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Python Itertools: Exercises, Practice, Solution

Python Itertools [42 exercises with solution]

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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.

1. Write a Python program to create an iterator from several iterables in a sequence and display the type and elements of the new iterator. Go to the editor
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2. Write a Python program to generate the running product of the elements of an given iterable. Go to the editor
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3. Write a Python program to generate the running maximum, minimum value of the elements of an iterable. Go to the editor
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4. Write a Python program to construct an infinite iterator that returns evenly spaced values starting with a specified number and step. Go to the editor
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5. Write a Python program to generate an infinite cycle of elements from an iterable. Go to the editor
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6. Write a Python program to make an iterator that drops elements from the iterable as soon as an element is a positive number. Go to the editor
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7. Write a Python program to make an iterator that drops elements from the iterable as long as the elements are negative; afterwards, returns every element. Go to the editor
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8. Write a Python program to create an iterator that returns consecutive keys and groups from an iterable. Go to the editor
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9. Write a Python program to split an iterable and generate iterables specified number of times. Go to the editor
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10. Write a Python program to create an iterator to get specified number of permutations of elements. Go to the editor
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11. Write a Python program to generate combinations of a given length of given iterable. Go to the editor
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12. Write a Python program to create Cartesian product of two or more given lists using itertools. Go to the editor
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13. Write a Python program to chose specified number of colours from three different colours and generate all the combinations with repetitions. Go to the editor
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14. Write a Python program generate permutations of specified elements, drawn from specified values. Go to the editor
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15. Write a Python program to generate all possible permutations of n different objects. Go to the editor
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16. Write a Python program find the sorted sequence from a set of permutations of a given input. Go to the editor
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17. Write a Python program to read a given string character by character and compress repeated character by storing the length of those character(s). Go to the editor
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18. 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. Go to the editor
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19. Write a Python program which iterates the integers from 1 to a given number and print "Fizz" for multiples of three, print "Buzz" for multiples of five, print "FizzBuzz" for multiples of both three and five using itertools module. Go to the editor
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20. Write a Python program to find the factorial of a number using itertools module. Go to the editor
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21. Write a Python program to find the years where 25th of December be a Sunday between 2000 and 2150. Go to the editor
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22. Write a Python program to create a 24-hour time format (HH:MM ) using 4 given digits. Display the latest time and do not use any digit more than once. Go to the editor
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23. 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 itertools module to solve the problem. Go to the editor
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24. Write a Python program to find the maximum length of a substring in a given string where all the characters of the substring are same. Use itertools module to solve the problem. Go to the editor
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25. Write a Python program to find the first two elements of a given list whose sum is equal to a given value. Use itertools module to solve the problem. Go to the editor
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26. Write a Python program to find the nth Hamming number. User itertools module. Go to the editor
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27. Write a Python program to chose specified number of colours from three different colours and generate the unique combinations. Go to the editor
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28. Write a Python program to find the maximum, minimum aggregation pair in given list of integers. Go to the editor
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29. Write a Python program to interleave multiple lists of the same length. Use itertools module. Go to the editor
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30. Write a Python program to create non-repeated combinations of Cartesian product of four given list of numbers. Go to the editor
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31. Write a Python program to count the frequency of consecutive duplicate elements in a given list of numbers. Use itertools module. Go to the editor
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32. Write a Python program to count the frequency of the elements of a given unordered list. Go to the editor
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33. Write a Python program to find the pairs of maximum and minimum product from a given list. Use itertools module. Go to the editor
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34. Write a Python program to compute the sum of digits of each number of a given list of positive integers. Go to the editor
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35. Write a Python program to get all possible combinations of the elements of a given list using itertools module. Go to the editor
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36. Write a Python program to add two given lists of different lengths, start from right , using itertools module. Go to the editor
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37. Write a Python program to add two given lists of different lengths, start from left , using itertools module. Go to the editor
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38. Write a Python program to interleave multiple given lists of different lengths using itertools module. Go to the editor
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39. Write a Python program to get the index of the first element, which is greater than a specified element using itertools module. Go to the editor
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40. Write a Python program to split a given list into specified sized chunks using itertools module. Go to the editor
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41. Write a Python program to find all lower and upper mixed case combinations of a given string. Go to the editor
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42. Write a Python program to create group of similar items of a given list. Go to the editor
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Python: Tips of the Day

Python: Enum Class

Here is another classy approach from Python, no pun intended. Python's enum class will let you create enum object members with constant and unique values which then can be listed, compared or used for identification.

Enum classes are also iterable so they can be iterated as well:

from enum import Enum
class sports(Enum):
    volleyball = 1
    soccer = 2
    running = 3
    football = 4
    baseball = 5
    boxing = 6
print(sports.baseball)
print(repr(sports.baseball))

Output:

sports.baseball
<sports.baseball: 5>