import numpy as np

source = np.arange(6)
basic_slice = source[1:4]
advanced_index = source[[1, 2, 3]]
isolated_slice = source[1:4].copy()

print("source before:")
print(source)
print()

print("basic_slice shares memory:", np.shares_memory(source, basic_slice))
print("advanced_index shares memory:", np.shares_memory(source, advanced_index))
print("isolated_slice shares memory:", np.shares_memory(source, isolated_slice))
print("basic_slice.base is None:", basic_slice.base is None)
print("advanced_index.base is None:", advanced_index.base is None)
print()

basic_slice[0] = 99
advanced_index[1] = 77
isolated_slice[2] = 55

print("source after edits:")
print(source)
print()
print("basic_slice after edit:")
print(basic_slice)
print()
print("advanced_index after edit:")
print(advanced_index)
print()
print("isolated_slice after edit:")
print(isolated_slice)