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Topics for Python - Basics ( Syntax , Construct , Variables , Operators , Data Structures , Decision Making statements , Loops , Functions , Object Oriented programming )

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Topics for Python - Basics

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1)     Syntax

 *   Python is very popular because of its simplicity to use and understand

 *   Simplicity of Python programming language lies in its syntax

 *   Python does not follow any complicated formats for writing of codes

 *  Syntax of Python quite different from other languages like C, C++, Java etc and      much easier to comprehend

 

2)     Variables

 *  If one is familiar over the manner in which variables can be declared over any Python program then the topic of manner and efficient declaration of variables can also be done efficiently

 

3)     Operators

 *   Operators are the symbols that represent a particular action or process .

*  One can explore different mathematical operators and calculations that can happen using the available operators in Python

 

4)     Data Structures

 *   Data Structures are the most important concept of any programming language

 *  Data Structures are the building blocks of any programming language as all             programming languages deal with objects creation which deal with memory      allocation , memory deallocation and memory utilisation of the variables / objects using the relevant data structures for carrying out the necessary operations that are needed to be performed as per the program that one is working upon

 *  Python has especially these four data structures that are lists , sets , dictionaries and tuples .

 *   One can get to have a good understanding of the manner in which each of the above listed data structures are put to use in advanced examples which would discuss the manner in which append , deletion or structural operations take over a given data structure .

 *  The most important concepts of Python that need to be used and understood are the following :

 

1)     Decision Making Statements :

 

If , If-else , Nested If else , chained conditionals of the else if type of statements , single statement conditions all come under the category of decision-making statements . Along with earning , one may also have to practice 10+ coding problems on a daily basis which would help someone get familiar with the  manner in which one can scale up on the level of complexity of the programs and their creation

 

2)     Loops :

 

Loops are the structures that repeat a sequence of instructions . Python deals with while loops , for loops and nested loops . Along with these one may also learn loop control statements which show the manner in which loops can be initialised , implemented , interjected and put to end in the desired way of the programmer .

 

3)     Functions in Python

 Functions are the smaller pieces of code that perform some desired task . Python has four different types of functions that are User Defined functions , Built-In functions , Lambda functions and Recursion functions mainly .

 

We will just put a small recap over Functions in Python :

 

User Defined functions are those functions which a user  / programmer writes himself which takes programming constructs and statements to write a function which would achieve a desired result at the end of the function which may include the use of some built-in functions into the overall function code construct . 

Built-In functions are those functions which are created as a part of the programme package at the time of creation of the Program package and its default libraries which come together with the program at the beginning of the program package .

Lambda functions are also some form of user defined function , however the construct is limited to only one line and this usually does the work of iteration over the elements of the function , access the individual elements , or use the functions to iteratively append , retrieve or delete some elements over an existing structure or a dummy/temporary structure .

  

*  Along with the the basic concepts of the scripting part of the Python Language one also needs to have a good understanding of implementation as well as creation of features in Object Oriented Language features of Python :

 

1)     Polymorphism

2)     Inheritance

3)     Encapsulation

4)     Abstraction

 

All these aspects of Programming in Python and how the same are going to  be used in Python for Data Science and Machine Learning Modelling would be

discussed in further blogs . As I am getting disarrayed due to a some intermittent problems over my laptop I am not able to implement some of the important Algorithms and Modellling Processes . But soon , I hope to get these started on a better level .

 

Last modified: 21:32

Lists and Dictionaries in Python Dictionaries in Python

 When should one use dictionaries and when should one use lists in Python

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 *  Lists are the most widely used data when the data is stored in the form of integral indexes with some starting position to some given position within the Python list

 *  Lists are also mostly used when the data that needs to be maintained in a certain specific manner or  where the data needs to be sorted where finding  some data is only good enough when the user of the given set of code is knowing the exact index or position of the item element where the list item needs to be searched or retrieved

 *  Lists are also used when the ordering of items within the List item object is irrelevant as any given element within a list can be searched and retrieved just by using some conditional loops which will iterate over the list item object and then the item could be put to use directly without any form of replacement or elimination within the data structure

 *  One of the main highlighting important points about Lists as a data structure for item storage is that Lists can be used for storage of other lists and tuples as a data storage within it because of which the main list containing the sub-lists within it could act as a parent list object which can keep within it other child objects for storage and retrieval as well

 *   Now coming to dictionaries and what they are used for :-

 *  Dictionaries are perfect storage objects when the data is to be stored on the basis of positonal indexes coupled with an adjoining value associated for that index position . Here also the ordering of the data is not of great matter and does not need to sort the stored data . Finding any associated data of the dictionary object needs only a key value of that object 

*   Example where a List is used for data storage is an example of a shopping cart where any stored item object's storage does not matter .

*  Example where a Dictionary Item object is used as a storage object is that of a an examination roll / rank number sheet ( parikhya patra ) where people are arranged on the basis of their marks obtained in some examination from Rank 1 to the last rank in the exam . Usually the person who obtains the highest marks in a given exam is attributted the 1st rank and the first roll number for that examination is also alloted to the first rank holder after the results are out , the successive role numbers are also attributed according the net marks obtained  by an examiner in the considered case of the examination till the last rank/roll number of the examiner .

 

*  A dictionary is very useful data storage object where one may need to access a given data based on the item that is present over a given index position within the storage object of the data structure .

 *  As a measure of how important the dictionaries are - every module , class , function and method written in Python in the form of dictionaries where all the attribute names are in the form of Keys and all the attribute values there in can be found quickly .

 *  Therefore when one wants to decide upon which data structure to be used for a certain type of data object one might need to consider the best use cases of both these data structure objects : Lists and Dictionary Items .

