Python Tutorial - || Dictionaries || Hash Table || Hashmap || Code Walk-through ||

Welcome everyone! This is a Python tutorial on creating your own python dictionaries using hash table and hashmap. This is a code walk-through were i explain everything that I'm doing, so that you can learn python! Python tutorials, GitHub code, and subreddit link below!

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Learn how dictionaries are created and implemented using Python, We use them all the time... may as well know how they work. 👍
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[SoumilShah]

Great tutorials one thing the key error should be raised outside the for loop not inside as there may be more key value paid you need to iterate



""" Get """
hashKeyIndex = self.HashFunction(key)
slots = self.bucket[hashKeyIndex]

for i in range(0, len(slots)):
if slots[i][0] == key:
return slots[i][1]
else:
pass

raise KeyError("Key you have entered Dont exists ")

[achrafelouazouzi]

Using i outside of the loop is a terrible idea, you should store the value of i in an external variable before you break and use that instead, other than that I would say great tutorial I found it very useful so thank you very much!

[philperry]

If you add
if not slot:
raise KeyError('Key not found')
before the for-Loop in the get-Method, you avoid getting a NoneType back, since
if key == k:
only raises an error if a slot is alread taken and the keys don't match.
Thanks for the video.

[chris.w]

Nice implementation.
But at 7:57 line 27, I don't think you should use a local variable in for-loop outside of the for-loop.
Even though it works, it is dangerous.

[drisaudagthare]

class MyHashMap(object):
def __init__(self):
self.arr = [-1] *

def put(self, key, value):
self.arr[key] = value

def get(self, key):
if self.arr[key] in self.arr:
return self.arr[key]
else:
return -1

def remove(self, key):
self.arr[key] = -1