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Python practice problems help beginners to become experts in a python programming language with a small amount of practice effort.
Write a Python program to calculate the average of a list.
[3, 5, 7, 2, 6, 12, 3]
5.428571428571429 5.43
sum / len.numbers = [3, 5, 7, 2, 6, 12, 3]avg = sum(numbers) / len(numbers)print(avg, round(avg, 2))5.428571428571429 5.43
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Write a Python program to find the difference between consecutive numbers.
[1, 1, 3, 4, 4, 5, 6, 7]
[0, 2, 1, 0, 1, 1, 1]
zip the list with itself shifted by one.numbers = [1, 1, 3, 4, 4, 5, 6, 7]print([b - a for a, b in zip(numbers, numbers[1:])])[0, 2, 1, 0, 1, 1, 1]
zip(numbers, numbers[1:]) gives each pair of neighbours.
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Write a Python program to extract the strings of a given length.
["Python", "Sqatools", "Practice", "Program", "test", "list"], size 8
['Sqatools', 'Practice']
len().words = ["Python", "Sqatools", "Practice", "Program", "test", "list"]print([w for w in words if len(w) == 8])['Sqatools', 'Practice']
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Write a Python program to sort a list of sublists by the sum of each sublist.
[[3, 5, 6], [2, 1, 3], [5, 1, 1], [1, 2, 1], [0, 4, 1]]
[[1, 2, 1], [0, 4, 1], [2, 1, 3], [5, 1, 1], [3, 5, 6]]
sorted with key=sum.data = [[3, 5, 6], [2, 1, 3], [5, 1, 1], [1, 2, 1], [0, 4, 1]]print(sorted(data, key=sum))[[1, 2, 1], [0, 4, 1], [2, 1, 3], [5, 1, 1], [3, 5, 6]]
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Write a Python program to find the maximum and minimum numbers in a list that also contains strings.
["Sqa", 6, 5, 2, "Tools"]
[6, 2]
data = ["Sqa", 6, 5, 2, "Tools"]nums = [x for x in data if isinstance(x, (int, float))]print([max(nums), min(nums)])[6, 2]
Comparing a string with a number raises TypeError, so the strings are filtered out first.
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Write a Python program to make the first and last letters of each word uppercase, and also print every word in lowercase.
["Learn", "python", "From", "Sqa", "tools"]
['LearN', 'PythoN', 'FroM', 'SqA', 'ToolS'] ['learn', 'python', 'from', 'sqa', 'tools']
words = ["Learn", "python", "From", "Sqa", "tools"]print([w[0].upper() + w[1:-1] + w[-1].upper() for w in words])print([w.lower() for w in words])['LearN', 'PythoN', 'FroM', 'SqA', 'ToolS'] ['learn', 'python', 'from', 'sqa', 'tools']
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Write a Python program to join two lists of lists item by item.
[[1, 3], [5, 7], [9, 11]], [[2, 4], [6, 8], [10, 12, 14]]
[[1, 3, 2, 4], [5, 7, 6, 8], [9, 11, 10, 12, 14]]
zip the outer lists and concatenate each pair.a = [[1, 3], [5, 7], [9, 11]]b = [[2, 4], [6, 8], [10, 12, 14]]print([x + y for x, y in zip(a, b)])[[1, 3, 2, 4], [5, 7, 6, 8], [9, 11, 10, 12, 14]]
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Write a Python program to create a 3 × 3 grid where every row is [4, 5, 6].
[[99, 5, 6], [4, 5, 6], [4, 5, 6]]
grid = [[4, 5, 6] for _ in range(3)]grid[0][0] = 99print(grid)[[99, 5, 6], [4, 5, 6], [4, 5, 6]]
Changing one row proves the rows are independent.
[[4, 5, 6]] * 3 repeats the same list object three times, so changing one row would change all of them.
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Write a Python program to select 4 random numbers from a list.
[1, 4, 5, 7, 3, 2, 9]
[3, 5, 2, 1] 9
random.sample picks without repeats; seed for repeatable output.import random random.seed(5)numbers = [1, 4, 5, 7, 3, 2, 9]print(random.sample(numbers, 4))print(random.choice(numbers))[3, 5, 2, 1] 9
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Write a Python program to insert an item at a specific position.
[2, 4, 6, 8, 3, 22], index 3, item 55
[2, 4, 6, 55, 8, 3, 22]
insert(index, item).items = [2, 4, 6, 8, 3, 22]items.insert(3, 55)print(items)[2, 4, 6, 55, 8, 3, 22]
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