05-02: Exercises — Tuples¶

Notes reference: 05-02: Tuples

Q1: Create and access¶

Create a tuple of 4 capital cities (one from Bangladesh, one from USA, one from Germany, one from Japan). Access each element.

Solution

capitals = ("Dhaka", "Washington D.C.", "Berlin", "Tokyo")
print(capitals[0])    # Dhaka
print(capitals[-1])   # Tokyo
print(len(capitals))  # 4

Q2: Immutability¶

Try to change the first element of a tuple. What error appears?

Solution

point = (3, 7)
# point[0] = 10   → TypeError: 'tuple' object does not support item assignment
print("Tuples cannot be modified after creation.")

Q3: Tuple unpacking¶

Unpack coords = (40.7128, -74.0060) (latitude and longitude of New York) into two separate variables.

Solution

coords = (40.7128, -74.0060)
lat, lon = coords
print(f"Latitude: {lat}, Longitude: {lon}")

Q4: Swap with tuple unpacking¶

Swap the values of a = "red" and b = "blue" using tuple unpacking in one line.

Solution

a, b = "red", "blue"
a, b = b, a
print(a, b)   # blue red

Q5: Function returning multiple values¶

Write a function min_max(numbers) that returns the minimum and maximum of a list as a tuple.

Solution

def min_max(numbers):
    return min(numbers), max(numbers)

lo, hi = min_max([5, 3, 9, 1, 7])
print(f"Min: {lo}, Max: {hi}")   # Min: 1, Max: 9

Q6: Tuple as dictionary key¶

Create a dictionary that maps coordinate tuples to city names.

Solution

locations = {
    (23.8103, 90.4125): "Dhaka",
    (40.7128, -74.0060): "New York",
    (52.5200, 13.4050): "Berlin",
}
print(locations[(23.8103, 90.4125)])   # Dhaka

Q7: count and index¶

Given t = (1, 2, 3, 2, 4, 2, 5), find how many times 2 appears and the index of 4.

Solution

t = (1, 2, 3, 2, 4, 2, 5)
print(t.count(2))    # 3
print(t.index(4))    # 4

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