Python Classroom Series – 01/Oct/2020

Story of Taj Group (Fictional)

• Taj group has two applications from different vendors
• How can two applications exchange data?
  • We might need a data exchange format which
    • is easier to understand
    • No particular programming languages assumptions
    • Easy to read (by both humans & programs)
• Lets Start with XML:
  • Two applications should agree to a structure. This can be can be defined by xsd

    <Order>
        <from>Swiggy</from>
        <placedon>01/10/2020 18:00:00</placedon>
        <items>
            <item>Biryani Family Pack</item>
            <item>Coke </item>
        </items>
        <delivery>
            <placedon>01/10/2020 18:00:00</placedon>
            <scheduledby>01/10/2020 18:15:00</scheduledby>
        </delivery>
    </Order>
    

    
  • XML as Data Exchange Format is very widely used, but parsing xml is difficult and sizes (payload) of the xml are more in size

Json (JavaScript Object Notation)

• Data is represented as name value pairs
• Advantages:
  • It is light weight
  • Easy to read and write
• Data can be in the form of
  • Text
  • Numbers
  • Boolean
• Data can be plural or complex
• Lets try to Think of information, in terms of name value pairs. Lets try to write the info about Bahubali
  • Different Name value pairs
  • If we want to enter data in to the name value pairs the data types could be
• Basic Json Reprsentation
  • In Json Data is represented as <name>: <value>
  • Eg:

    "Hero": "Prabhas"
    

• Json Data Types: Value section might have different values. Value Types could be one of
  • String/Text: ”
  • Number
  • Boolean: true/false
  • list: represented in []
  • object (Complex): Describing this type might require some more name value pairs. Represented in { }
• Lets write a simple json to represent Bahubali

{
  "title": "Bahubali The Begining", 
  "Director": "S.S. Rajamouli",
  "Writer": "Vijayendra Prasad",
  "BoxOfficeInCrores": 600,
  "BudgetInCrores": 180,
  "Released": "10/07/2015",
  "Languages": [ "Telugu", "Tamil", "Malayalam", "Hindi" ],
  "Distributors": {
	"Telugu": "Arka Media Works",
	"Tamil": [ "StudioGreen", "Sri Thenandal Films", "UV Productions"],
	"Hindi": "Dharma Productions",
	"Malayalam": "Global United Media"
  }
}

YAML (YAML Ain’t a Markup Language)

• This also can be used for data exchanges and configurations
• Belives in indendation like python
• YAML is also collection of name value pairs
• In YAML Data is represented as <name>: <value>
• The Datatypes for Yaml are same as json.
  • Text is represented in quotes
  • List Items start with –
  • Object will start at the next indendation
• Example

---
name: 'Bahubali The Begining'
director: 'S.S. Rajamouli'
story: 'Vijayendra Prasad'
BoxOfficeInCrores: 600
BudgetInCrores: 180
Released: '10/07/2015'
Languages:
  - Telugu
  - Hindi
  - Malayalam
  - Tamil
Distributors:
  Telugu: 'Arka Media Works'
  Hindi: 'Dharma Productions'
  Tamil:
    - 'Studio Green'
    - 'Sri Thenandal Films'
    - 'UV Creations'
  Malayalam: 'Global United Media'