yes_child, no_child)
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# Main loop of game
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keep_playing = parse_input('Are you thinking of an animal?') == 'y'
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while keep_playing:
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keep_asking = True
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# Start traversing the tree by the root
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actual_node = root
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while keep_asking:
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if not actual_node.is_leaf():
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# we have to keep asking i.e. traversing nodes
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answer = parse_input(actual_node.text)
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if answer == 'y':
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actual_node = actual_node.yes_node
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else:
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actual_node = actual_node.no_node
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else:
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# we have reached a possible answer
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answer = parse_input('Is it a {}?'.format(actual_node.text))
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if answer == 'n':
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# add the new animal to the tree
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new_animal = avoid_void_input(
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'The animal you were thinking of was a ?')
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new_question = avoid_void_input(
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'Please type in a question that would distinguish a {} from a {}:'.format(new_animal, actual_node.text))
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answer_new_question = parse_input(
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'for a {} the answer would be:'.format(new_animal))
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actual_node.update_node(
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new_question+'?', answer_new_question, new_animal)
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else:
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print("Why not try another animal?")
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keep_asking = False
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keep_playing = parse_input('Are you thinking of an animal?') == 'y'
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