Python PetStore Exercise 1

Goals

Create the base classes for the store.
Interact with the classes by making some objects and running basic logic on them.
Learn how to make a console app wait for certain input before exiting a loop.

Instructions

Clone this repo. Ensure that you have a main.py that contains an empty main().
Add the entrypoint for running your main.py by adding the following to the bottom of the file:
```
if __name__ == "__main__":
    main()
```
Add a class to your project called Product. You can add it directly into the main.py file if you want to; remember it needs to be outside of main(). This class will be what's called a base class or a parent class. This will be the most basic class that all product classes will inherit from. Ref: Python docs on classes
Add a constructor to your Product class by creating a method inside called __init__ by doing: def __init__(self):.
- Note: Remember that self must be the first parameter for your constructor. This allows the single instance to reference it's own variables and methods, i.e. "When one cat meows, not all cats meow."
Add the following parameters to your __init__() constructor:
- name - Type str
- price - Type float
- quantity - Type int
- description - Type str Example is as follows:
```
def foo(bar1: str, bar2: float, bar3: int):
     ...
```
Inside your __init__() constructor please assign the passed arguments to instance variables; this will make sure the arguments you pass in are available in the instance:
```
def foo(bar1: str, bar2: float, ...):
    self.bar1 = bar1
    ...
```
Add another class called CatFood. Make this class inherit from the base class Product. Example:
```
# FooClass inherits from BarClass
class FooClass(BarClass):
    ...
```
Please give CatFood a few Properties. You can do so by following the same process of building a constructor __init__() inside of CatFood and assigning it's arguments to instance variables as you did with Product.
- WeightPounds - Type float
- KittenFood- Type bool
Make another class called DogLeash and have it inherit from Product as well. Give it a the following Properties
- LengthInches - Type int
- Material - Type str

Looping

Now we want to get this app to run until the user decides to end it. We will do this by using a while loop. Loops require 3 things: an inital condition, check in condition, and a change in condition. Our inital condition is going to be our first input from the user. Our check is what is in the while loop. Our change is going to be what the user inputs after an action has been complete. So, let's get started with the initial condition.

Inside our main() in main.py, add the following lines: print("Press 1 to add a product") and below that add print"Type 'exit' to quit").
Add this line of code directly below your print() lines: userInput = str(input("Option: ")). This will get what the user enters before hitting enter.
Now add your while loop which typically in the form of while( <some conditional expression> ), e.g. while(some_variable < 5). The condition in the loop should be something like this: userInput.lower() != "exit". We use the method lower() just in case the user enters "Exit" instead of "exit".
Inside the body of the while loop, at the bottom of the loop, add this line userInput = str(input("Option: ")). This is our change in condition. We will add code before this though, so it will make more sense after that. Add the instructions for the console app above that line again: print("Press 1 to add a product") and print("Type 'exit' to quit").
Inside of the while loop, above the latest print() and input() lines you added in the previous step, add an if statement. This if statment will check the input of the user a second time to see if they wanted to add a product. We told them to enter "1" to add a product, so check for that in the if statment. Remember, the input is a str type, not an int.
Create a new object. It should be CatFood or DogLeash, not the base class Product. Ref: An example code snippet on making classes & objects
Since we don't really have a database, when we add a product, we're going to just create that object and print it to the console. Use print() and input() to get data from the user and then add it to the object you just created.
To make printing the object easier, we'll use json.dumps() and print(). You don't need to know all the ins and outs of how this works right now, but basically it will just convert our object to a json object. Add the following line to your code: print(json.dumps(dogLeash)). You will replace dogLeash with whatever you named your object.
Now, all you have to do is test it! Run the application and see if everything works properly.

cypher4859/python-petstore-1

Python PetStore Exercise 1

Goals

Instructions

Looping