Expense Handler Application with advance technologies

Budget Planner 

One of the application developed with Ionic 4 and Python-Flask. 

Ionic 4 code: https://github.com/logeshbuiltin/ExpenseHandlerApp

Python Code: https://github.com/logeshbuiltin/ShopManagement

Here we have used a new technologies to understand how it works and the advantages.

Sample code for Authorization in Python

Achieving Authorization using JWT in Python

Here we are going to access an get API using python authorization by checking the username, password and generating JWT token.

kindly install below packages to proceed with the code.

install flask_jwt 

install flask_restful 

install flask 

once the above steps has been completed, we will be created three files 

app.py - main application file

security.py - security file

user.py - user

Code: app.py

Code: security.py

Code: user.py

If you need further explanation, kindly mention in the comments so that i can give a brief on code flow.

   

Windows BCD error code 0x0000098

Windows BCD error and it works and your files will be safe

File:\BCD
Error code: 0x0000098

Note:
If you are using windows genuine version kindly insert the installation media and follow the below steps:
-Start up your computer with the USB or DVD Windows 10 recovery media.
-Select your language time format and keyboard and click next.
-Click (repair now) then (troubleshoot), windows will automatically try to repair your system.

If you are using non-licensed version:


Start your computer and enter F11 and select the trouble shoot option

select Command prompt and enter the below commands:

C:\diskpart 
and press enter.

DISKPART> list disk 
and press enter to know which drive to target.

DISKPART> sel disk 0 
assuming your drive with windows is disk 0 and press enter.

DISKPART> list vol 
to view all the partitions and press enter.

Select the EFI partition volume which is using FAT32 next to the NTFS volume

DISKPART> sel vol 2
to select the fat32 EFI volume and press enter.

DISKPART> assign letter=m 
to assign an arbitrary drive letter to it and press enter.

DISKPART> Exit 
to exit the diskpart tool and press enter.

> cd /d m:\EFI\Microsoft\Boot\  
press enter

> bootrec /fixboot 
press enter

> ren BCD BCD.old 
and enter to backup the existing Boot Configuration Data
(BCD) store.

> bcdboot c:\Windows /l en-us /s m: /f ALL 
press enter to recreate the BCD store.

Close the command prompt windows then turn off pc and restart the computer.

parameters are of unsupported type sqlite python

Details:

This is one of the common error a beginner will be facing when he is working on Python and SQLite bridging. Below is a scenario provided for better understanding with example.

Error:

insert_data = "INSERT INTO users VALUES (?, ?, ?)"

    user = [

        {1, "Ram", "abc@123"},

        {2, "Rahim", "wel@123"},

        {3, "Raju", "pass@123"}

    ]

    cursor.executemany(insert_data, user)

When you run the above code you will get the error:

(venv) D:\python\Course_sample\source_database>python dataBase.py

parameters are of unsupported type

This is because when ever we try to insert into database from python, they data has to be a tuple.

In the above code you can see list of set which we try to insert.

Fixed:

#insert data query

    insert_data = "INSERT INTO users VALUES (?, ?, ?)"

    user = [

        (1, "Ram", "abc@123"),

        (2, "Rahim", "wel@123"),

        (3, "Raju", "pass@123")

    ]

    cursor.executemany(insert_data, user)

The above code will get executed and the data will get inserted into the database properly.

Lambda in python with example

Lambda:

In the below example you can see two methods have been created and clearly explained to show how Lambda works

friends =  [

    {"name": "Ram", "age":26}, 

    {"name": "Raju", "age":30}

]

#method with for loop 

def findAge(name):

    for friend in friends:

        if(friend["name"] == name):

            return friend

    

    return f"{name} not found"

#method with Lambda expression 

def findAgeLambda(name):

    friend = next(filter(lambda x: x["name"] == name, friends))

    return friend

print(findAge("Ram"))

print(findAgeLambda("Raju"))  

Output:

{'name': 'Ram', 'age': 26}

{'name': 'Raju', 'age': 30}

Difference between Set, List and Tuple in python

Set:

• (regressive)unordered list of data
• Mutable unordered(regressive) set of values
• initialized using emptySet = set()
• Every element is unique
• A set is created by placing all items inside {}
• Eg: my_set = {1, 2, 3}

List:

• Ordered list of data
• Mutable ordered set of values
• Initialized using list = []
• can contain duplicate
• A list is created by placing all items inside []
• Eg: my_list = [1,2,3]

Tuple:

• Ordered list of data
• Immutable set of values
• Initialized using tuple = ()
• can contain duplicate
• A tuple is created by placing all items inside ()
• Eg: my_tuple = (1,2,3)

class composition in python with example

Composition is a concept that models a has a relationship. It enables creating complex types by combining objects of other types. This means that a class Composite can contain an object of another class Component. This relationship means that a Composite has a Component.

Example:

class Garage:

    def __init__(self, *cars):

        self.cars = cars

    def __str__(self):

        return (f"Total {len(self.cars)} cars in the Garage")

class Cars:

    def __init__(self, name, year):

        self.name = name

        self.year = year

    def __str__(self):

        return ("{} is moving to Garage in {}".format(self.name, self.year))

car = Cars("Ferrari", "2019")

car2 = Cars("Rolls", "2020")

car3 = Cars("Benz", "2021")

garage = Garage(car, car2, car3)

print(car)

print(car2)

print(car3)

print(garage)

Output:

Ferrari is moving to Garage in 2019
Rolls is moving to Garage in 2020
Benz is moving to Garage in 2021

Total 3 cars in the Garage