笔记带有个人侧重点,不追求面面俱到。
15 数据结构
出处: 菜鸟教程 - Python3 数据结构
15.1 将列表当作队列使用
在列表的最后添加或者弹出元素速度快,然而在列表里插入或者从头部弹出速度却不快(因为所有其他的元素都得一个一个地移动)。
15.2 遍历技巧
遍历字典:
>>> knights = {'gallahad': 'the pure', 'robin': 'the brave'}
>>> for k, v in knights.items():
... print(k, v)
...
gallahad the pure
robin the brave
遍历列表:
>>> for i, v in enumerate(['tic', 'tac', 'toe']):
... print(i, v)
...
0 tic
1 tac
2 toe
遍历多个序列:文章来源:https://www.toymoban.com/news/detail-691219.html
>>> questions = ['name', 'quest', 'favorite color']
>>> answers = ['lancelot', 'the holy grail', 'blue']
>>> for q, a in zip(questions, answers):
... print('What is your {0}? It is {1}.'.format(q, a))
...
What is your name? It is lancelot.
What is your quest? It is the holy grail.
What is your favorite color? It is blue.
反向遍历:文章来源地址https://www.toymoban.com/news/detail-691219.html
>>> for i in reversed(range(1, 10, 2)):
... print(i)
...
9
7
5
3
1
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