लिस्ट और डिक्शनरी

marks = [78, 92, 65, 88]
print(marks[0])        # first item: 78
print(marks[-1])       # last item: 88
print(len(marks))      # how many items: 4
marks.append(71)       # add one to the end
print(marks)
marks[2] = 67          # change the third item
print(marks)

prices = {"milk": 30, "bread": 45, "eggs": 7}   # made-up prices in rupees
print(prices["bread"])          # look up by key: 45
prices["rice"] = 60             # add a new item
prices["milk"] = 32             # change a price
print(prices)
print("sugar" in prices)        # is this key there? False
print(prices.get("sugar", 0))   # get with a default: 0

prices = {"milk": 30, "bread": 45, "eggs": 7}
for item, price in prices.items():
    print(f"{item:<6} Rs {price}")

prices = {"milk": 30, "bread": 45, "eggs": 7}
cart = ["milk", "eggs", "eggs", "bread"]
total = 0
for item in cart:
    total += prices[item]
print("Bill: Rs", total)

cart = ["milk", "eggs", "eggs", "bread", "eggs"]
counts = {}
for item in cart:
    counts[item] = counts.get(item, 0) + 1
print(counts)