data_entry.py

from datetime import datetime

date_format = "%d-%m-%Y"
allowed_categories = {"I": "Income", "E": "Expense"}

def get_date(prompt, allow_default=False):
    date_str = input(prompt)
    if(allow_default and not date_str):
        return datetime.today().strftime(date_format)

    try:
        valid_date = datetime.strptime(date_str, date_format)
        return valid_date.strftime(date_format)
    except ValueError:
        print("Invalid date format. Please enter a valid date (dd-mm-yyyy).")
        return get_date(prompt, allow_default)

def get_amount():
    try:
        amount = float(input('Enter the amount: '))
        if amount <= 0:
            raise ValueError("Please enter a valid amount.")
        return amount
    except ValueError as e:
        print(e)
        return get_amount()

def get_category():
    category = input("Enter the category ('I' for Income, 'E' for Expense): ").upper()
    if(category not in allowed_categories):
        print("Please enter a valid input.")
        return get_category()
    else:
        return allowed_categories[category]

def get_description():
    description = input("Enter a Description (optional): ")
    if(description):
        return description
    else:
        return "N/A"