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.
本练习是课程的一部分
Practicing Coding Interview Questions in Python
练习说明
- 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.
交互式实操练习
通过完成这段示例代码来试试这个练习。
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)