The hash table in python is used to store the data through key-value pairs; it is implemented by using the dictionary. A Hash table is one of the data structures that store the data in the form of key-value pair. Every value has a unique key that is generated through a hash function, which makes accessing the data or value in the hash table faster, regardless of the number of values present in the hash table.

Dictionary is the built-in data type in python, with the help of which implements the hash table in python. A hashing function is used in Python to generate the keys of a dictionary. A dictionary’s keys are not ordered and can be modified.

The syntax to create the dictionary in the python –

The dictionary can be created in python by using the braces “{“ and “}” and also can be created by using the dict() function. When creating a dictionary by using the curly braces, the key and value are separated by the “:” and each pair separated by the “,”. Whereas direct() is the built-in function to create the dictionary using dict() function, the key and value are separated by the “=”, and each key-value pairs are separated by the “,”.

The hash table in python can be created with the help of the dictionary, and the dictionary can be created by using the curly braces and dict() function. Suppose we have a dictionary of the student marks which contains the student marks. Now we need to update the student marks data, so we can perform as “Student_marks[56] = 65”, where Student_marks is the dictionary, and 56 is the key stored in the dictionary for the student of roll no 56. So it updates the marks value 65 for roll no 56.

Given below are the examples of the hash table in python:

Example for a hash table in python to create and access the dictionary values –

d = { 'Name' : 'John', 'Rollno' : 34, 'Marks' : 89}

# Access the value of the dictionary with the key

# passing the non-available key in the dictionary

Example for a hash table in python to delete the dictionary key-value pair –

Fruits_count = { 'apple' : 50, 'banana' : 34, 'orange' : 89, 'cherry' : 78}

print( "Fruits_count['apple'] : ", Fruits_count['apple'])

print( "Fruits_count['cherry'] : ", Fruits_count['herry'])

print( "Fruits_count['orange'] : ", Fruits_count['orange'])

# delete the key value pair in dictionary with key

del Fruits_count['apple'] # printing the dictionary

# deleting the non-available key in the dictionary

Example for a hash table in python to update the dictionary values –

Student_marks = { 12 : 59, 56 : 60, 18 : 89, 27 :78, 30 : 68}

print( "Student_marks[56] : ", Student_marks[56] )

print( "Student_marks[12] : ", Student_marks[12] )

print( "Student_marks[27] : ", Student_marks[27] )

# update the value in dictionary with key

In this blog, we will discuss the Hash table in Python.

Hash table in Python

C has an information structure called hash table which maps the keys to the qualities, this information structure is additionally present in C++. Hash functions are utilized by this information structure for computing the indexes of a key. The values can be put away at specific locations utilizing the hash table index. On the off chance that in case two different keys have a similar index and different information structures, significant buckets are utilized for being an account of the collisions. This article focuses on the hash table in C. It would consist of the approaches to creating a hash table with guides to show and the principles and guidelines which ought to be observed while creating it.

Firstly, we will have to create an array of data, structure which would be a hash table.

Now, a key has to be taken which would be stored in the hash table as input.

After this, an index would be generated which would correspond to the key.

If in case, any data is absent in the array’s index then we will have to create the data and insert it then we will have to increase the size of a hash table.

If in case, the data is already existing then new data is not inserted if the originally present data is not the same as the given key.

For displaying every element of the hash table, we need to extract data of each index and the elements are read and eventually printed.

For removing a key from the hash table, we need to calculate the index and the data is to be extracted then delete the specific key once the key matches.

In C, a hash function is used by the hash table for calculating the indicator or famously called hash law in an array of places or pails, and from these places or pails, the needed value can be brought. While doing the lookup, the key gets minced and the attendant hash represents the position of the needed value stored. Generally, a specific key is assigned by the hash function to a unique niche but substantially the hash table designed has an amiss hash function which can beget collisions in situations where the generated hash function is the indicator for multiple keys.

struct Course *content = (struct Course*) malloc(sizeof(struct Course));

while(Array[Product] != NULL && Array[Product]->two != +2) {

struct Course* delete(struct Course* content) {

n<EUCBACOURSE; n++) { if(Array[n] != NULL) printf(" (%d,%d)",Array[n]->two,Array[n]->one);

Content = (struct Course*) malloc(sizeof(struct Course));

In this artical we will know about Hash table in C. How to create it, how to work with it,its example and its rules. 

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