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Python - Using 2D arrays/lists the right way
Python provides many ways to create 2-dimensional lists/arrays. However, one must know the differences between these ways because they can create complications in code that can be very difficult to trace out.
rows, cols = (5, 5) arr = [*cols]*rows #lets change the first element of the 1st row to 1 & print the array arr = 1 for row in arr: print(row) arr = [[0 for i in range(cols)] for j in range(rows)] #again in this new array lets change the 1st element of the first row # to 1 and print the array arr = 1 for row in arr: print(row)
[1, 0, 0, 0, 0] [1, 0, 0, 0, 0] [1, 0, 0, 0, 0] [1, 0, 0, 0, 0] [1, 0, 0, 0, 0] [1, 0, 0, 0, 0] [0, 0, 0, 0, 0] [0, 0, 0, 0, 0] [0, 0, 0, 0, 0] [0, 0, 0, 0, 0]
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