حلقه‌ها: for، enumerate، sum و all

products = {
    'pen': {'buy': 10, 'sell': 15, 'qty': 3},
    'pencil': {'buy': 4, 'sell': 7, 'qty': 20},
}
total_qty = 0
for name, p in products.items():
    total_qty += p['qty']

names = ['Blue Pen', 'Pencil', 'Red Pen', 'Cup']
query = 'pen'
found = []
for name in names:
    if query in name.lower():
        found.append(name)

sales = [
    {'name': 'pen', 'qty': 2, 'total': 30},
    {'name': 'pencil', 'qty': 5, 'total': 35},
]
count = sum(s['qty'] for s in sales)
income = sum(s['total'] for s in sales)