Python Classroom Notes – 16/April/2024

Different Types of Applications

• Standalone Applications and Client Side Applications
  • Command line Applications
  • Desktop Applications
  • Mobile Apps
• Server Side Applications
  • Web Applications
  • Web APIs
• Integrations
  • Message Queues
  • Pub sub

Scope of our discussion in Python

• Writing logic
• Building CLI and APIs in Python
• Leverage cloud to build decent applications (Serverless)
• Persistence using
  • Relational Databases
  • NOSQL Databases
• Integrations

Story of our Programming journey

• Our Friend Ishika

Introduction of our communication

• Ishika can remember values, but you have to tell to remember by giving a name and value

Remeber hyderabad with alias/name city

• Ishika knows how to

  • add +
  • mul *
  • sub –
  • divide /
  • remainder (modulus) %

• To make ishika add numbers

Hi ishika
Remeber 2 as num1
Remember 4 as num2
add num1 adn num2 and tell me result

• Ishika executes what you said sentence by sentence

• Lets make ishika multiply numbers

Hi ishika
Remeber 2 as num1

Add num1, num1 and remember result 
Add result, num1 and remember result

• Lets try to make ishika tell if the number is even or odd (+ – * / %)

Remeber 21 as number
perform number % 2 and store result
if result is zero say even else odd

• Lets add sum of all numbers 369 => 3 + 6 + 9. Ishika knows + - * / %

Hi ishika
Remember 369 as number
calculate number % 10 and store in value1  (369%10 = 9 => )
calucualte number / 10 and store in number
calculate number % 10 and store in value2  (36%10 = 6 => )
calucualte number / 10 and store in number
now add number, value1 and value 2 

• Lets make ishika calculate sum of any number

Hi ishika
Remember 3691 as number
Remember 0 as sum
until number not equals 0 try below steps
    calculate number%10 and add it to sum
    calculate number/10 and assign it to number
end until
say sum

• Exercise: i have invested 10 lakhs in a mutual fund which gave 12% returns. I have invested 10 lakhs when i was 24 years old now i’m 60 what is the total amount. Refer Here. Find the forumla for lumpsum returns calculation.

• Operators:

  • Assignment: number = number%10 => calcuate number mod 10 and assign it to number
  • equals =
  • not equals !=
  • greater than lt, lte, gte > < <= >=

Debugging

• consider the below conversation

Hi ishika
Remember 19835 as number
Remember 0 as sum
until number not equals 0 try below steps
    calculate number%10 and add it to sum
    calculate number/10 and assign it to number
end until
say sum

References

• Project Euler Refer Here
• Hacker Rack Refer Here