Name	Name	Last commit message	Last commit date
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1_single_responsibility_principle.py	1_single_responsibility_principle.py
2_open_closed_principle.py	2_open_closed_principle.py
3_liskov_substitution_principle.py	3_liskov_substitution_principle.py
4_interface_segregation_principle.py	4_interface_segregation_principle.py
5_dependency_inversion_principle.py	5_dependency_inversion_principle.py
BAD_liskov_substitution_principle.py	BAD_liskov_substitution_principle.py
BAD_open_closed_principle.py	BAD_open_closed_principle.py
README.md	README.md

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Python S.O.L.I.D Principles - Create more classes

Use SOLID principles to address design deficiencies
Some problems without SOLID
- Mixed responsibility
- Missing responsibility
- Limited reuse potential
- Not substitutable

Interface segregation
1. Helps design good classes
2. Helps write unit test cases
Liskov substitution - how subclasses extend superclasses
1. Object of superclass S can be replaced with objects of any subclass of S
2. Helps design good polymorphism
Open/closed - tuning the design
1. Open to extension means adding subclasses a needed
2. Closed to modification avoids "tweaking" the code to handle new situations
Dependency inversion - based on packaging the code
1. A direct dependency on a concrete class needs to be "inverted"
2. Depend on abstraction classes
3. Avoid concrete class name dependencies
Single responsibility - summary of other 4 principles
1. One responsibility per class
2. "A class should have one reason to change"
3. Note!! "Single" at what level of abstraction? How are the responsibilities counter?

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