Python Projects for Beginners a ten-Week Bootcamp Approach to Python Programming

User Database with CSV Files.”

Final Design

This week’s project is all about logic. We need to understand how to set up a step-by- step process for logging users in and out. There are three main parts to this program, registering a user, logging a user in, and the main loop that will run the program. Knowing that the first two are tasks, we can make functions out of them and call them when necessary in the main loop. Let’s go ahead and lay out the logical process for this program:
1. Check to see if user is logged in.

1. 
   If logged in, ask if they would like to log out/quit.
   
   1. 
      Either quit or log out user and restart.
      
2. 
   Else, ask if they would like to log in/register/quit.
   
   1. 
      If log in, ask user for e-mail/password.
      
      1. 
         If correct, log user in and restart.
         
      2. 
         Else, display error and restart.
         
   2. 
      If register, ask for e-mail/password/password2.
      
      1. 
         If passwords match, save user and restart.
         
      2. 
         Else, display error and restart.
         
   3. 
      If quit, say thank you and exit program.
      

This is the program flowchart for our main loop. Now that you know exactly how the program should run, I urge you to try and build it yourself before continuing. By doing so, you’ll be able to reference my code, see where you may have made mistakes, etc. The loop will continue to run until the user quits and allow them to register or log in. Once logged in, you’ll only be able to log out or quit. It’s simple but will provide some insight on how to handle menu systems.

Setting Up Necessary Imports

First, let’s start by importing the necessary files and functions we need to run the program:

1| # import all necessary packages to be used
2| import csv
3| from IPython.display import clear_output

We’ll be writing all the code in a single cell, so no need to run the cell right now. We’ve gone ahead and imported the CSV library to be able to work with CSV files, as well as the clear output function that allows us to clear our notebook statements from the cell.