AccountManager

A program written to keep track of credit card accounts and their balances.

Info

Language: Python
Tools:
- Virtualenv: Used for isolating the environment I was working with in regards to dependencies.
Dependencies: fileinput, PyDAL
- fileinput: Used to allow for reading file input.
- PyDAL: Database ORM used to abstract from writing raw SQL and aid in simple schema creation.

Installation

NOTE: Some of these steps may require elevated privileges to run. Prefix the command with sudo if your account does not have the correct permission set.

Ensure that Python 2.7 and Pip are installed on the device this will be used on.

Clone repo to your desired run location

  git clone https://github.com/cmtzco/account-assignment.git

Change directory to repo folder (Following command will work if cloned into default folder name)
```
  cd account-assignment
```
Install Dependencies
```
  pip install -r requirements.txt
```

Usage

Edit input.txt, file that will store your operations (Ex. Account additions, charges, credits)
Run
```
  python run.py < input.py
```

Sample Output

    python run.py < input.txt
    John, 418889: 150
    Maddy, 318237: -750

Example operations

The following lines are examples that can be used in the input.txt file

  Add John 418889 1000
  Charge John 100
  Add Maddy 318237 1000
  Credit Maddy 300
  Credit John 50

Design Patterns

Behavorial
- Command: This was used in run.py to ensure that the application could run via CLI and take the input of a file.
- Catalog: This was used in Account.py to allow for the multiple operations that needed to be present to ensure account management.

Tradeoffs

The choice to do a catalog and command pattern allowed for a thicker model of the class that was built and a thinner controller/run script to execute the account functions on the input.
A full command pattern would have allowed me to build the input directly into the class but that would not have been as clean to manage when trying to validate STDIN.
A full catalog pattern would have been added more classes than are needed as well as not allowed for a clean controller/run script.