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SOLID Design Principle (Acroname some principles overlay with diff view…

- - - - help design good classes
      - helps writing unit tests
      - helps to figure out how classes extend superclasses (2)
    - - client(user) shouldn't be forced to use method which it doesn't need
      - or the interface should be as narrow as possible, so that client
        client is dependable to smallest set of interface features or attributes
      - generic features should be separate from specific features
      - encourages the use of builder functions and factory functions
        
        isolate a complex structure
        
        diff builder for diff structures
      - Suggest Wrap a generic interface the Extend
        but Not best for Python
        usually in python Extend works better Python's duck typing(automatic interface) is helpful here
    - - ignores this principle
      - doesn't have type checking, and doesn't check
        if a collaborator is compatible
      - manually interface segregation
  - - - Strong behavioural sub typing
      - sub-classes object should be able to replace super-class object
      - Unit test are required to check Liskov substitution holds
      - It helps to articulate design concerns by : rethink or refactor