Create app.py

app.py

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+import streamlit as st
+
+# ------------------------
+# Bank Account OOP Section
+# ------------------------
+
+class BankAccount:
+    def __init__(self, account_number, owner, balance=0.0):
+        self.account_number = account_number
+        self.owner = owner
+        self.balance = balance
+
+    def deposit(self, amount):
+        if amount > 0:
+            self.balance += amount
+            return f"Deposited {amount} to {self.owner}'s account."
+        return "Invalid deposit amount."
+
+    def withdraw(self, amount):
+        if 0 < amount <= self.balance:
+            self.balance -= amount
+            return f"Withdrew {amount} from {self.owner}'s account."
+        return "Insufficient balance or invalid amount."
+
+    def to_dict(self):
+        return {
+            "Account Number": self.account_number,
+            "Owner": self.owner,
+            "Balance": f"${self.balance:.2f}"
+        }
+
+class Bank:
+    def __init__(self):
+        self.accounts = {}
+
+    def create_account(self, account_number, owner):
+        if account_number in self.accounts:
+            return "Account number already exists."
+        self.accounts[account_number] = BankAccount(account_number, owner)
+        return f"Account created for {owner}."
+
+    def get_account(self, account_number):
+        return self.accounts.get(account_number)
+
+    def get_all_accounts(self):
+        return [acc.to_dict() for acc in self.accounts.values()]
+
+
+# ------------------------
+# Streamlit UI Section
+# ------------------------
+
+# Initialize session state for bank
+if "bank" not in st.session_state:
+    st.session_state.bank = Bank()
+
+st.title("🏦 Simple Bank Account Manager")
+
+menu = st.sidebar.radio("Select Action", ["Create Account", "Deposit", "Withdraw"])
+
+if menu == "Create Account":
+    st.subheader("🧾 Create New Bank Account")
+    acc_num = st.text_input("Enter Account Number")
+    owner = st.text_input("Enter Owner's Name")
+    if st.button("Create Account"):
+        if acc_num and owner:
+            message = st.session_state.bank.create_account(acc_num, owner)
+            st.success(message)
+        else:
+            st.warning("Please fill all fields.")
+
+elif menu == "Deposit":
+    st.subheader("💰 Deposit to Account")
+    acc_num = st.text_input("Enter Account Number")
+    amount = st.number_input("Enter Amount", min_value=0.0)
+    if st.button("Deposit"):
+        account = st.session_state.bank.get_account(acc_num)
+        if account:
+            message = account.deposit(amount)
+            st.success(message)
+        else:
+            st.error("Account not found.")
+
+elif menu == "Withdraw":
+    st.subheader("💸 Withdraw from Account")
+    acc_num = st.text_input("Enter Account Number")
+    amount = st.number_input("Enter Amount", min_value=0.0)
+    if st.button("Withdraw"):
+        account = st.session_state.bank.get_account(acc_num)
+        if account:
+            message = account.withdraw(amount)
+            st.success(message)
+        else:
+            st.error("Account not found.")
+
+# ------------------------
+# Display Account List
+# ------------------------
+
+st.divider()
+st.subheader("📋 All Bank Accounts")
+accounts = st.session_state.bank.get_all_accounts()
+
+if accounts:
+    st.table(accounts)
+else:
+    st.info("No accounts created yet.")
+