Accessing subarrays
Let's access elements in NumPy arrays! Your task is to convert a square two-dimensional array square of size size to a list created by following a spiral pattern:
Rather than simply accessing certain slices, you will define a more general solution using a for loop (the solution should work for all the square two-dimensional arrays of odd size).
The module numpy is already imported as np.
You will need the reversed() function, which reverses an Iterable.
Cet exercice fait partie du cours
<cours>Practicing Coding Interview Questions in Python</cours>Instructions de l’exercice
- Convert each part marked by a red arrow to a list.
- Convert each part marked by a green arrow to a list.
- Convert each part marked by a blue arrow to a list.
- Convert each part marked by a magenta arrow to a list.
Exercice interactif pratique
Essayez cet exercice en complétant ce code d’exemple.
spiral = []
for i in range(0, size):
# Convert each part marked by any red arrow to a list
spiral += list(square[i, ____:____])
# Convert each part marked by any green arrow to a list
spiral += list(square[____:____, size-i-1])
# Convert each part marked by any blue arrow to a list
spiral += list(reversed(square[size-i-1, ____:____]))
# Convert each part marked by any magenta arrow to a list
spiral += list(reversed(square[____:size-i-1, ____]))
print(spiral)