Python 程式來實現二項樹
當需要用 Python 實現二項樹時,會用到面向物件方法。此處,定義了一個類和屬性。在該類中定義用於執行某些操作的函式。建立該類的例項,並使用該函式執行計算器操作。
以下是對此執行操作的演示演示:
示例
class binomial_tree:
def __init__(self, key):
self.key = key
self.children = []
self.order = 0
def add_at_end(self, t):
self.children.append(t)
self.order = self.order + 1
my_tree = []
print('Menu')
print('create <key>')
print('combine <index1> <index2>')
print('exit')
while True:
option = input('What do you wish like to do? ').split()
operation = option[0].strip().lower()
if operation == 'create':
key = int(option[1])
b_tree = binomial_tree(key)
my_tree.append(b_tree)
print('Binomial tree has been created.')
elif operation == 'combine':
index_1 = int(option[1])
index_2 = int(option[2])
if my_tree[index_1].order == my_tree[index_2].order:
my_tree[index_1].add_at_end(my_tree[index_2])
del my_tree[index_2]
print('Binomial trees have been combined.')
else:
print('Order of trees need to be the same to combine them.')
elif operation == 'exit':
print("Exit")
break
print('{:>8}{:>12}{:>8}'.format('Index', 'Root key', 'Order'))
for index, t in enumerate(my_tree):
print('{:8d}{:12d}{:8d}'.format(index, t.key, t.order))輸出
Menu create <key> combine <index1> <index2> exit What do you wish like to do? create 7 Binomial tree has been created. Index Root key Order 0 7 0 What do you wish like to do? create 11 Binomial tree has been created. Index Root key Order 0 7 0 1 11 0 What do you wish like to do? create 4 Binomial tree has been created. Index Root key Order 0 7 0 1 11 0 2 4 0 What do you wish like to do? combine 0 1 Binomial trees have been combined. Index Root key Order 0 7 1 1 4 0 What do you wish like to do? exit Exit
說明
- 定義名為“binomial_tree”的類。
- 它有一個方法,用於將元素新增到樹的末尾。
- 建立空列表。
- 根據選項,使用者選擇一個選項。
- 如果選擇建立鍵,將建立類的例項,並建立二項樹。
- 還可以計算索引、根值和順序。
- 如果需要合併索引,將選擇另一個選項,並提及需要合併的節點的索引值。
- 這會合並資料並顯示資料。
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