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# OLD: Parts of Python (old -- Mr. A)
## Expectations
We're going to take a tour of Python. You are expected to know generally *what* these things are, you're not yet expected to know *how* to use them. So no freaking out. We'll play around with some fun projects after a quick look around.
### Learning Targets
* I can make a hello world app in Python.
* I can differentiate between compile-time, run-time, and logic errors.
* I can describe the basic constructs of programming languages such as variables, conditionals, loops, and flow control.
### Assessments
* You will be answering comprehension questions about the layers supporting software execution.
* You will be creating and submitting your first Python app using trinket.io
Let's go to trinket.io and build some simple stuff, starting with `print("Hello, world")`
We'll go over each of these concepts in greater detail. For now, let's skim over all the big topics.
## Data Types
The first thing we'll tinker with is **declaring** variables and storing information. Variables in Python are **dynamically typed**, meaning you can store one type of information in a variable and then switch it without any fuss. Other languages are more strict and don't allow such shenanigans.
## Operations
{% embed url="" %}
We use math symbols for most common operations. But Python has some cool operators. Read!
{% embed url="" %}
## Conditionals
{% embed url="" %}
Now we're switching from declarations and operations to control flow. Now we can direct the computer's train of thought (aka its **thread**).
## Loops
{% embed url="" %}
This is how we repeat commands and **iterate** through a list or collection of items. Imagine you're using your hand to flip through posters at Walmart. Your hand selects each poster as it **traverses** the collection. That makes your hand the **iterator** as it is connecting with each object in the collection during the loop.
## Functions/Methods
A function is a set of commands you can call. When activating this "magic spell" you can pass it parameters or ingredients.
## Classes
{% hint style="danger" %}
This concept is pretty advanced. It's here as a reference point because exposure to these ideas is good (so long as you know that it's not something you need to master quite yet).
{% endhint %}
A class is how you can create your own objects. You can make an class serve as a single worker like a static library of mathematical operations or you can design your own object, like a Spaceship that can be spawned or instantiated into a game many times. It'll have its own instance variables like health and shield properties.
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