python3 cookbook 學習筆記-資料結構和演算法(未完待續)
阿新 • • 發佈:2019-02-18
資料結構和演算法
- 將序列分解成單獨的變數
can_iter_list = [1,2,3,4,5]
can_iter_str = "hansz"
can_iter = can_iter_str
a,b,c,d,e = can_iter
a,_,b,_,c = can_iter
# 只要是可迭代的物件都可以分解,包括生成器和迭代器等
- 從任意長度的可迭代物件中分解元素
can_iter_list = [1,2,3,4,5]
can_iter_str = "hansz"
can_iter = can_iter_str
a,*b = can_iter
record = ("acme" ,50,11,22,(12,11,2012))
name,*_,(*_,year) = record
- 儲存最後N個元素
from collections import deque
my_deque = deque(maxlen=5)
my_deque.append(1)
# my_deque 最多隻能儲存5個元素
- 找到最大或最小的N各元素
import heapq
a = [1,4,5,542,342,423,1,653,4]
heapq.nlargest(3,a)
heapq.nsmallest(4,a)