backup a easy implement
# coding: utf-8 def add(k, v): pass def get(target): pass class LinearMap(object): """线性表结构""" def __init__(self): self.items = [] def add(self, k, v): self.items.append((k, v)) def get(self, k): for key, val in self.items: if key == k: return val raise KeyError class BetterMap(object): """利用 LinearMap 对象作为子表,建立更快的查询表""" def __init__(self, n=100): self.maps = [] # 总表格 for i in range(n): self.maps.append(LinearMap()) def find_map(self, k): index = hash(k) % len(self.maps) return self.maps[index] def add(self, k, v): m = self.find_map(k) m.add(k, v) def get(self, k): m = self.find_map(k) return m.get(k) class HashMap(object): def __init__(self): self.maps = BetterMap(2) self.num = 0 def get(self, k): return self.maps.get(k) def add(self,k, v): if self.num == len(self.maps.maps): self.resize() self.maps.add(k, v) self.num += 1 def resize(self): new_maps = BetterMap(self.num * 2) for m in self.maps.maps: for k, v in m.items: new_maps.add(k, v) self.maps = new_maps
Reference:
https://www.cnblogs.com/hanahimi/p/4765265.html hash 表学习笔记
http://python.jobbole.com/86522/?utm_source=blog.jobbole.com&utm_medium=relatedPosts Python源码分析-PyDictObject
https://www.nosuchfield.com/2016/07/29/the-python-implementationp-of-HashTable/ HashTable 的 Python 实现
https://harveyqing.gitbooks.io/python-read-and-write/content/python_advance/python_dict_implementation.html Python字典实现