A Story in Python Helps You Understand Itertools. Many Python developers like to use the Itertools module, which is indeed very powerful. Permutations and combinations are among the most popular functions in this module.
Many Python developers like to use the Itertools module, which is indeed very powerful. Permutations and combinations are among the most popular functions in this module.
When people learning these two terms, almost always starts from the theory. That is one of the areas in Math — Combinatorics. Then, there are many principles and formula to understand and even memories.
Screenshot from the Wikipedia Page — Permutation
Well, the theory is important, but sometimes it might not be the quickest way to apply the knowledge in practice, especially when we want to use programming to solve some problems in the real life.
For example, we are not likely to pick up red and blue balls in a bag with or without replacement. However, we’re more likely to use programming for generating a roster to plan who is on duty for something :)
In this article, I’ll introduce 4 important functions (
combinations_with_replacement()) in the Itertools module in Python, using a practical example.
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