Transaction Logger

CIS 345 – Business Information Systems Development – II
Assignment 3: Transaction Logger
Learning Outcomes
1. Utilize modules to Read and Write from CSV Files.
2. Develop a module to utilize in another python file.
3. Implement functions to perform basic functionality.
Program Overview
Throughout the Software Development Life Cycle (SDLC) it is common to add upgrades over
time to a code file. As we add code our files become very large, less organized, and more
difficult to maintain. We have been adding upgrades for our Bank client. They have requested
the addition of the ability to log all transactions for record keeping. They require a Comma
Separated Values (.csv) file format to aid in the quick creation of reports and record keeping.
The log will be used to verify transactions are accurate. The transaction logger code will be
placed in a separate python module to avoid increasing the size of our existing code. We will
also make use of the time module to timestamp all transactions.
Instructions & Requirements
• Create a PyCharm Project using standard naming convention.
• Use your PE5 file as the starting point and download the customers.json file from
• Rename your to [ASUrite] in your project
• Create a new python module/file and name it [ASUrite]
Important Note: Before you start, make sure your PE5 file works!
Open and develop code in the new [ASUrite]_logger python module as follows:
1) Import csv to allow the functions defined in this file access to the functions needed
to write to a CSV file.
2) Define a function log_transactions( ) that accepts a data structure containing all
transactions made during the execution of the application and writes the entire data
structure to a csv file. Review CSV video lectures for ideas of a data structure used
with the csv module. This function returns nothing.

3) Move the create_pin( ) function we created in PE5 to the new
[ASUrite] file
4) (Optional) Define a function format_money( ) that accepts a decimal value and
formats it as a dollar amount adding a dollar sign, commas, and 2 decimal places.
ex. $ 15,190.77 Return the formatted dollar amount.
Modify and enhance the [ASUrite] module as follows:
5) Import your newly created logger module developed above and time. The time
module has within it a function ctime() function that returns the current time:
time.ctime(). Print it in a console to become familiar with it.
6) Declare a data structure for all transactions and initialize it with the CSV file’s
column headers (listed below and in screenshot). The data you must log later, in a
list data structure, is asfollows:
• DateTime – date and time the transaction occurred in the system
• Username – customer’s username of the account the transaction was performed
• Old Balance – account balance before the transaction
• Amount – amount of the transaction (can be positive or negative)
• New Balance – account balance after the transaction
7) Add code to save the account balance before performing the math to compete
the transaction. Place this code where it best fits the transaction process.
8) After each transaction, add all log data to the data structure you declared in step 6
(see step 6 for the list of all log data). Make use of your function in logger to format
any dollar amount or format in the [ASUrite] file so that all
dollar amounts are formatted the same using thisfunction.
9) Write the transaction data structure to a single CSV file using the logger module
function. Place this code in the best location within the code where it makes the most
sense within the business process.
Assignment-specific Submission Instructions (if any)
• CIS 345 Assignment Submission Instructions
o Uploade your [ASUrite] and [ASUrite] modules

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