Assignment 2 – Writing Programs
Python Intro
We need to cover some basic Python skills before getting started.
Indenting
Unlike most other programming, indenting (typically 4 spaces) matters in python.
1. Code the following
a. You’ve seen the print() statement and can probably logic through most of the code but if not, don’t worry about it, just note the error due to improper indenting
2. Fix the indenting and run the program to prove it works. Screen Capture #1 (2 point)
While it is not imperative you understand all the syntax that made up this app, there are a few things you should be aware of:
• Each line of our app is called a statement and each statement performs a task.
• The first line of the app is called the shebang line and it starts with the hash (#) and bang (!) and is used to identify which interpreter to use.
o It is not required in Windows apps but is considered good practice.
Comments
• Comments start with the # symbol and are ignored by the compiler.
a. The # can be used to comment out a full line or inline to comment out everything after the # symbol.
• Comments are used to document what a portion of the code does.
3. Add the following comments: Screen Capture #2 (2 point)
Functions
Functions are pieces of reusable code that performs a specific task. There are built-in functions, like the print() and input() and you can also create user defined functions.
We’ll be creating our own later but for now we’ll just work with some of the built-in functions.
Variables and Data Types
We use variables to store data and you might not have realized but we’ve already been using variables throughout this assignment. In our example, random_number, your_guess and count are all variables that we use to hold values we’ll later use in our application.
Unlike most popular languages today, Python is known as “Dynamically Typed”. What that means is in languages like C#, Java, etc., when variables are created, they are created with a data type (i.e. string, whole number, decimal number, boolean, etc.). But Python is different as in our previous example, we just created the variables and the data type gets set when we assign a value to it. On top of that, it’s possible for the variable to change data type based on the assignment.
4. Code as follows:
a. type() is a Python function that returns the data type if a variable Screen Capture #3 (1 point)
Naming Variables
Python has rules for naming variables:
• Must begin with a letter or underscore
• Can’t contain spaces, punctuation, or special characters other than the underscore
• Can’t begin with a number, but can have numbers in the name
• Can’t be the same as a Python reserved keyword.
Additionally, there are recommendations for naming Python variables.
• Start with lowercase letters
• Use underscore notations or camel case. (i.e. camel_case or camelCase)
• Use meaningful names
• Don’t use Python built-in names (i.e. type(), print(), etc.)
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