Write test code in: if __name__ ==’__main__’: proving that __getitem__ works for

Question

Write test code in:   if __name__ ==’__main__’:

proving that __getitem__ works for negative indices

# provides low-level arrays import ctypes from time import time class DynamicArray: """A dynamic array class akin to a simplified Python list.""" def _init (self): "" "Create an empty array.""" self. n 0 self. capacity - self. A = self. make array (self. capacity) #count actual elements # default array capacity # low-level array def len (self) """Return number of elements stored in the array.""" return self. n def getitem (self, k): """Return element at index k.""" if k

Explanation / Answer

Here only one def. need to change.

def __getitem__(self, k):

if k < 0:

k = self._n + k // this line will make sure that we pass actual index from beginning for negative index

if not 0 <= k < self.n:

raise IndexError('invalid index')

return self._A[k]

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