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To sum up once again for Lists and Dictionaries

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*  Lists are ordered data structure objects that means that the program has control over the order in which the data is stored . This data is also sortable that means that the program can sort the data into whatever order when the data is needed to be fetched and retrieved , the list is also containing a list of iterable items i,e items that can be accessed one item at a time when the list object is iterated or executed within a loop .

 

*  Dictionaries are like the partially ordered data structures that can control the order or the manner in which the data items are inserted and stored within the object in the form of keys and attributes . Dictionaries are non-sortable and iterable in pairs of both keys and associated value objects .

 

 

 

 

 

 

 

 

 

Last modified: 18:49

Technical Data Analyst posted at HP @Bangalore on 07-06-21 - Self Analysis , Upscaling and Recommendation

Technical Data Analyst posted at HP @Bangalore on 07-06-21

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 *   This job position is posted for Bangalore

 *  The relevant years of experience needed for this job is around 0 to 2 years of experience

 

*  The secondary requirement for the fitting criteria is that the person should have a  Master's degree in computer science or Information systems

 

*   A candidate for the job should be able to leverage and scale open source tools .This aspect is currently I am also not sure and I am also not yet sure which  open source tools are being referred to in this , since collaboration tools are the most requisite open source tools that are common to all the people albeit their technological skills

 *   Proficient is SQL and architecting relational databases - NoSql is a plus{ SQL querying skills is a standard requirement across most of the job positions but the niche plays when it comes to the manner in which one is able to perform some of the SQL operations which comes with experience and exposure . Even I can say that , though I am good .. means good in SQL and would rate myself a mid-level person in expertise over SQL , I am not sure I would be able to handle more difficult or expert level queries without starting over from such minimum requirements .Also my work over NoSQL till now has been limited and has not been much diverse because of which NoSql and Big Data system level requirements is still a new thing for me }

 

*  Proficiency in Public Cloud Providers like Amazon AWS , Google GCP , Microsoft Azure etc is also a must { I have some experience over AWS cloud and am aware of the manner in which some of the applications work over AWS but I am yet to explore all the greater details and aspects of AWS and how big scale projects are deployed at AWS }

 

*     Experience over Industry - standard BI platforms { this necessitates a candidate to have some good amount of experience over working over Business Intelligence and Reporting Applications like Microsoft Power Bi and Tableau where one might be able to carry out and find out report generation and deployment activities in order to find out the necessary actionable items required for the specific work }

 

*   Knowledge of SAAS products and their multitenant cloud implementation { I this area I am just aware of the fundamental theorems that are under work and implementation is still yet to be done and scaled up , so this is one area that I shall again need to brush up and get my hands upon. I shall try to learn from the available online resources and try online cloud platforms over where such projects and modules are deployed}

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 Description and Responsibilities on the job

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 *  Analyse the business problems to analytics and there upon recommending the most appropriate methods to yield insights and results

 

*  Analyse Sales and Financial Data with Cloud and Operational data to present over to the clients to view

 

*  Data Warehousing and Reporting solutions to address the growing needs for reporting , analytics , and data requirements

 *  To automate cloud metrics to analyse the business requirements and business environments and on top of that gather business requirements and create data visualizations taking into consideration PaaS , Geographical data etc .

 

 

Last modified: 13:31

Union Operation in RDBMS - Fundamental Relational Algebra Concept

 

            Union Operation - RDBMS

        Fundamental Relational Algebra Concept

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* Scenario where a Union Operation over a rdbms table could be used : -

Consider a query to find the names of all the bank customers who have either an account or a loan or both in a bank .

 

* To find the names of the customer who have an account and also a deposit account in the bank , the search query would consider the search to take over "depositor" relation table and the "borrower" relation table .

 

* In order to find out the names of all the customers with a loan in the bank , the query that could be used for the operation would be :

 

{figure-01}

The upper relational equation is a form of projection which allows us to produce the relevant relation that returns the argument relation specified within the parenthesis . So as we are interested in finding out the names of the customers who have a loan account , the

relevant result would be fetched from the projection relation as mentioned in the above statement .

 

* Similarly , if we want to know the names of all the customers with an account in the bank , then it can be expressed in the following projection equation :

 

{figure-02}

 

 

* Therefore , in order to find the answer to the raised question in our scenario that is discussed in the opening statement , one needs to do a "Union" operation over the two sets which is : we need all the customer names that appear in either both or two of the relations which can be found out by using the binary operation Union upon both the queries . The relevant relational equation can be represented in the given manner :

 

    {figure-03}

 

* The resulting relation for the query would result in a relation with the relevant tuples from both the tables

 

* The resulting relations are sets from which duplicate values are eliminated .

 

In Hindsight :

In our example , we took the union of two sets , both of which consisted of the attribute "customer_names" values . In general , one must ensure that unions are taken between compatible relations which would generate the appropriate results without duplicates.

 

* Points to note when using a Union Operation over relational sets :

 

If r is a set and s is set , and one needs to find { r U s } , If r is a set and s is set , and one needs to find { r U s } , then the conditions that should satisfy and hold for both relations

1)        The relations r and s must be of the same type and they must have the same number of attributes

 

2)   The domains of the ith attribute of r and ith attribute of s must be the same for all values of i . One may note that , both r and s are either database relations or temporary relations that are the result of relational algebra expressions as given in figure 1 and figure 2 of the article .

Big Data - Ensuring Data Integrity

 

Updating the Elements of a List in Python

 

Updating the elements of a List in Python

 

Python Pattern Programming - 23

 Python Pattern Programming - 23

Python Pattern Programming - 22

 Python Pattern Programming - 22