# ongechiosiango/banking-system architecture

> Architecture diagram of the GitHub repository ongechiosiango/banking-system, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-09-27). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/ongechiosiango/banking-system
- Repository: https://github.com/ongechiosiango/banking-system

## Overview

This is a minimal in-memory banking system. Its demonstrated workflow opens accounts, deposits money, transfers money between accounts, and prints resulting balances. The `Bank` class owns account state and implements balance-checked withdrawals and transfers; `Account` models each account using `Decimal`. The README also documents withdrawals as a user capability. `main.py` is an unrelated generated utility, not part of the banking workflow.

Main entry points: [`bank.py`](https://github.com/ongechiosiango/banking-system/blob/main/bank.py) (Bank)

## Diagram (Mermaid)

```mermaid
flowchart TD

node_user(("User"))
node_cli["Bank CLI<br/>[bank.py]"]
node_bank["Bank<br/>[bank.py]"]
node_accounts["Account State<br/>[bank.py]"]
node_account["Account<br/>[bank.py]"]

node_user -->|"runs"| node_cli
node_cli -->|"creates and operates"| node_bank
node_bank -->|"opens"| node_account
node_bank -->|"stores and updates"| node_accounts
node_bank -->|"transfer calls withdraw and deposit"| node_bank
node_cli -->|"prints balances"| node_accounts

click node_cli "https://github.com/ongechiosiango/banking-system/blob/main/bank.py"
click node_bank "https://github.com/ongechiosiango/banking-system/blob/main/bank.py"
click node_accounts "https://github.com/ongechiosiango/banking-system/blob/main/bank.py"
click node_account "https://github.com/ongechiosiango/banking-system/blob/main/bank.py"

classDef toneNeutral fill:#f8fafc,stroke:#334155,stroke-width:1.5px,color:#0f172a
classDef toneBlue fill:#dbeafe,stroke:#2563eb,stroke-width:1.5px,color:#172554
classDef toneAmber fill:#fef3c7,stroke:#d97706,stroke-width:1.5px,color:#78350f
classDef toneMint fill:#dcfce7,stroke:#16a34a,stroke-width:1.5px,color:#14532d
classDef toneRose fill:#ffe4e6,stroke:#e11d48,stroke-width:1.5px,color:#881337
classDef toneIndigo fill:#e0e7ff,stroke:#4f46e5,stroke-width:1.5px,color:#312e81
classDef toneTeal fill:#ccfbf1,stroke:#0f766e,stroke-width:1.5px,color:#134e4a
class node_user toneBlue
class node_cli,node_bank,node_accounts,node_account toneTeal
```

## Components

### Other components

- **User**
- [Bank CLI](https://github.com/ongechiosiango/banking-system/blob/main/bank.py): `bank.py`
- [Bank](https://github.com/ongechiosiango/banking-system/blob/main/bank.py): `bank.py`
- [Account State](https://github.com/ongechiosiango/banking-system/blob/main/bank.py): `bank.py`
- [Account](https://github.com/ongechiosiango/banking-system/blob/main/bank.py): `bank.py`

## Connections

- User → Bank CLI: runs
- Bank CLI → Bank: creates and operates
- Bank → Account: opens
- Bank → Account State: stores and updates
- Bank → Bank: transfer calls withdraw and deposit
- Bank CLI → Account State: prints balances