Скачать или смотреть How to Print a Checkerboard in Python without Numpy

Learn how to create a `checkerboard` pattern using Python arrays without any external libraries like Numpy. Discover an efficient method to tackle this common coding problem.
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This video is based on the question https://stackoverflow.com/q/66804045/ asked by the user 'Squishy' ( https://stackoverflow.com/u/15113742/ ) and on the answer https://stackoverflow.com/a/66804294/ provided by the user 'Eitan Rosati' ( https://stackoverflow.com/u/14931292/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Printing a Checkerboard in Python without Numpy

Creating visual patterns like a checkerboard can be a fun exercise when learning programming. You might find yourself faced with a task to print a checkerboard pattern using arrays in Python, without the help of libraries such as Numpy. In this guide, we’re going to walk through the problem of printing a checkerboard pattern and then dive into a solution using simple Python code.

The Problem Explained

The challenge is to print a checkerboard pattern that looks like this:

[[See Video to Reveal this Text or Code Snippet]]

As you can see, the pattern alternates between X and 0. The primary difficulty arises in ensuring that the characters are placed correctly in a two-dimensional array format.

Understanding the Initial Code

The initial code provided had a few fundamental issues. Here’s a breakdown of what went wrong:

Attempting to use list elements as indices led to a TypeError. Specifically, the code line Checkerboard[i][j] = "X" failed because i and j weren’t being used correctly as indices.

The structure for iterating through the array used the element itself instead of its index, which resulted in incorrect references.

Solution: A Revised Approach

Let’s tackle the problem with a fresh perspective. Below is an updated version of the code that successfully prints the checkerboard pattern.

[[See Video to Reveal this Text or Code Snippet]]

Code Breakdown

Creating the Checkerboard:

The line Checkerboard = [["0"] * 8 for i in range(8)] initializes an 8x8 grid filled with 0. This makes use of a list comprehension to create the 2D array.

Filling in the Xs:

The nested for loops iterate through each row (i) and each column (j) of the checkerboard. Using the modulus operator (%), we determine whether to place X based on whether i and j are even or odd.

Printing the Checkerboard:

Finally, the second nested loop is responsible for printing each row of the checkerboard. The end='' keeps the rows on the same line, and print('') is used to move to the next line after each row is printed.

Conclusion

By using careful indexing and logical conditions, you can create a checkerboard pattern in Python without relying on external libraries like Numpy. This exercise not only reinforces your understanding of arrays but also emphasizes the importance of proper indexing in programming.

Feel free to try out the provided code and tweak it as necessary for your own projects. Happy coding!