Code Example of Hashmap in Python

Outrageous Ostrich answered on May 14, 2020 Popularity 10/10 Helpfulness 2/10

answer Code Example of Hashmap in Python

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Code Example of Hashmap in Python

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class HashTable:

	# Create empty bucket list of given size
	def __init__(self, size):
		self.size = size
		self.hash_table = self.create_buckets()

	def create_buckets(self):
		return [[] for _ in range(self.size)]

	# Insert values into hash map
	def set_val(self, key, val):
		
		# Get the index from the key
		# using hash function
		hashed_key = hash(key) % self.size
		
		# Get the bucket corresponding to index
		bucket = self.hash_table[hashed_key]

		found_key = False
		for index, record in enumerate(bucket):
			record_key, record_val = record
			
			# check if the bucket has same key as
			# the key to be inserted
			if record_key == key:
				found_key = True
				break

		# If the bucket has same key as the key to be inserted,
		# Update the key value
		# Otherwise append the new key-value pair to the bucket
		if found_key:
			bucket[index] = (key, val)
		else:
			bucket.append((key, val))

	# Return searched value with specific key
	def get_val(self, key):
		
		# Get the index from the key using
		# hash function
		hashed_key = hash(key) % self.size
		
		# Get the bucket corresponding to index
		bucket = self.hash_table[hashed_key]

		found_key = False
		for index, record in enumerate(bucket):
			record_key, record_val = record
			
			# check if the bucket has same key as
			# the key being searched
			if record_key == key:
				found_key = True
				break

		# If the bucket has same key as the key being searched,
		# Return the value found
		# Otherwise indicate there was no record found
		if found_key:
			return record_val
		else:
			return "No record found"

	# Remove a value with specific key
	def delete_val(self, key):
		
		# Get the index from the key using
		# hash function
		hashed_key = hash(key) % self.size
		
		# Get the bucket corresponding to index
		bucket = self.hash_table[hashed_key]

		found_key = False
		for index, record in enumerate(bucket):
			record_key, record_val = record
			
			# check if the bucket has same key as
			# the key to be deleted
			if record_key == key:
				found_key = True
				break
		if found_key:
			bucket.pop(index)
		return

	# To print the items of hash map
	def __str__(self):
		return "".join(str(item) for item in self.hash_table)


hash_table = HashTable(50)

# insert some values
hash_table.set_val('softhunt.net', 'some value')
print(hash_table)
print()

hash_table.set_val('website@example.com', 'some other value')
print(hash_table)
print()

# search/access a record with key
print(hash_table.get_val('softhunt.net.com'))
print()

# delete or remove a value
hash_table.delete_val('softhunt.net.com')
print(hash_table)

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Source: softhunt.net

Tags: hashmap python

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Contributed on Apr 10 2022

Outrageous Ostrich

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hashmap python

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my_dict={'Dave' : '001' , 'Ava': '002' , 'Joe': '003'}
print(my_dict.keys())
print(my_dict.values())
print(my_dict.get('Dave'))

Popularity 10/10 Helpfulness 3/10 Language python

Source: Grepper

Tags: hashmap

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Contributed on May 14 2020

Anxious Ant

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python hashmap

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d = dict(apple='red', banana='yellow', cherry='red')


print(d)


e = {}

e['apple'] = 'red'
e['banana'] = 'yellow'
e['cherry'] = 'red'

print(e)

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Source: Grepper

Tags: hashmap

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Contributed on Dec 11 2022

szabioe

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hashmap in python

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dict = {'Name': 'Peter', 'Age': 18}
print ("Value : %s" % 
dict.get('Name'))
print ("Value : %s" % 
dict.get('ID',"none"))

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Source: phperrorcode.com

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Contributed on Jul 20 2022

warner smith

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hashmap in python

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Hash tables are a type of data structure in which the address or the index value of the data element is generated from a hash function.
That makes accessing the data faster as the index value behaves as a key for the data value.
In other words Hash table stores key-value pairs but the key is generated through a hashing function.

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Source: warner.hashnode.dev

Tags: hashmap python

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Contributed on Jul 31 2022

warner smith

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Code Example of Hashmap in Python

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