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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.data[nextslot]=data | |
else: | |
self.data[nextslot] = data #replace | |
def hashfunction(self,key,size): | |
return key%size | |
def rehash(self,oldhash,size): | |
return (oldhash+1)%size | |
def get(self,key): | |
startslot = self.hashfunction(key,len(self.slots)) | |
data = None | |
stop = False | |
found = False | |
position = startslot | |
while self.slots[position] != None and \ | |
not found and not stop: | |
if self.slots[position] == key: | |
found = True | |
data = self.data[position] | |
else: | |
position=self.rehash(position,len(self.slots)) | |
if position == startslot: | |
stop = True | |
return data | |
def __getitem__(self,key): | |
return self.get(key) | |
def __setitem__(self,key,data): | |
self.put(key,data) | |
H=HashTable() | |
H[54]="cat" | |
H[26]="dog" | |
H[93]="lion" | |
H[17]="tiger" | |
H[77]="bird" | |
H[31]="cow" | |
H[44]="goat" | |
H[55]="pig" | |
H[20]="chicken" | |
print(H.slots) | |
print(H.data) | |
print(H[20]) | |
print(H[17]) | |
H[20]='duck' | |
print(H[20]) | |
print(H[99]) | |
print(H.slots) | |
print(H.data) |
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