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Python Dictionary Practice Problems.
Write a Python program to multiply all the values of a dictionary.
{"a": 2, "b": 4, "c": 5}40
math.prod(d.values()).import mathprint(math.prod({"a": 2, "b": 4, "c": 5}.values()))40
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Write a Python program to create a dictionary with keys 1 to 5 and their squares as values.
{1: 1, 2: 4, 3: 9, 4: 16, 5: 25}print({k: k * k for k in range(1, 6)}){1: 1, 2: 4, 3: 9, 4: 16, 5: 25}New to this topic? Read the lesson, then come back.
Write a Python program to insert a key at the beginning of a dictionary.
{"course": "python", "institute": "sqatools"}, insert ("name", "omkar"){'name': 'omkar', 'course': 'python', 'institute': 'sqatools'}d = {"course": "python", "institute": "sqatools"}d = {"name": "omkar", **d}print(d){'name': 'omkar', 'course': 'python', 'institute': 'sqatools'}New to this topic? Read the lesson, then come back.
Write a Python program to create {k: k³} for k from 1 to n.
n = 4
{1: 1, 2: 8, 3: 27, 4: 64}range(1, n + 1).n = 4print({k: k ** 3 for k in range(1, n + 1)}){1: 1, 2: 8, 3: 27, 4: 64}New to this topic? Read the lesson, then come back.
Write a Python program to loop over a dictionary and print each key and value.
{"food": "burger", "type": "fast food"}food : burger type : fast food
for k, v in d.items().d = {"food": "burger", "type": "fast food"}for key, value in d.items(): print(key, ":", value)food : burger type : fast food
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Write a Python program to check whether a key exists in a dictionary.
{"city": "pune", "state": "maharashtra"}, key "country"country does not exist city exists
in checks keys.d = {"city": "pune", "state": "maharashtra"}for key in ["country", "city"]: print(key, "exists" if key in d else "does not exist")country does not exist city exists
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Write a Python program to get the memory size of a dictionary with sys.getsizeof, and its number of items.
{"name": "virat", "sport": "cricket"}2 items True | bytes on this Python: 184
sys.getsizeof gives the size of the dict object itself, len the item count.import sys d = {"name": "virat", "sport": "cricket"}print(len(d), "items")print(sys.getsizeof(d) > 0, "| bytes on this Python:", sys.getsizeof(d))2 items True | bytes on this Python: 184
The byte count depends on the Python version and platform, and it does not include the keys and values themselves.
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Write a Python program to add up all the values of a dictionary.
{"x": 23, "y": 10, "z": 7}40
sum(d.values()).print(sum({"x": 23, "y": 10, "z": 7}.values()))40
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Write a Python program to swap the values of two keys.
{"name": "yash", "city": "pune"}{'name': 'pune', 'city': 'yash'}d = {"name": "yash", "city": "pune"}d["name"], d["city"] = d["city"], d["name"]print(d){'name': 'pune', 'city': 'yash'}New to this topic? Read the lesson, then come back.
Write a Python program to add a key to a dictionary.
{1: "a", 2: "b"}{1: 'a', 2: 'b', 3: 'c'}d = {1: "a", 2: "b"}d[3] = "c"print(d){1: 'a', 2: 'b', 3: 'c'}New to this topic? Read the lesson, then come back.