Python Itertools: Exercises, Practice, Solution
This resource offers a total of 220 Python Itertools problems for practice. It includes 44 main exercises, each accompanied by solutions, detailed explanations, and four related problems.
Python itertools module implements a number of iterator building blocks inspired by constructs from APL, Haskell, and SML. Each has been recast in a form suitable for Python. The module standardizes a core set of fast, memory efficient tools that are useful by themselves or in combination.
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1. Iterator from Iterables
Write a Python program to create an iterator from several iterables in a sequence and display the type and elements of the new iterator.
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2. Running Product Iterator
Write a Python program that generates the running product of elements in an iterable.
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3. Max & Min from Iterable
Write a Python program to generate the maximum and minimum values of the elements of an iterable.
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4. Infinite Iterator with Step
Write a Python program to construct an infinite iterator that returns evenly spaced values starting with a specified number and step.
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5. Infinite Cycle of Elements
Write a Python program to generate an infinite cycle of elements from an iterable.
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6. Drop Until Positive
Write a Python program to make an iterator that drops elements from the iterable as soon as an element is a positive number.
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7. Drop While Negative
Write a Python program to make an iterator that drops elements from the iterable as long as the elements are negative; afterwards, it returns every element.
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8. Consecutive Keys Group
Write a Python program to create an iterator that returns consecutive keys and groups from an iterable.
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9. Split Iterable into Chunks
Write a Python program to split an iterable and generate iterables a specified number of times.
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10. Permutations Iterator
Write a Python program to create an iterator to get a specified number of permutations of elements.
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11. Combinations of Given Length
Write a Python program to generate combinations of a given length of a given iterable.
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12. Cartesian Product of Lists
Write a Python program to compute the Cartesian product of two or more given lists using itertools.
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13. Color Combinations with Repetition
Write a Python program that will select a specified number of colours from three different colours, and then generate all the combinations with repetitions.
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14. Specified Element Permutations
Write a Python program to generate permutations of specified elements drawn from specified values.
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15. All Permutations of n Objects
Write a Python program to generate all possible permutations of n different objects.
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16. Sorted Permutation Sequence
Write a Python program to find the sorted sequence from a set of permutations of a given input.
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17. String Compression
Write a Python program to read a given string character by character and compress repeated characters by storing the length of those character(s).
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18. Swapping Successive Permutations
Write a Python program to generate permutations of n items in which successive permutations differ from each other by the swapping of any two items.
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19. FizzBuzz with Itertools
Write a Python program that iterates the integers from 1 to a given number and prints "Fizz" for multiples of three, prints "Buzz" for multiples of five, and prints "FizzBuzz" for multiples of both three and five using the itertools module.
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20. Factorial using Itertools
Write a Python program to find the factorial of a number using the itertools module.
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21. Christmas Sunday Finder
Write a Python program to find the years between 2000 and 2150 when the 25th of December is a Sunday.
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22. 24-Hour Time from Digits
Write a Python program to create a 24-hour time format (HH:MM) using the 4 given digits. Display the latest time and do not use any digit more than once.
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23. Shortest Distance for Character
Write a Python program to find the shortest distance from a specified character in a given string. Return the shortest distances through a list and use an itertools component to solve the problem.
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24. Longest Uniform Substring
Write a Python program to find the maximum length of a substring in a given string where all the characters of the substring are the same. Use the itertools module to solve the problem.
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25. First Two Sum Elements
Write a Python program to find the first two elements of a given list whose sum is equal to a given value. Use the itertools module to solve the problem.
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26. Nth Hamming Number
Write a Python program to find the nth Hamming number. Use the itertools module.
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27. Unique Color Combinations
Create a Python program that chooses a specified number of colors from three different colors and generates unique combinations.
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28. Aggregation Pair (Max,Min)
Write a Python program to find the maximum, minimum aggregation pair in a given list of integers.
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29. Interleave Multiple Lists
Write a Python program to interleave multiple lists of the same length. Use the itertools module.
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30. Non-repeated Cartesian Combinations
Write a Python program to create non-repeated combinations of the Cartesian product of a given list of four numbers.
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31. Count Consecutive Duplicates
Write a Python program to count the frequency of consecutive duplicate elements in a given list of numbers. Use the itertools module.
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32. Frequency of Unordered List
Write a Python program to count the frequency of the elements of a given unordered list.
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33. Max-Min Product Pairs
Write a Python program to find pairs of maximum and minimum products from a given list. Use the itertools module.
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34. Sum of Digits for Each Number
Write a Python program to compute the sum of digits of each number in a given list of positive integers.
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35. All Combinations of List Elements
Write a Python program to get all possible combinations of the elements of a given list using the itertools module.
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36. Add Lists from Right
Write a Python program to add two given lists of different lengths, starting from the right, using the itertools module.
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37. Add Lists from Left
Write a Python program to add two given lists of different lengths, starting from the left, using the itertools module.
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38. Interleave Different Length Lists
Write a Python program to interleave a number of lists of different lengths using the itertools module.
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39. Index of First Greater Element
Write a Python program to get the index of the first element that is greater than a specified element using the itertools module.
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40. Split List into Chunks
Write a Python program to split a given list into specified sized chunks using the itertools module.
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41. Mixed Case Combinations
Write a Python program to find all lower and upper mixed case combinations of a given string.
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42. Group Similar Items
Write a Python program to create groups of similar items from a given list.
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43. Max Difference Between Pairs
Write a Python program to find the maximum difference between pairs in a given list.
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44. Extract Non-zero Block
Write a Python program to extract a non-zero block from a given integer list.
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