map.py

class HashTable:
    def __init__(self):
        self.size = 11
        self.slots = [None] * self.size
        self.data = [None] * self.size

    def put(self,key,data):
        hashvalue = self.hashfunction(key,len(self.slots))

        if self.slots[hashvalue] == None:
            self.slots[hashvalue] = key
            self.data[hashvalue] = data
        else:
            if self.slots[hashvalue] == key:
                self.data[hashvalue] = data #replace
            else:
                nextslot = self.rehash(hashvalue,len(self.slots))
                while self.slots[nextslot] != None and self.slots[nextslot] != key:
                    nextslot = self.rehash(nextslot,len(self.slots))

                if self.slots[nextslot] == None:
                    self.slots[nextslot] = key
                    self.slots[nextslot] = data
                else:
                    self.data[nextslot] = data  #replace
    
    def get(self,key):
        startslot = self.hashfunction(key,len(self.slots))

        data = None
        found = False
        stop = False
        pos = startslot
        while self.slots[pos] != None and not found and not stop:
            if self.slots[pos] == key:
                data = self.data[pos]
                found = True
            else:
                pos = self.rehash(startslot,len(self.slots))
                if pos == startslot:
                    stop = True
        return data

    def __getitem__(self,key):
        return self.get(key)

    def __setitem__(self,key,data):
        self.put(key,data)



    def hashfunction(self,key,size):
        return key%size

    def rehash(self,oldhash,size):
        return (oldhash+1)%size

H = HashTable()
H[54] = "CAT"
H[12]